Los Angeles Solar + Battery Decision Pack
Solar PanelsBattery Storage
What this pack covers
This Decision Pack covers a coordinated Solar Panels and Battery Storage project in Los Angeles, CA.
It assembles cost ranges, incentive eligibility, permit requirements, and the questions to ask before signing a contract. Every dollar figure and incentive shown is dated and sourced.
Your goal in one sentence
Plan a Los Angeles solar plus battery install that takes advantage of LADWP's near-retail net metering (a structurally different and stronger economic story than IOU NEM 3.0), models production with neighborhood-microclimate derate and 3D shading for canyon and foothill addresses, checks RSSE eligibility through LADWP for income-qualified households, sequences LADWP PTO plus LADBS permits through ePlanLA or SolarAPP+ plus seismic anchoring plus CRC R327 / R337 fire setbacks, and is honest about the post-§25D federal credit landscape and the closed LADWP Solar Incentive Program.
Recommended sequence
- Solar Panels — No prerequisites within this pack.
- Battery Storage — No prerequisites within this pack.
Who to contact
| Who | Why | What to ask for |
|---|---|---|
| Solar + battery installer | Models solar production, battery behavior, NEM 3.0 economics, backup loads, and EV charging impact. | Solar scenario, battery scenario, future load model, backup-loads plan, EV charging plan. |
Opening script to send contractors
Hi, I'm in Los Angeles, CA and planning a project that includes Solar Panels, Battery Storage. I am looking for a quote that includes: 1. Solar Panels 2. Battery Storage Please tell me: - Will you perform a formal load calculation (Manual J for HVAC, Article 220 for electrical)? - Are you familiar with Los Angeles permits and any local rebate programs? - Can you give line-item pricing and separate confirmed incentives from assumed incentives? - Who handles permits, inspections, and rebate paperwork?
Technical basics in plain English
Panel size: 100A, 125A, 150A, 200A
Your electrical panel is the main entry point for electricity into your house. The 'A' means amps. More amps means more total electrical capacity. 100A is older and may not support adding heat pump + water heater + EV charger together without an upgrade or smart load management. 125A/150A is middle ground; could work with efficient equipment and a real load calculation. 200A is usually the cleanest path, but not guaranteed.
Ask: What is my panel size, and can you show me the load calculation that proves this setup is safe?
Load calculation
A load calculation is not the same as guessing. It is a code-based calculation that estimates whether your panel and service can safely carry all major electrical loads. A qualified electrician or contractor should be able to explain whether you need a panel upgrade, a service upgrade, or smart load management instead.
Ask: Are you doing a formal electrical load calculation, or just eyeballing the panel?
Smart load management
Smart load management lets devices avoid running at full power at the same time. For example, the EV charger may slow down while the heat pump or water heater is running. This can sometimes avoid an expensive panel or service upgrade.
Ask: Can smart load management avoid a service upgrade while still supporting future loads?
Battery backup: whole-home vs essential-loads
Whole-home backup tries to power almost everything during an outage. Essential-loads backup powers selected circuits (refrigerator, internet, lights, some outlets). Whole-home backup costs more and drains batteries faster. Essential-loads backup is usually more economical.
Ask: Are you quoting whole-home backup or essential-loads backup? Which specific circuits will be backed up?
Specific questions to ask
Questions for solar + battery installers
| Question | Good response | Bad response |
|---|---|---|
| How will you size the solar array for our future electric load (heat pump HVAC, EV, water heater)? | We model expected future usage including planned heat pump, EV miles, and water heater, then size the array to offset that load under NEM 3.0 export economics. | We size the system from last year's utility bill only. |
| How does NEM 3.0 change the economics versus older interconnections? | NEM 3.0 cut export compensation by ~75 percent versus NEM 2.0, which makes battery storage important for self-consumption. We model expected savings under NEM 3.0 specifically. | NEM 3.0 is the same as NEM 2.0 economically. |
| Is my roof suitable for solar, and what is its remaining lifetime? | We inspect the roof condition, slope, orientation, and shade pattern; we recommend roof replacement first if the roof is near end of life. | Any roof works. |
| Which panel and inverter brands do you recommend, and why? | We name the specific panel model (wattage, efficiency, temperature coefficient, degradation curve) and inverter brand (string vs microinverter), explain the tradeoffs for our roof, and provide the manufacturer datasheets. | We use whatever is cheapest in stock this month. |
| Will the array use string inverters, microinverters, or DC optimizers, and why? | We choose based on roof shading patterns and orientation: microinverters or optimizers for shaded or multi-orientation roofs, string inverters for unshaded uniform arrays. We explain the cost and monitoring tradeoff. | Microinverters are always best. |
| What does the shade analysis show for our roof across the year? | We run a shade analysis tool (HelioScope, Aurora, or similar) using a site survey and roof imagery, and we share the annual production estimate per panel with shade losses called out. | Shade is not significant. |
| Do you offer a production guarantee, and how is it enforced? | We offer an annual production guarantee in kWh based on the design model, and we explain the remediation path (true-up payment or system correction) if actual production falls below the threshold. | Production guarantees are a marketing gimmick. |
| What monitoring platform comes with the system, and are there subscription fees? | We name the monitoring platform (Enphase Enlighten, SolarEdge mySolarEdge, or similar), describe what data is visible per panel or per string, and disclose any optional or recurring fees. | Monitoring is included; do not worry about the details. |
| If we add a battery later, can we still apply for SGIP at that time? | Yes — SGIP applications are tied to the battery install, not the solar install. As of 2026, only the AB 209-funded RSSE (Residential Solar and Storage Equity) tier remains open to new applications, and that budget is fully reserved with new apps on a waitlist served via attrition; ratepayer-funded General Market / Equity / Equity Resiliency budgets are no longer accepting new applications. We verify current SGIP budget status at selfgenca.com when the battery is added and explain that pre-approval is required before equipment is delivered. | SGIP only counts if solar and battery are installed together. |
| Who handles the PG&E interconnection paperwork, and what is the typical timeline? | We submit the PG&E interconnection application on your behalf, file the city permits, and coordinate Permission to Operate (PTO). Typical PG&E PTO timelines range from 2 to 6 weeks after the city sign-off; we document the expected window in the quote. | Interconnection happens automatically. |
| What is your post-install commissioning checklist? | Commissioning includes verifying each panel reports correctly in the monitoring platform, checking inverter firmware, confirming production matches the design model on a clear day, and walking us through reading the monitoring app. | We turn it on and leave. |
| How will you confirm the roof structure supports the array? | We perform a structural assessment including rafter sizing, spacing, and condition; for older or unusual roofs we may engage a licensed structural engineer to provide a letter for the permit submittal. | Roofs always handle solar. |
| How will the array meet California fire-setback rules? | We design the array to meet the California Residential Code fire access pathway requirements: ridge setbacks, hip-to-eave pathways, and emergency egress clearances, and we document compliance in the permit submittal. | Fire setbacks are optional. |
| What ongoing maintenance does the system need? | Typical maintenance is light: annual visual inspection, occasional rinse if local dust or pollen reduces production, and inverter firmware updates pushed by the manufacturer. We explain the warranty implications of skipping recommended maintenance. | Solar is install-and-forget; no maintenance ever. |
| What warranties cover the panels, inverter, and labor? | Panels typically carry a 25 year product warranty plus a 25 year linear production warranty; inverters carry 10 to 12 years standard (extendable); we provide a 5 to 10 year labor warranty separately. We document what voids each. | Lifetime warranty on everything. |
| Does NEM 3.0 apply to a rooftop solar install on our LADWP service? | No. NEM 3.0 (the CPUC's Net Billing Tariff) applies to PG&E, SCE, and SDG&E. LADWP is a municipal utility and is not subject to NEM 3.0; LADWP runs its own net metering policy that credits exports at or near the full retail rate, with bill credits typically between $0.22 and $0.37 per kWh depending on tier and season. That makes LADWP solar economics materially better than IOU NEM 3.0 economics for the same roof: payback usually runs 2-3 years faster on LADWP. We confirm your service is LADWP versus SCE before modeling and document the assumption. | All California utilities are on NEM 3.0 now. |
| Is the old LADWP Solar Incentive Program still paying out in 2026? | The LADWP residential Solar Incentive Program ran out of funds in late 2018 and has not reopened broadly for new applications. The LADWP Solar Rooftops program (a separate offering that leased rooftop space to LADWP) was suspended at the start of the COVID-19 pandemic and is working through a backlog. We do not deduct an SIP rebate from your project cost in 2026. The active value path for LA solar is LADWP's favorable net-metering credit at near-retail rates plus possible RSSE (Residential Solar and Storage Equity) eligibility for income-qualified solar-plus-battery customers; we document both honestly. | LADWP has a Solar Incentive Program rebate that pays for half your install. |
| How do you model expected production for our specific LA neighborhood? | We use PVsyst or HelioScope with NREL TMY3 data for the LA-area weather station nearest your address (LAX for west / coastal, Burbank for the Valley, Pasadena for foothills) and apply a microclimate derate where appropriate. We run a 12-month production model with monthly breakdown, sharing it with you. We do not promise specific kWh production; we provide the model and explain the irradiance assumptions, shading inputs, and module-level performance assumptions. Production typically runs 15-20 percent above SF for the same roof, with Valley addresses at the high end and June marine-layer-heavy coastal addresses at the low end. | LA is sunny so production is whatever the panels say. |
| We are income-qualified. Can RSSE help fund the solar plus battery install? | Yes, possibly. RSSE (Residential Solar and Storage Equity, the AB 209 program) is administered by LADWP for City of LA customers and requires that the system include both solar and energy storage, or that you have an existing solar system and add a battery placed in self-consumption mode. Income eligibility is at or below 80 percent of Area Median Income, or enrollment in CARE, FERA, or ESA. As of February 2026 the program is fully reserved but accepting waitlist applications via sgip@ladwp.com. We apply on your behalf, document the waitlist position, and confirm we are not promising a payout that is not yet committed. | RSSE pays for your whole solar plus battery; sign up after install. |
| Our LA Spanish-tile roof is 18 years old. Should we re-roof first? | Solar arrays typically have a 25-year production warranty; if your roof has fewer than 7-10 years of remaining life it usually makes sense to re-roof first to avoid R&R (remove and reinstall) the array later, which costs $2,000-$5,000+ depending on system size. Spanish tile complicates the math: tile-hook attachments are well-understood but tile breakage during install runs 3-7 percent, and re-roofing tile is expensive. We assess at the site visit, share the math on re-roof first versus install now, and let you decide. | Old roofs are fine; we'll work around it. |
| Do older LA Craftsman and Spanish homes need a structural review for the array attachment? | Often yes. Older LA single-family homes (1920s-1950s Craftsman, Spanish, mid-century) may have rafter dimensions or spacing that fall outside SolarAPP+'s standard structural assumptions. LADBS may require a stamped structural engineering review with PSI-tested tie-down details. We assess at the site visit, identify whether structural is required, and itemize the engineering scope separately. We do not bury structural fees in the array price. | Old homes never need a structural review; the panels are light. |
| Our home is in the LA hills WUI zone. How does CRC R337 affect the array layout? | For homes in CAL FIRE Very High FHSZ (Hollywood Hills, Brentwood, Bel Air, Pacific Palisades, Topanga, etc.), CRC R337 governs wildfire-resistant construction. The array layout follows California Fire Code roof-access pathway requirements: a 3-foot setback at ridges and a 3-foot pathway from the eave on a residential roof, with specific exemptions for steep slopes. The panels themselves are Class A fire-rated; conduit penetrations use fire-rated boots; combiner boxes near eaves need ignition-resistant placement. We document the FHSZ designation, the setbacks, and the rated hardware in the permit drawings. | Fire rules do not change solar installs in LA. |
| How does the LA seismic environment affect array mounting and racking choice? | The LA seismic design category is high (Sds in the 1.0-1.5g range for most of the basin). Racking manufacturers publish seismic certifications (UL 2703 plus IBC engineering); we select racking with the appropriate seismic rating, set attachment density per the manufacturer engineering for your rafter geometry, and document the structural calculations in the permit set. Composition-shingle attachments use lag screws into rafters; tile-roof uses tile-hooks with rafter-pinned baseplates. We do not use spec-only fasteners or shortcut attachments. | Seismic does not matter for solar; the array is light. |
| Which inverter topology do you recommend for our LA install: microinverter or string? | Common choices: Enphase IQ8 microinverters (panel-level MPPT, rapid shutdown built-in, 25-year warranty, easier later expansion, premium price), or SolarEdge string inverter with power optimizers (panel-level optimization at lower per-watt price than micros, 12-year inverter warranty extendable to 20-25). For complex LA roofs (multiple orientations, partial shade from neighbor trees, dormer geometry on Spanish or Craftsman roofs) microinverters typically win. For simple single-azimuth large roofs, SolarEdge string usually has the better $/W. We model both and share the cost-benefit. Federal 25D being expired does not change which topology is right; the math now favors slightly lower-cost topologies. | Microinverters are always better; that is the only option. |
| Our home is in a canyon with mature trees. How do you handle shading in the production model? | We do a 3D shading analysis using HelioScope or Aurora with on-site measurements (Suneye or similar) for trees and adjacent structures. Hollywood Hills, Beachwood Canyon, Topanga, and many San Gabriel Foothills properties have meaningful winter shading from mature oaks, eucalyptus, or neighbor structures. The model shows per-month derate and which roof faces are affected. If panel-level mismatch is severe we recommend microinverters or optimizers; if shading is heavy on one face we re-scope the array. We share the shading inputs and the production output. | Shading is fine; modern panels handle it. |
| How do NEC 690 and 705 affect the design and how is rapid shutdown handled? | NEC 690 governs PV system design (conductor sizing, overcurrent protection, equipment listing); NEC 705 governs interconnection (the 120 percent busbar rule for back-fed inverter breakers). For a typical LA install on a 200A panel with a 40A back-fed inverter breaker, we verify 200 + 40 = 240A is under 120 percent of 200 = 240A (right at the limit; we document the calc). Rapid shutdown follows NEC 690.12 with module-level shutdown at the panel for Enphase or SolarEdge platforms. We document the calc, the rapid-shutdown method, and the labeling per NEC 690.56 in the permit set. | NEC compliance is the inspector's problem. |
| What monitoring and commissioning do we get at the end of the install? | Monitoring is the Enphase Enlighten app (panel-level), SolarEdge mySolarEdge (string + optimizer-level), or the inverter manufacturer's platform. We register your account, set up alerts for production faults or under-performance, and confirm the gateway communicates with the cloud before leaving. The commissioning report includes the as-built single-line diagram, the actual production at sunrise / midday / sunset on a clear day, the inverter firmware version, and the LADWP PTO confirmation. We share the report. | Monitoring is optional; you can set it up yourself. |
| What is the warranty stack for the panels, inverter, racking, and labor? | Typical warranties: panels 25 years (production guarantee, declining linearly to ~85 percent of nameplate), microinverters 25 years (Enphase IQ8) or string inverters 12 years extendable to 20-25 (SolarEdge), racking 20 years (UL 2703 platforms), labor 5-10 years (varies by installer). We list each warranty line in the proposal: who provides it, what triggers it, what is excluded (typically acts of God, vandalism, salt-air corrosion in some warranties). We register on your behalf and share confirmation. | Warranties are all 25 years; do not worry about the details. |
| We are planning a heat pump and EV charger in the next 2 years. Should we oversize the array now? | Probably yes. Adding heat pump HVAC, HPWH, and EV charging typically grows annual load by 4,000-8,000 kWh; sizing the array for that future load now costs slightly more incrementally and avoids a second LADBS permit cycle plus a second LADWP PTO. We use your current 12 months of LADWP bill data plus modeled future loads from Manual J and EV mileage, then size the array to that target. LADWP's net-metering credit is favorable, so slightly oversized arrays generally make financial sense in LA. We share the load model. | Always undersize and add later. |
| If we re-roof and install solar together, who coordinates LADBS permits and warranty? | We coordinate or partner with a roofer on a single project schedule: roof replacement first, then solar mount and electrical, with LADBS issuing separate permits for the roofing (typically Express) and the solar electrical (ePlanLA or SolarAPP+). Warranty handoff matters: the roofer warrants the underlayment and the roofing; we warrant the array attachment and the electrical. We document the boundary in writing so a leak in year 5 has a clear owner. We do not blur the warranty boundary. | We do everything; warranty is one phone call. |
| What is the LADWP solar interconnection application process and fee? | LADWP's interconnection application for residential PV under 30 kW is submitted online via ladwp.com after permit issuance. The application includes the single-line diagram, the inverter spec sheet, the array layout, the Class A roof confirmation if in a WUI zone, and the building permit number. An application fee applies (we list the current LADWP rate at quote time); the interconnection agreement is signed before LADWP authorizes meter-side commissioning. We submit on your behalf, share the application number, and track to PTO. We do not energize the system before PTO. | Just flip the breaker once the inspector signs off; LADWP figures it out. |
| Which circuits will be backed up during an outage, and for how long? | We provide a backup-loads list (refrigerator, internet, lights, HVAC controls, well pump if any), estimate runtime in hours at typical and worst-case usage, and explain whether whole-home or essential-loads backup is recommended. | The battery powers the house. |
| Does my install qualify for SGIP (Self-Generation Incentive Program), and at what tier? | We verify current SGIP budget status before quoting: as of December 31, 2025 the ratepayer-funded General Market, Equity, and Equity Resiliency budgets are closed to new applications, and only the AB 209-funded RSSE (Residential Solar and Storage Equity) tier remains open — and that budget is fully reserved with new applications served via an attrition-based waitlist (selfgenca.com). We document the waitlist position rather than promising a rebate, and we explain that pre-approval is required before equipment is delivered. | SGIP always pays out the maximum amount. |
| What is the battery's usable kWh and continuous inverter power, and how do they relate? | We specify both: kWh determines how long the backup lasts; the inverter's continuous AC output determines what can run at once (refrigerator + lights + maybe HVAC vs everything). | kWh is the only number that matters. |
| Is the battery AC-coupled or DC-coupled with the solar array, and why? | AC-coupled batteries use a separate inverter and are easier to retrofit to existing solar. DC-coupled batteries share an inverter with new solar and are typically more efficient end-to-end. We choose based on whether the solar array is new or existing. | Coupling does not matter. |
| Can we add more battery capacity later, and what are the limits? | Most modern systems support stacking additional units up to a vendor-specified maximum. We document the maximum stack today, what is needed to add capacity later (matching firmware, software update, possible electrical re-work), and whether SGIP can be applied to expansion units. | Buy the biggest battery today; expansion is impossible. |
| What depth-of-discharge limit does the battery use, and how does that affect usable kWh? | We explain the nameplate kWh vs usable kWh: modern LFP batteries reserve very little for cycle life (often 95 to 100 percent of nameplate is usable); older chemistries reserve 10 to 20 percent. We quote usable kWh in the proposal so you can compare like-for-like. | Nameplate kWh is the usable kWh. |
| What is the manufacturer warranty on the battery, and what limits it? | Most residential batteries carry a 10 to 12 year warranty, often paired with a cycle count (e.g. 6,000 to 10,000 cycles) or throughput limit (e.g. 37.8 MWh) - whichever comes first. We provide the spec sheet and explain what voids coverage. | Lifetime warranty; no fine print. |
| Are time-of-use arbitrage cycles counted against the warranty? | Yes. Every charge-discharge cycle counts toward the throughput limit; aggressive daily TOU arbitrage may shorten the years-based warranty window. We model expected cycles per year for your usage pattern. | Cycling does not count against the warranty. |
| How will the battery shift load away from PG&E peak hours? | We program the battery to charge from solar during midday and discharge during the PG&E EV2-A or E-ELEC peak window (typically 4-9pm), saving you the peak-period delta. We tune the schedule for your actual usage and rate plan. | The battery charges and discharges whenever. |
| How does NEM 3.0 change the battery payback? | Under NEM 3.0, export compensation dropped by roughly 75 percent, so self-consumption (using your solar via the battery instead of exporting) is now the primary battery economic driver. We model expected savings under NEM 3.0 with your specific rate plan. | NEM 3.0 has no effect on battery payback. |
| How will the install meet CRC 1207 / R327 fire-setback rules for energy storage? | We design the install per California Residential Code R327 (formerly section 1207): separation from windows, doors, openings into the dwelling, and other batteries; smoke and heat detectors per code; and an exterior wall location where possible. We document compliance in the permit submittal. | Fire setbacks are optional. |
| What is your post-install commissioning checklist? | Commissioning includes verifying battery state-of-charge reporting, testing backup-mode transfer with a simulated outage, walking through the app for backup-only vs TOU modes, and confirming the SGIP system performance metering is functioning if SGIP is part of the project. | We turn it on and leave. |
| Are you an installer certified by the battery manufacturer? | Yes. We provide our certification number for the specific battery brand (Tesla Powerwall, Enphase IQ, LG Chem RESU, FranklinWH, etc.); certification is typically required to preserve full warranty coverage. | Certification does not matter for batteries. |
| Who handles the PG&E interconnection update for the new battery? | We submit the updated PG&E interconnection paperwork to add the battery to your existing or new solar interconnection, and we obtain the updated Permission to Operate before energizing. | PG&E interconnection happens automatically. |
| What panel-side breaker work or interconnection method does the battery require? | We confirm whether the battery interconnects via a back-fed breaker (with sum-of-breakers check per NEC 705.12), a supply-side tap, or a dedicated battery sub-panel; we show the calculation on the permit drawings. | Any spare slot will work. |
| Does SGIP apply for a battery install on LADWP? | Statewide SGIP General Market, Equity, and Equity Resiliency budgets do not apply to LADWP customers; those budgets are CPUC-administered and ratepayer-funded by IOUs (PG&E, SCE, SDG&E, SoCalGas). LADWP runs its own SGIP-equivalent: the Residential Solar and Storage Equity (RSSE, AB 209) program for income-qualified solar plus battery customers, administered through sgip@ladwp.com. As of February 2026 RSSE is fully reserved but accepting waitlist applications. For non-income-qualified LADWP customers there is no comparable statewide-tier general market rebate. We do not promise SGIP payouts that do not apply on LADWP. | Statewide SGIP pays for batteries; sign up after install. |
| Does a battery actually improve payback under LADWP net metering, the way it does on PG&E NEM 3.0? | The economics are different. Under LADWP's near-retail net metering, exported solar already earns close to retail credit, so the self-consumption benefit of a battery is much smaller than under PG&E NEM 3.0 (where exports earn roughly 75 percent less). The case for a battery in LA is more about backup resilience (Santa Ana wind events, PSPS in some hillside neighborhoods, planned LADWP outages for system work) than about bill arbitrage. We model both bill impact and outage resilience and let you decide. We do not pretend the bill savings justify the battery; that math is honest on PG&E and weaker on LADWP. | Adding a battery always cuts your LADWP bill in half. |
| What backup loads should we plan for in an LA outage? | Typical LA residential backup-loads: refrigerator (continuous 100-200W average, 800W startup), interior lighting (LED 50-150W total), Wi-Fi and router (20-30W), TV plus AV (100-200W), phone and laptop charging (50W), and during summer at least one window or mini-split for cooling load (a 1-ton mini-split runs 800-1500W). For Santa Ana wind events or planned LADWP outages running 6-12 hours, a 13.5 kWh battery covers everyday backup; for 24-hour outages with cooling we typically recommend 27 kWh or solar plus battery to recharge mid-day. We size from your specific list, not a generic load. | 13.5 kWh works for everyone in LA. |
| Our wall-mount battery is heavy. How is it seismically anchored in our LA Spanish house? | A Tesla Powerwall 3 weighs about 290 pounds; Enphase IQ Battery 5P weighs about 165 pounds; FranklinWH aPower 2 is about 350 pounds. CBC seismic detailing requires anchoring to structural framing (wood studs, masonry, or concrete) using the manufacturer's published seismic anchor schedule. For LA Spanish stucco-on-wood we drill through stucco into studs with the manufacturer's specified lag size and pattern; for masonry walls we use expansion anchors rated for the seismic load. We include the structural detail in the LADBS permit set. We do not anchor to drywall. | Just hang it on the wall; the wall holds. |
| Our home is on a Hollywood Hills WUI lot. Does CRC R327 affect where the battery goes? | Yes, multiple rules interact. CRC R327 (statewide ESS rules) requires battery siting setbacks from openings, exit pathways, and combustible construction; CRC R337 (WUI zones) adds wildfire-rated construction requirements for adjacent assemblies. Garage installs adjacent to a habitable space need fire-rated separation. Outdoor wall mounts on WUI lots need ignition-resistant placement. We verify the FHSZ designation, walk through the setback measurements on-site, and document everything in the permit set. We do not install the battery in a marginal location and hope it passes inspection. | Just bolt it to the wall; LADBS does not check ESS setbacks closely. |
| Can the battery shift LADWP TOU-charged loads to save on the bill? | For LADWP R-1B TOU customers, a battery can charge during the Base period (8pm-10am weekdays, all weekend) and discharge during High Peak (weekdays 1pm-5pm) and Low Peak (10am-1pm and 5pm-8pm) windows. The arbitrage value is the rate spread between Base and High Peak. We model this against your usage and share the year-1 estimate. For most LA residential homes the arbitrage value is modest (typically a few dollars per month per kWh of battery capacity) because LADWP rate spreads are narrower than PG&E TOU spreads. The case is still primarily resilience, not arbitrage. | Battery pays for itself in 2 years on LADWP TOU. |
| Should we back up the whole house or use a critical-loads sub-panel? | Three options: whole-house backup (battery and inverter sized to carry total connected load including AC compressors and EV charging during outage, more expensive), critical-loads sub-panel (a separate sub-panel with only essential circuits backed up, lower battery capacity needed), or smart-panel-style load management (Span, Lumin, or Schneider Square D Energy Center that disable non-critical loads automatically during outage). For LA homes with central AC, whole-house typically requires 2-3 batteries; critical-loads with a smart-panel typically works with one. We model each and share the cost-benefit. | Whole-house backup is always the right answer. |
| Which battery brands do you install in LA and what are the tradeoffs? | Common 2026 LA installs: Tesla Powerwall 3 (13.5 kWh usable, integrated inverter, supports up to 4 units, AC-coupled with optional DC), Enphase IQ Battery 5P (5 kWh per unit, modular, AC-coupled, pairs with IQ8 microinverters), FranklinWH aPower 2 (15 kWh usable, integrated, often less expensive per kWh), LG Energy Solution RESU PRIME (DC-coupled, paired with compatible inverter). We compare on: usable capacity per dollar, warranty terms (cycles plus throughput), local service availability in LA, monitoring app quality, and compatibility with your existing or planned solar inverter. We do not push one brand; we share the comparison. | Tesla Powerwall is the only option worth considering. |
| Should the battery be AC-coupled or DC-coupled to the solar? | AC-coupled (Tesla Powerwall 3, Enphase 5P, FranklinWH) has its own integrated inverter, works with any existing solar inverter, and is the typical retrofit path. DC-coupled (LG RESU PRIME with SolarEdge or Sol-Ark hybrid inverter) shares the solar inverter and is slightly more efficient when round-tripping solar through the battery, useful for new solar plus battery installs being designed together. For a retrofit on existing solar, AC-coupled almost always wins on cost and simplicity. For a new install, we model both. We document the topology choice and the inverter compatibility in the proposal. | DC-coupled is always the right choice. |
| What UL certifications matter and why? | UL 9540 covers ESS as a system (battery plus inverter plus controls); UL 9540A is the thermal-runaway propagation test that verifies a single-cell failure does not cascade into adjacent units. For LA installs (CRC R327 plus CFC requirements) UL 9540 listing is required and UL 9540A test data informs the setback distances in the permit. We list both certifications in the proposal and provide the cell-pack test data when LADBS requests it for hillside or attached-garage installs. We do not install non-listed equipment. | UL listing is just a sticker; nobody checks. |
| What battery warranty terms should we look at? | Battery warranties have three dimensions: years (typically 10), cycles (typically 5,000-10,000), and throughput (typically 27-40 MWh total energy passed through). Whichever limit is hit first ends the warranty. Tesla Powerwall 3 is 10 years and unlimited cycles for daily use, 70 percent capacity retention; Enphase IQ Battery 5P is 15 years and 6,000 cycles, 60 percent retention; FranklinWH aPower 2 is 15 years and 12,000 cycles. We list each warranty's three dimensions in the proposal, register on your behalf, and share confirmation. We do not let 'warranty' marketing copy substitute for the actual terms. | Warranty is 10 years; that's all you need to know. |
| What monitoring and commissioning do we get? | Monitoring is the brand app (Tesla app, Enphase Enlighten, FranklinWH app, etc.). We register your account, set up outage and low-SOC alerts, confirm the gateway communicates with the cloud, and walk through the app together. Commissioning includes a backup-test (simulate grid outage by opening the main breaker, confirm battery picks up critical loads within the inverter's transfer time, typically 200-500 ms), state-of-charge verification, and a signed commissioning sheet with measured values. Without commissioning the battery may not transfer cleanly during a real outage. The LADBS inspection card is separate from the commissioning sheet. | Push the button at the end; you don't need a backup test. |
| Can a battery work with LADWP Virtual Net Metering on a multifamily property? | LADWP Virtual Net Metering for multifamily property covers the solar export allocation across tenant meters. Adding a battery to a VNM-property complicates the interconnection: the battery's discharge timing affects which meter sees the credit. We confirm LADWP's current VNM-plus-storage rules at quote time (the program has been evolving) and document the configuration. For most single-family LA homes this is not a question; for duplex / triplex / fourplex property owners adding both solar and battery, we walk through the metering implications carefully. | VNM plus battery just works; LADWP figures it out. |
Questions for electricians
| Question | Good response | Bad response |
|---|---|---|
| How do NEC 706 and 705 apply to the battery interconnection? | NEC Article 706 covers ESS installations (disconnects, overcurrent protection, signage, working clearances). NEC 705.12 covers parallel-source interconnection: for a battery plus solar plus utility on the same busbar, we verify the 120 percent busbar rule, or use a supply-side tap if 120 percent fails. For LADWP service, the disconnect must be accessible to the utility and labeled per LADWP service-rule conventions. We document each NEC citation in the permit set. We do not short-circuit the calc to make it 'fit'. | NEC compliance is the inspector's problem. |
| How do you handle grounding for the battery in an older LA house? | NEC Article 250 requires the ESS to be bonded to the existing grounding electrode system. Older LA Spanish, Craftsman, and bungalow homes sometimes have only a single ground rod, an undersized water-pipe bond, or both; the existing system may not meet current code for a new ESS. We measure the existing grounding electrode resistance, document compliance, and add supplemental electrodes (typically a second 8-foot copper-clad rod 6 feet from the first) if required. We include the grounding work as a line item in the proposal. | Just bond it to the panel; that's enough. |
General questions for every contractor
| Question | Good response | Bad response |
|---|---|---|
| Does the federal Section 25D residential clean energy credit apply to my installation? | Section 25D expired December 31, 2025 under the One Big Beautiful Bill Act (Public Law 119-21). Installations completed in 2026 or later do not qualify for the 30 percent §25D credit. | You will receive the 30 percent federal credit on your taxes. |
| Does TECH Clean California currently offer a solar incentive? | TECH Clean California primarily targets heat pump HVAC and heat pump water heaters, not standalone solar. We verify current TECH program scope at techcleanca.com before citing any incentive. | TECH covers solar; assume the rebate applies. |
| Are BayREN Home+ rebates available for our solar or solar plus battery project? | BayREN Home+ is primarily a building shell and heat-pump program for Bay Area homeowners; we verify whether a solar or battery incentive is currently active at bayren.org and explain the application path if so. | BayREN always pays out for solar. |
| What is the best next step before signing a solar contract? | Get a written quote with line-item pricing including the design model output (kWh per year), shade analysis, panel and inverter make and model, permit and PG&E interconnection fees, production guarantee terms, and warranty terms. | Sign today to lock in pricing before incentives change. |
| How does the LADBS solar permit and PTO process work in LA? | We pull the LADBS electrical permit through ePlanLA, plus a structural review for the array attachment if required by the rafter geometry or roofing material. LADBS participates in SolarAPP+ for streamlined permitting on qualifying standard residential designs; we use it when eligible (typically same-day issuance versus 2-6 weeks for full plan check). Permission to Operate (PTO) from LADWP typically takes 2-6 weeks after final inspection, sometimes longer in heavy queue periods. We share all permit applications, the inspection schedule, and the LADWP interconnection paperwork with you. | LADBS solar permits are same-day issued always; no plan check needed. |
| Can we still claim the federal 25D residential solar credit? | The federal Residential Clean Energy Credit (Section 25D, the 30 percent solar tax credit) expired December 31, 2025 under the One Big Beautiful Bill Act (OBBBA, PL 119-21). Systems placed in service in 2026 or later are not eligible. We list the credit as expired in the proposal and do not deduct it from your project cost. The post-§25D LA solar payback story still works because LADWP's near-retail net metering credit is the strongest in California, but we model honestly without the federal credit. | The 30 percent solar tax credit is still in effect; just claim it on your taxes. |
| How does Title 24 and the 2022 California Building Code apply to a retrofit solar install? | The Title 24 Solar Mandate (Section 150.1) requires PV on new residential construction. For a retrofit on an existing home, the mandate does not directly apply. The 2022 California Residential Code (Chapter 11) governs the structural attachment, fire setback, and roof-access pathway requirements. We design to the 2022 CRC and document the path in the LADBS permit set. If you are doing an addition or major remodel, the Title 24 retrofit-triggers rules can come into play; we identify that at the site visit. | Title 24 forces PV on all retrofits. |
| We own an LA duplex or fourplex. Can solar credits split among tenants? | LADWP's Virtual Net Metering (VNM) program lets a single solar array on a multifamily property credit production across multiple LADWP meters (tenant units) proportional to a published allocation table. The property owner installs and owns the array; tenant credits show up on each tenant LADWP bill. This is a different program from single-family net metering and requires specific permit and interconnection paperwork. We confirm VNM availability at your address, identify the meter setup, and document the allocation table you choose. | Solar credits cannot be split among tenants. |
| Does the federal Section 25D residential clean energy credit apply to my battery install? | Section 25D expired December 31, 2025 under the One Big Beautiful Bill Act (Public Law 119-21). Battery installations completed in 2026 or later do not qualify for the 30 percent §25D credit. | You will receive the 30 percent federal credit on your taxes. |
| Does HEEHRA or TECH Clean California currently offer a battery incentive? | Neither HEEHRA nor TECH primarily fund residential batteries; SGIP is the main California battery program. We verify current TECH scope at techcleanca.com and HEEHRA status at energy.ca.gov before citing any battery incentive. | HEEHRA covers batteries automatically. |
| Will the quote separate confirmed SGIP incentives from assumed? | Yes. SGIP is marked confirmed only after pre-approval is granted and the funding tier is reserved; we mark the line as assumed in the quote until then and explain the reservation status. | All listed incentives are yours. |
| What is the best next step before signing a battery contract? | Get a written quote with line-item pricing including usable kWh, continuous AC inverter output, AC vs DC coupling, manufacturer warranty terms (years AND cycles AND throughput), labor warranty separately, SJPermits.org permit fees, PG&E interconnection plan, and an honest SGIP workflow: as of December 31, 2025 only the AB 209-funded RSSE budget accepts new applications and it is fully reserved (attrition-based waitlist via selfgenca.com), so the proposal documents the waitlist position rather than promising a rebate. | Sign today to lock in SGIP before funding runs out. |
| What does the LADBS permit process look like for a battery install? | We pull a LADBS electrical permit through ePlanLA for the battery and its interconnection. For wall-mounted batteries we also document the structural attachment per the manufacturer install manual, including the LA seismic anchor schedule. Fire setback per CRC R327 (statewide) and any WUI-zone enhancements from R337 apply to outdoor or garage installs adjacent to combustible construction. We document the setback measurements on the permit drawings. Final card sign-off happens at the LADBS inspection. We share all permit copies. | Batteries under 20 kWh do not need a permit in LA. |
| Can we claim the federal 25D credit on the battery? | The federal Residential Clean Energy Credit (Section 25D, 30 percent) expired December 31, 2025 under the One Big Beautiful Bill Act (OBBBA, PL 119-21). Standalone battery (installed without solar) or solar-plus-battery installs placed in service in 2026 or later are not eligible. We list the credit as expired in the proposal and do not deduct it from your project cost. For LADWP customers, this is meaningful because the LADWP economic story for a battery without 25D is weaker than under prior law; we present the post-25D math honestly. | 25D is still 30 percent; deduct it from the quote. |
| How do Santa Ana winds and LADWP outages compare to PG&E PSPS for sizing the battery? | LADWP does not run PSPS the way PG&E does in the East Bay and rural Sierra foothills; LADWP is largely underground in many neighborhoods and Santa Ana wind events affect overhead lines mostly in the foothills. That said, LADWP does occasionally plan equipment outages and Santa Ana events can knock out service for 4-24 hours in the hills. We size for that risk window based on your address and your tolerance: 13.5 kWh for short outages, 27 kWh or more for longer events with cooling load. We do not size for a hypothetical week-long event unless you specifically want that resilience tier. | LADWP never has outages; you don't need backup. |
| What is the best next step before signing an LA battery contract? | Schedule a site visit, confirm your LADWP service (and not SCE), decide on the backup-loads list and battery sizing, run the LADWP TOU bill-impact and outage-resilience models, and — if income-qualified — check LADWP's RSSE (AB 209-funded Residential Solar and Storage Equity, sgip@ladwp.com) eligibility honestly: as of December 31, 2025 RSSE is fully reserved and accepting only waitlist applications via attrition. Statewide SGIP General Market / Equity / Equity Resiliency budgets do not apply to LADWP customers and are themselves closed to new apps. Get a written quote with line-item pricing: battery hardware, inverter, gateway, installation labor, LADBS permits, structural attachment, monitoring setup. Compare two or three bids on the same scope and battery brand. We do not pressure you to sign on the first call. | Sign today; LADWP rebates run out tomorrow. |
| Will the LADBS permit fee, structural review, and rebate paperwork all show up itemized in the proposal? | Yes. The proposal itemizes: LADBS electrical permit fee (typically $200-$500 depending on system size after the June 9, 2026 GPMS surcharge increase from 7 to 10 percent), structural review if required (typically $500-$1,500), RSSE rebate paperwork submission as a labor line if eligible, LADWP interconnection application fee, and any monitoring setup labor. We do not bundle these into 'labor' as a lump sum. Bundling is how installers hide the actual rebate value pass-through. | Permits are bundled; do not worry about the breakdown. |
Good vs reasonable vs bad answers
| Question | Good | Reasonable | Bad |
|---|---|---|---|
| How will you size the solar array for our future electric load (heat pump HVAC, EV, water heater)? | We model expected future usage including planned heat pump, EV miles, and water heater, then size the array to offset that load under NEM 3.0 export economics. | — | We size the system from last year's utility bill only. |
| How does NEM 3.0 change the economics versus older interconnections? | NEM 3.0 cut export compensation by ~75 percent versus NEM 2.0, which makes battery storage important for self-consumption. We model expected savings under NEM 3.0 specifically. | — | NEM 3.0 is the same as NEM 2.0 economically. |
| Is my roof suitable for solar, and what is its remaining lifetime? | We inspect the roof condition, slope, orientation, and shade pattern; we recommend roof replacement first if the roof is near end of life. | — | Any roof works. |
| Which panel and inverter brands do you recommend, and why? | We name the specific panel model (wattage, efficiency, temperature coefficient, degradation curve) and inverter brand (string vs microinverter), explain the tradeoffs for our roof, and provide the manufacturer datasheets. | — | We use whatever is cheapest in stock this month. |
| Will the array use string inverters, microinverters, or DC optimizers, and why? | We choose based on roof shading patterns and orientation: microinverters or optimizers for shaded or multi-orientation roofs, string inverters for unshaded uniform arrays. We explain the cost and monitoring tradeoff. | — | Microinverters are always best. |
| What does the shade analysis show for our roof across the year? | We run a shade analysis tool (HelioScope, Aurora, or similar) using a site survey and roof imagery, and we share the annual production estimate per panel with shade losses called out. | — | Shade is not significant. |
| Do you offer a production guarantee, and how is it enforced? | We offer an annual production guarantee in kWh based on the design model, and we explain the remediation path (true-up payment or system correction) if actual production falls below the threshold. | — | Production guarantees are a marketing gimmick. |
| What monitoring platform comes with the system, and are there subscription fees? | We name the monitoring platform (Enphase Enlighten, SolarEdge mySolarEdge, or similar), describe what data is visible per panel or per string, and disclose any optional or recurring fees. | — | Monitoring is included; do not worry about the details. |
| If we add a battery later, can we still apply for SGIP at that time? | Yes — SGIP applications are tied to the battery install, not the solar install. As of 2026, only the AB 209-funded RSSE (Residential Solar and Storage Equity) tier remains open to new applications, and that budget is fully reserved with new apps on a waitlist served via attrition; ratepayer-funded General Market / Equity / Equity Resiliency budgets are no longer accepting new applications. We verify current SGIP budget status at selfgenca.com when the battery is added and explain that pre-approval is required before equipment is delivered. | — | SGIP only counts if solar and battery are installed together. |
| Does the federal Section 25D residential clean energy credit apply to my installation? | Section 25D expired December 31, 2025 under the One Big Beautiful Bill Act (Public Law 119-21). Installations completed in 2026 or later do not qualify for the 30 percent §25D credit. | — | You will receive the 30 percent federal credit on your taxes. |
| Does TECH Clean California currently offer a solar incentive? | TECH Clean California primarily targets heat pump HVAC and heat pump water heaters, not standalone solar. We verify current TECH program scope at techcleanca.com before citing any incentive. | — | TECH covers solar; assume the rebate applies. |
| Are BayREN Home+ rebates available for our solar or solar plus battery project? | BayREN Home+ is primarily a building shell and heat-pump program for Bay Area homeowners; we verify whether a solar or battery incentive is currently active at bayren.org and explain the application path if so. | — | BayREN always pays out for solar. |
| Who handles the PG&E interconnection paperwork, and what is the typical timeline? | We submit the PG&E interconnection application on your behalf, file the city permits, and coordinate Permission to Operate (PTO). Typical PG&E PTO timelines range from 2 to 6 weeks after the city sign-off; we document the expected window in the quote. | — | Interconnection happens automatically. |
| What is your post-install commissioning checklist? | Commissioning includes verifying each panel reports correctly in the monitoring platform, checking inverter firmware, confirming production matches the design model on a clear day, and walking us through reading the monitoring app. | — | We turn it on and leave. |
| How will you confirm the roof structure supports the array? | We perform a structural assessment including rafter sizing, spacing, and condition; for older or unusual roofs we may engage a licensed structural engineer to provide a letter for the permit submittal. | — | Roofs always handle solar. |
| How will the array meet California fire-setback rules? | We design the array to meet the California Residential Code fire access pathway requirements: ridge setbacks, hip-to-eave pathways, and emergency egress clearances, and we document compliance in the permit submittal. | — | Fire setbacks are optional. |
| What ongoing maintenance does the system need? | Typical maintenance is light: annual visual inspection, occasional rinse if local dust or pollen reduces production, and inverter firmware updates pushed by the manufacturer. We explain the warranty implications of skipping recommended maintenance. | — | Solar is install-and-forget; no maintenance ever. |
| What warranties cover the panels, inverter, and labor? | Panels typically carry a 25 year product warranty plus a 25 year linear production warranty; inverters carry 10 to 12 years standard (extendable); we provide a 5 to 10 year labor warranty separately. We document what voids each. | — | Lifetime warranty on everything. |
| What is the best next step before signing a solar contract? | Get a written quote with line-item pricing including the design model output (kWh per year), shade analysis, panel and inverter make and model, permit and PG&E interconnection fees, production guarantee terms, and warranty terms. | — | Sign today to lock in pricing before incentives change. |
| Does NEM 3.0 apply to a rooftop solar install on our LADWP service? | No. NEM 3.0 (the CPUC's Net Billing Tariff) applies to PG&E, SCE, and SDG&E. LADWP is a municipal utility and is not subject to NEM 3.0; LADWP runs its own net metering policy that credits exports at or near the full retail rate, with bill credits typically between $0.22 and $0.37 per kWh depending on tier and season. That makes LADWP solar economics materially better than IOU NEM 3.0 economics for the same roof: payback usually runs 2-3 years faster on LADWP. We confirm your service is LADWP versus SCE before modeling and document the assumption. | LADWP is not on NEM 3.0; LADWP net metering credits exports near retail. We confirm your service is LADWP and model accordingly. | All California utilities are on NEM 3.0 now. |
| Is the old LADWP Solar Incentive Program still paying out in 2026? | The LADWP residential Solar Incentive Program ran out of funds in late 2018 and has not reopened broadly for new applications. The LADWP Solar Rooftops program (a separate offering that leased rooftop space to LADWP) was suspended at the start of the COVID-19 pandemic and is working through a backlog. We do not deduct an SIP rebate from your project cost in 2026. The active value path for LA solar is LADWP's favorable net-metering credit at near-retail rates plus possible RSSE (Residential Solar and Storage Equity) eligibility for income-qualified solar-plus-battery customers; we document both honestly. | The LADWP SIP rebate is closed; the value path is LADWP net metering plus possible RSSE for income-qualified solar plus battery. We do not deduct SIP. | LADWP has a Solar Incentive Program rebate that pays for half your install. |
| How do you model expected production for our specific LA neighborhood? | We use PVsyst or HelioScope with NREL TMY3 data for the LA-area weather station nearest your address (LAX for west / coastal, Burbank for the Valley, Pasadena for foothills) and apply a microclimate derate where appropriate. We run a 12-month production model with monthly breakdown, sharing it with you. We do not promise specific kWh production; we provide the model and explain the irradiance assumptions, shading inputs, and module-level performance assumptions. Production typically runs 15-20 percent above SF for the same roof, with Valley addresses at the high end and June marine-layer-heavy coastal addresses at the low end. | We model production per neighborhood and share the report; LA typically runs 15-20 percent above SF for the same roof. | LA is sunny so production is whatever the panels say. |
| How does the LADBS solar permit and PTO process work in LA? | We pull the LADBS electrical permit through ePlanLA, plus a structural review for the array attachment if required by the rafter geometry or roofing material. LADBS participates in SolarAPP+ for streamlined permitting on qualifying standard residential designs; we use it when eligible (typically same-day issuance versus 2-6 weeks for full plan check). Permission to Operate (PTO) from LADWP typically takes 2-6 weeks after final inspection, sometimes longer in heavy queue periods. We share all permit applications, the inspection schedule, and the LADWP interconnection paperwork with you. | We use SolarAPP+ when eligible; otherwise standard LADBS plan check applies. LADWP PTO runs 2-6 weeks post-final. | LADBS solar permits are same-day issued always; no plan check needed. |
| Can we still claim the federal 25D residential solar credit? | The federal Residential Clean Energy Credit (Section 25D, the 30 percent solar tax credit) expired December 31, 2025 under the One Big Beautiful Bill Act (OBBBA, PL 119-21). Systems placed in service in 2026 or later are not eligible. We list the credit as expired in the proposal and do not deduct it from your project cost. The post-§25D LA solar payback story still works because LADWP's near-retail net metering credit is the strongest in California, but we model honestly without the federal credit. | 25D expired December 31, 2025 under OBBBA; we do not deduct it for 2026 installs. LADWP net metering still makes payback work without it. | The 30 percent solar tax credit is still in effect; just claim it on your taxes. |
| We are income-qualified. Can RSSE help fund the solar plus battery install? | Yes, possibly. RSSE (Residential Solar and Storage Equity, the AB 209 program) is administered by LADWP for City of LA customers and requires that the system include both solar and energy storage, or that you have an existing solar system and add a battery placed in self-consumption mode. Income eligibility is at or below 80 percent of Area Median Income, or enrollment in CARE, FERA, or ESA. As of February 2026 the program is fully reserved but accepting waitlist applications via sgip@ladwp.com. We apply on your behalf, document the waitlist position, and confirm we are not promising a payout that is not yet committed. | RSSE requires solar plus battery and income qualification; it is waitlisted as of early 2026. We apply on your behalf and list it at waitlist status. | RSSE pays for your whole solar plus battery; sign up after install. |
| Our LA Spanish-tile roof is 18 years old. Should we re-roof first? | Solar arrays typically have a 25-year production warranty; if your roof has fewer than 7-10 years of remaining life it usually makes sense to re-roof first to avoid R&R (remove and reinstall) the array later, which costs $2,000-$5,000+ depending on system size. Spanish tile complicates the math: tile-hook attachments are well-understood but tile breakage during install runs 3-7 percent, and re-roofing tile is expensive. We assess at the site visit, share the math on re-roof first versus install now, and let you decide. | If the roof has under 7-10 years left we recommend re-roof first; tile attachment adds breakage risk that we factor in. | Old roofs are fine; we'll work around it. |
| Do older LA Craftsman and Spanish homes need a structural review for the array attachment? | Often yes. Older LA single-family homes (1920s-1950s Craftsman, Spanish, mid-century) may have rafter dimensions or spacing that fall outside SolarAPP+'s standard structural assumptions. LADBS may require a stamped structural engineering review with PSI-tested tie-down details. We assess at the site visit, identify whether structural is required, and itemize the engineering scope separately. We do not bury structural fees in the array price. | LADBS often requires structural review for older Craftsman or Spanish stock; we assess at the site visit and itemize engineering separately. | Old homes never need a structural review; the panels are light. |
| Our home is in the LA hills WUI zone. How does CRC R337 affect the array layout? | For homes in CAL FIRE Very High FHSZ (Hollywood Hills, Brentwood, Bel Air, Pacific Palisades, Topanga, etc.), CRC R337 governs wildfire-resistant construction. The array layout follows California Fire Code roof-access pathway requirements: a 3-foot setback at ridges and a 3-foot pathway from the eave on a residential roof, with specific exemptions for steep slopes. The panels themselves are Class A fire-rated; conduit penetrations use fire-rated boots; combiner boxes near eaves need ignition-resistant placement. We document the FHSZ designation, the setbacks, and the rated hardware in the permit drawings. | Hills addresses follow CRC R337 and CFC roof-access pathway rules; we document FHSZ, setbacks, and rated hardware on the permit. | Fire rules do not change solar installs in LA. |
| How does the LA seismic environment affect array mounting and racking choice? | The LA seismic design category is high (Sds in the 1.0-1.5g range for most of the basin). Racking manufacturers publish seismic certifications (UL 2703 plus IBC engineering); we select racking with the appropriate seismic rating, set attachment density per the manufacturer engineering for your rafter geometry, and document the structural calculations in the permit set. Composition-shingle attachments use lag screws into rafters; tile-roof uses tile-hooks with rafter-pinned baseplates. We do not use spec-only fasteners or shortcut attachments. | We pick UL 2703 / IBC-engineered racking with the right seismic rating and document the structural calc in the permit. | Seismic does not matter for solar; the array is light. |
| Which inverter topology do you recommend for our LA install: microinverter or string? | Common choices: Enphase IQ8 microinverters (panel-level MPPT, rapid shutdown built-in, 25-year warranty, easier later expansion, premium price), or SolarEdge string inverter with power optimizers (panel-level optimization at lower per-watt price than micros, 12-year inverter warranty extendable to 20-25). For complex LA roofs (multiple orientations, partial shade from neighbor trees, dormer geometry on Spanish or Craftsman roofs) microinverters typically win. For simple single-azimuth large roofs, SolarEdge string usually has the better $/W. We model both and share the cost-benefit. Federal 25D being expired does not change which topology is right; the math now favors slightly lower-cost topologies. | We compare Enphase IQ8 versus SolarEdge string with optimizers and share the math; complex LA roofs typically favor micros. | Microinverters are always better; that is the only option. |
| Our home is in a canyon with mature trees. How do you handle shading in the production model? | We do a 3D shading analysis using HelioScope or Aurora with on-site measurements (Suneye or similar) for trees and adjacent structures. Hollywood Hills, Beachwood Canyon, Topanga, and many San Gabriel Foothills properties have meaningful winter shading from mature oaks, eucalyptus, or neighbor structures. The model shows per-month derate and which roof faces are affected. If panel-level mismatch is severe we recommend microinverters or optimizers; if shading is heavy on one face we re-scope the array. We share the shading inputs and the production output. | We do a 3D shading analysis with HelioScope or Aurora plus on-site measurements and share the inputs and per-month derate. | Shading is fine; modern panels handle it. |
| How do NEC 690 and 705 affect the design and how is rapid shutdown handled? | NEC 690 governs PV system design (conductor sizing, overcurrent protection, equipment listing); NEC 705 governs interconnection (the 120 percent busbar rule for back-fed inverter breakers). For a typical LA install on a 200A panel with a 40A back-fed inverter breaker, we verify 200 + 40 = 240A is under 120 percent of 200 = 240A (right at the limit; we document the calc). Rapid shutdown follows NEC 690.12 with module-level shutdown at the panel for Enphase or SolarEdge platforms. We document the calc, the rapid-shutdown method, and the labeling per NEC 690.56 in the permit set. | We document the NEC 705.12 calc, the rapid-shutdown method per NEC 690.12, and the labeling per NEC 690.56 in the permit. | NEC compliance is the inspector's problem. |
| How does Title 24 and the 2022 California Building Code apply to a retrofit solar install? | The Title 24 Solar Mandate (Section 150.1) requires PV on new residential construction. For a retrofit on an existing home, the mandate does not directly apply. The 2022 California Residential Code (Chapter 11) governs the structural attachment, fire setback, and roof-access pathway requirements. We design to the 2022 CRC and document the path in the LADBS permit set. If you are doing an addition or major remodel, the Title 24 retrofit-triggers rules can come into play; we identify that at the site visit. | Title 24 PV mandate is for new construction; we design retrofit to 2022 CRC. Major remodels trigger additional retrofit rules. | Title 24 forces PV on all retrofits. |
| What monitoring and commissioning do we get at the end of the install? | Monitoring is the Enphase Enlighten app (panel-level), SolarEdge mySolarEdge (string + optimizer-level), or the inverter manufacturer's platform. We register your account, set up alerts for production faults or under-performance, and confirm the gateway communicates with the cloud before leaving. The commissioning report includes the as-built single-line diagram, the actual production at sunrise / midday / sunset on a clear day, the inverter firmware version, and the LADWP PTO confirmation. We share the report. | We register the monitoring account and confirm gateway-to-cloud before leaving; we share the commissioning report including the LADWP PTO confirmation. | Monitoring is optional; you can set it up yourself. |
| What is the warranty stack for the panels, inverter, racking, and labor? | Typical warranties: panels 25 years (production guarantee, declining linearly to ~85 percent of nameplate), microinverters 25 years (Enphase IQ8) or string inverters 12 years extendable to 20-25 (SolarEdge), racking 20 years (UL 2703 platforms), labor 5-10 years (varies by installer). We list each warranty line in the proposal: who provides it, what triggers it, what is excluded (typically acts of God, vandalism, salt-air corrosion in some warranties). We register on your behalf and share confirmation. | Each component has its own warranty term and trigger; we list them in the proposal and register on your behalf. | Warranties are all 25 years; do not worry about the details. |
| We are planning a heat pump and EV charger in the next 2 years. Should we oversize the array now? | Probably yes. Adding heat pump HVAC, HPWH, and EV charging typically grows annual load by 4,000-8,000 kWh; sizing the array for that future load now costs slightly more incrementally and avoids a second LADBS permit cycle plus a second LADWP PTO. We use your current 12 months of LADWP bill data plus modeled future loads from Manual J and EV mileage, then size the array to that target. LADWP's net-metering credit is favorable, so slightly oversized arrays generally make financial sense in LA. We share the load model. | We model current usage plus future HP / EV loads and size the array to the target; LADWP net metering economics favor sizing for future load. | Always undersize and add later. |
| If we re-roof and install solar together, who coordinates LADBS permits and warranty? | We coordinate or partner with a roofer on a single project schedule: roof replacement first, then solar mount and electrical, with LADBS issuing separate permits for the roofing (typically Express) and the solar electrical (ePlanLA or SolarAPP+). Warranty handoff matters: the roofer warrants the underlayment and the roofing; we warrant the array attachment and the electrical. We document the boundary in writing so a leak in year 5 has a clear owner. We do not blur the warranty boundary. | We coordinate with the roofer on schedule, get separate LADBS permits, and document the warranty boundary in writing. | We do everything; warranty is one phone call. |
| We own an LA duplex or fourplex. Can solar credits split among tenants? | LADWP's Virtual Net Metering (VNM) program lets a single solar array on a multifamily property credit production across multiple LADWP meters (tenant units) proportional to a published allocation table. The property owner installs and owns the array; tenant credits show up on each tenant LADWP bill. This is a different program from single-family net metering and requires specific permit and interconnection paperwork. We confirm VNM availability at your address, identify the meter setup, and document the allocation table you choose. | LADWP Virtual Net Metering can split credits across tenant meters on multifamily property; we confirm availability and document the allocation table. | Solar credits cannot be split among tenants. |
| What is the LADWP solar interconnection application process and fee? | LADWP's interconnection application for residential PV under 30 kW is submitted online via ladwp.com after permit issuance. The application includes the single-line diagram, the inverter spec sheet, the array layout, the Class A roof confirmation if in a WUI zone, and the building permit number. An application fee applies (we list the current LADWP rate at quote time); the interconnection agreement is signed before LADWP authorizes meter-side commissioning. We submit on your behalf, share the application number, and track to PTO. We do not energize the system before PTO. | We submit the LADWP interconnection application after permit, share the application number, and wait for PTO before energizing. We list the current application fee in the proposal. | Just flip the breaker once the inspector signs off; LADWP figures it out. |
| Which circuits will be backed up during an outage, and for how long? | We provide a backup-loads list (refrigerator, internet, lights, HVAC controls, well pump if any), estimate runtime in hours at typical and worst-case usage, and explain whether whole-home or essential-loads backup is recommended. | — | The battery powers the house. |
| Does my install qualify for SGIP (Self-Generation Incentive Program), and at what tier? | We verify current SGIP budget status before quoting: as of December 31, 2025 the ratepayer-funded General Market, Equity, and Equity Resiliency budgets are closed to new applications, and only the AB 209-funded RSSE (Residential Solar and Storage Equity) tier remains open — and that budget is fully reserved with new applications served via an attrition-based waitlist (selfgenca.com). We document the waitlist position rather than promising a rebate, and we explain that pre-approval is required before equipment is delivered. | — | SGIP always pays out the maximum amount. |
| What is the battery's usable kWh and continuous inverter power, and how do they relate? | We specify both: kWh determines how long the backup lasts; the inverter's continuous AC output determines what can run at once (refrigerator + lights + maybe HVAC vs everything). | — | kWh is the only number that matters. |
| Is the battery AC-coupled or DC-coupled with the solar array, and why? | AC-coupled batteries use a separate inverter and are easier to retrofit to existing solar. DC-coupled batteries share an inverter with new solar and are typically more efficient end-to-end. We choose based on whether the solar array is new or existing. | — | Coupling does not matter. |
| Can we add more battery capacity later, and what are the limits? | Most modern systems support stacking additional units up to a vendor-specified maximum. We document the maximum stack today, what is needed to add capacity later (matching firmware, software update, possible electrical re-work), and whether SGIP can be applied to expansion units. | — | Buy the biggest battery today; expansion is impossible. |
| What depth-of-discharge limit does the battery use, and how does that affect usable kWh? | We explain the nameplate kWh vs usable kWh: modern LFP batteries reserve very little for cycle life (often 95 to 100 percent of nameplate is usable); older chemistries reserve 10 to 20 percent. We quote usable kWh in the proposal so you can compare like-for-like. | — | Nameplate kWh is the usable kWh. |
| What is the manufacturer warranty on the battery, and what limits it? | Most residential batteries carry a 10 to 12 year warranty, often paired with a cycle count (e.g. 6,000 to 10,000 cycles) or throughput limit (e.g. 37.8 MWh) - whichever comes first. We provide the spec sheet and explain what voids coverage. | — | Lifetime warranty; no fine print. |
| Are time-of-use arbitrage cycles counted against the warranty? | Yes. Every charge-discharge cycle counts toward the throughput limit; aggressive daily TOU arbitrage may shorten the years-based warranty window. We model expected cycles per year for your usage pattern. | — | Cycling does not count against the warranty. |
| How will the battery shift load away from PG&E peak hours? | We program the battery to charge from solar during midday and discharge during the PG&E EV2-A or E-ELEC peak window (typically 4-9pm), saving you the peak-period delta. We tune the schedule for your actual usage and rate plan. | — | The battery charges and discharges whenever. |
| How does NEM 3.0 change the battery payback? | Under NEM 3.0, export compensation dropped by roughly 75 percent, so self-consumption (using your solar via the battery instead of exporting) is now the primary battery economic driver. We model expected savings under NEM 3.0 with your specific rate plan. | — | NEM 3.0 has no effect on battery payback. |
| How will the install meet CRC 1207 / R327 fire-setback rules for energy storage? | We design the install per California Residential Code R327 (formerly section 1207): separation from windows, doors, openings into the dwelling, and other batteries; smoke and heat detectors per code; and an exterior wall location where possible. We document compliance in the permit submittal. | — | Fire setbacks are optional. |
| What is your post-install commissioning checklist? | Commissioning includes verifying battery state-of-charge reporting, testing backup-mode transfer with a simulated outage, walking through the app for backup-only vs TOU modes, and confirming the SGIP system performance metering is functioning if SGIP is part of the project. | — | We turn it on and leave. |
| Are you an installer certified by the battery manufacturer? | Yes. We provide our certification number for the specific battery brand (Tesla Powerwall, Enphase IQ, LG Chem RESU, FranklinWH, etc.); certification is typically required to preserve full warranty coverage. | — | Certification does not matter for batteries. |
| Who handles the PG&E interconnection update for the new battery? | We submit the updated PG&E interconnection paperwork to add the battery to your existing or new solar interconnection, and we obtain the updated Permission to Operate before energizing. | — | PG&E interconnection happens automatically. |
| What panel-side breaker work or interconnection method does the battery require? | We confirm whether the battery interconnects via a back-fed breaker (with sum-of-breakers check per NEC 705.12), a supply-side tap, or a dedicated battery sub-panel; we show the calculation on the permit drawings. | — | Any spare slot will work. |
| Does the federal Section 25D residential clean energy credit apply to my battery install? | Section 25D expired December 31, 2025 under the One Big Beautiful Bill Act (Public Law 119-21). Battery installations completed in 2026 or later do not qualify for the 30 percent §25D credit. | — | You will receive the 30 percent federal credit on your taxes. |
| Does HEEHRA or TECH Clean California currently offer a battery incentive? | Neither HEEHRA nor TECH primarily fund residential batteries; SGIP is the main California battery program. We verify current TECH scope at techcleanca.com and HEEHRA status at energy.ca.gov before citing any battery incentive. | — | HEEHRA covers batteries automatically. |
| Will the quote separate confirmed SGIP incentives from assumed? | Yes. SGIP is marked confirmed only after pre-approval is granted and the funding tier is reserved; we mark the line as assumed in the quote until then and explain the reservation status. | — | All listed incentives are yours. |
| What is the best next step before signing a battery contract? | Get a written quote with line-item pricing including usable kWh, continuous AC inverter output, AC vs DC coupling, manufacturer warranty terms (years AND cycles AND throughput), labor warranty separately, SJPermits.org permit fees, PG&E interconnection plan, and an honest SGIP workflow: as of December 31, 2025 only the AB 209-funded RSSE budget accepts new applications and it is fully reserved (attrition-based waitlist via selfgenca.com), so the proposal documents the waitlist position rather than promising a rebate. | — | Sign today to lock in SGIP before funding runs out. |
| Does SGIP apply for a battery install on LADWP? | Statewide SGIP General Market, Equity, and Equity Resiliency budgets do not apply to LADWP customers; those budgets are CPUC-administered and ratepayer-funded by IOUs (PG&E, SCE, SDG&E, SoCalGas). LADWP runs its own SGIP-equivalent: the Residential Solar and Storage Equity (RSSE, AB 209) program for income-qualified solar plus battery customers, administered through sgip@ladwp.com. As of February 2026 RSSE is fully reserved but accepting waitlist applications. For non-income-qualified LADWP customers there is no comparable statewide-tier general market rebate. We do not promise SGIP payouts that do not apply on LADWP. | Statewide SGIP does not apply to LADWP customers. LADWP runs RSSE for income-qualified solar plus battery; it is waitlisted as of early 2026. | Statewide SGIP pays for batteries; sign up after install. |
| Does a battery actually improve payback under LADWP net metering, the way it does on PG&E NEM 3.0? | The economics are different. Under LADWP's near-retail net metering, exported solar already earns close to retail credit, so the self-consumption benefit of a battery is much smaller than under PG&E NEM 3.0 (where exports earn roughly 75 percent less). The case for a battery in LA is more about backup resilience (Santa Ana wind events, PSPS in some hillside neighborhoods, planned LADWP outages for system work) than about bill arbitrage. We model both bill impact and outage resilience and let you decide. We do not pretend the bill savings justify the battery; that math is honest on PG&E and weaker on LADWP. | On LADWP the battery economic case is weaker than on PG&E NEM 3.0; the case is more about backup resilience. We model both honestly. | Adding a battery always cuts your LADWP bill in half. |
| What backup loads should we plan for in an LA outage? | Typical LA residential backup-loads: refrigerator (continuous 100-200W average, 800W startup), interior lighting (LED 50-150W total), Wi-Fi and router (20-30W), TV plus AV (100-200W), phone and laptop charging (50W), and during summer at least one window or mini-split for cooling load (a 1-ton mini-split runs 800-1500W). For Santa Ana wind events or planned LADWP outages running 6-12 hours, a 13.5 kWh battery covers everyday backup; for 24-hour outages with cooling we typically recommend 27 kWh or solar plus battery to recharge mid-day. We size from your specific list, not a generic load. | We size from your specific backup-loads list; 13.5 kWh covers basic 6-12 hour outages, 27 kWh or solar plus battery for 24+ hour with cooling. | 13.5 kWh works for everyone in LA. |
| What does the LADBS permit process look like for a battery install? | We pull a LADBS electrical permit through ePlanLA for the battery and its interconnection. For wall-mounted batteries we also document the structural attachment per the manufacturer install manual, including the LA seismic anchor schedule. Fire setback per CRC R327 (statewide) and any WUI-zone enhancements from R337 apply to outdoor or garage installs adjacent to combustible construction. We document the setback measurements on the permit drawings. Final card sign-off happens at the LADBS inspection. We share all permit copies. | We pull LADBS electrical permit, document structural anchor per manufacturer schedule, and document CRC R327 setbacks. We share copies on submission. | Batteries under 20 kWh do not need a permit in LA. |
| Can we claim the federal 25D credit on the battery? | The federal Residential Clean Energy Credit (Section 25D, 30 percent) expired December 31, 2025 under the One Big Beautiful Bill Act (OBBBA, PL 119-21). Standalone battery (installed without solar) or solar-plus-battery installs placed in service in 2026 or later are not eligible. We list the credit as expired in the proposal and do not deduct it from your project cost. For LADWP customers, this is meaningful because the LADWP economic story for a battery without 25D is weaker than under prior law; we present the post-25D math honestly. | 25D expired December 31, 2025 under OBBBA; we do not deduct it for 2026 installs. | 25D is still 30 percent; deduct it from the quote. |
| Our wall-mount battery is heavy. How is it seismically anchored in our LA Spanish house? | A Tesla Powerwall 3 weighs about 290 pounds; Enphase IQ Battery 5P weighs about 165 pounds; FranklinWH aPower 2 is about 350 pounds. CBC seismic detailing requires anchoring to structural framing (wood studs, masonry, or concrete) using the manufacturer's published seismic anchor schedule. For LA Spanish stucco-on-wood we drill through stucco into studs with the manufacturer's specified lag size and pattern; for masonry walls we use expansion anchors rated for the seismic load. We include the structural detail in the LADBS permit set. We do not anchor to drywall. | We follow the manufacturer's seismic anchor schedule into studs or rated anchors and document the detail in the LADBS permit. | Just hang it on the wall; the wall holds. |
| Our home is on a Hollywood Hills WUI lot. Does CRC R327 affect where the battery goes? | Yes, multiple rules interact. CRC R327 (statewide ESS rules) requires battery siting setbacks from openings, exit pathways, and combustible construction; CRC R337 (WUI zones) adds wildfire-rated construction requirements for adjacent assemblies. Garage installs adjacent to a habitable space need fire-rated separation. Outdoor wall mounts on WUI lots need ignition-resistant placement. We verify the FHSZ designation, walk through the setback measurements on-site, and document everything in the permit set. We do not install the battery in a marginal location and hope it passes inspection. | We follow CRC R327 setbacks plus R337 for WUI lots and document measurements on the permit. | Just bolt it to the wall; LADBS does not check ESS setbacks closely. |
| Can the battery shift LADWP TOU-charged loads to save on the bill? | For LADWP R-1B TOU customers, a battery can charge during the Base period (8pm-10am weekdays, all weekend) and discharge during High Peak (weekdays 1pm-5pm) and Low Peak (10am-1pm and 5pm-8pm) windows. The arbitrage value is the rate spread between Base and High Peak. We model this against your usage and share the year-1 estimate. For most LA residential homes the arbitrage value is modest (typically a few dollars per month per kWh of battery capacity) because LADWP rate spreads are narrower than PG&E TOU spreads. The case is still primarily resilience, not arbitrage. | TOU arbitrage on LADWP is modest because spreads are narrower than PG&E; we model honestly and share the math. | Battery pays for itself in 2 years on LADWP TOU. |
| Should we back up the whole house or use a critical-loads sub-panel? | Three options: whole-house backup (battery and inverter sized to carry total connected load including AC compressors and EV charging during outage, more expensive), critical-loads sub-panel (a separate sub-panel with only essential circuits backed up, lower battery capacity needed), or smart-panel-style load management (Span, Lumin, or Schneider Square D Energy Center that disable non-critical loads automatically during outage). For LA homes with central AC, whole-house typically requires 2-3 batteries; critical-loads with a smart-panel typically works with one. We model each and share the cost-benefit. | We model whole-house versus critical-loads sub-panel versus smart-panel options and share the cost-benefit; one battery rarely runs an LA central AC house. | Whole-house backup is always the right answer. |
| Which battery brands do you install in LA and what are the tradeoffs? | Common 2026 LA installs: Tesla Powerwall 3 (13.5 kWh usable, integrated inverter, supports up to 4 units, AC-coupled with optional DC), Enphase IQ Battery 5P (5 kWh per unit, modular, AC-coupled, pairs with IQ8 microinverters), FranklinWH aPower 2 (15 kWh usable, integrated, often less expensive per kWh), LG Energy Solution RESU PRIME (DC-coupled, paired with compatible inverter). We compare on: usable capacity per dollar, warranty terms (cycles plus throughput), local service availability in LA, monitoring app quality, and compatibility with your existing or planned solar inverter. We do not push one brand; we share the comparison. | We compare Powerwall 3, Enphase 5P, FranklinWH, and LG RESU PRIME on capacity, warranty, local service, and inverter compatibility. We share the comparison. | Tesla Powerwall is the only option worth considering. |
| Should the battery be AC-coupled or DC-coupled to the solar? | AC-coupled (Tesla Powerwall 3, Enphase 5P, FranklinWH) has its own integrated inverter, works with any existing solar inverter, and is the typical retrofit path. DC-coupled (LG RESU PRIME with SolarEdge or Sol-Ark hybrid inverter) shares the solar inverter and is slightly more efficient when round-tripping solar through the battery, useful for new solar plus battery installs being designed together. For a retrofit on existing solar, AC-coupled almost always wins on cost and simplicity. For a new install, we model both. We document the topology choice and the inverter compatibility in the proposal. | AC-coupled for retrofits, evaluate both for new installs. We document the topology choice and inverter compatibility. | DC-coupled is always the right choice. |
| What UL certifications matter and why? | UL 9540 covers ESS as a system (battery plus inverter plus controls); UL 9540A is the thermal-runaway propagation test that verifies a single-cell failure does not cascade into adjacent units. For LA installs (CRC R327 plus CFC requirements) UL 9540 listing is required and UL 9540A test data informs the setback distances in the permit. We list both certifications in the proposal and provide the cell-pack test data when LADBS requests it for hillside or attached-garage installs. We do not install non-listed equipment. | UL 9540 listing is required; UL 9540A test data may inform R327 setback. We list both in the proposal. | UL listing is just a sticker; nobody checks. |
| How do NEC 706 and 705 apply to the battery interconnection? | NEC Article 706 covers ESS installations (disconnects, overcurrent protection, signage, working clearances). NEC 705.12 covers parallel-source interconnection: for a battery plus solar plus utility on the same busbar, we verify the 120 percent busbar rule, or use a supply-side tap if 120 percent fails. For LADWP service, the disconnect must be accessible to the utility and labeled per LADWP service-rule conventions. We document each NEC citation in the permit set. We do not short-circuit the calc to make it 'fit'. | We document NEC 706 ESS requirements and the NEC 705.12 busbar calc; supply-side tap if 120 percent fails. We label per LADWP service rules. | NEC compliance is the inspector's problem. |
| What battery warranty terms should we look at? | Battery warranties have three dimensions: years (typically 10), cycles (typically 5,000-10,000), and throughput (typically 27-40 MWh total energy passed through). Whichever limit is hit first ends the warranty. Tesla Powerwall 3 is 10 years and unlimited cycles for daily use, 70 percent capacity retention; Enphase IQ Battery 5P is 15 years and 6,000 cycles, 60 percent retention; FranklinWH aPower 2 is 15 years and 12,000 cycles. We list each warranty's three dimensions in the proposal, register on your behalf, and share confirmation. We do not let 'warranty' marketing copy substitute for the actual terms. | We list each warranty's years, cycles, and throughput in the proposal and register on your behalf. | Warranty is 10 years; that's all you need to know. |
| What monitoring and commissioning do we get? | Monitoring is the brand app (Tesla app, Enphase Enlighten, FranklinWH app, etc.). We register your account, set up outage and low-SOC alerts, confirm the gateway communicates with the cloud, and walk through the app together. Commissioning includes a backup-test (simulate grid outage by opening the main breaker, confirm battery picks up critical loads within the inverter's transfer time, typically 200-500 ms), state-of-charge verification, and a signed commissioning sheet with measured values. Without commissioning the battery may not transfer cleanly during a real outage. The LADBS inspection card is separate from the commissioning sheet. | We do a backup-test, register the monitoring account, and share the signed commissioning sheet. | Push the button at the end; you don't need a backup test. |
| How do Santa Ana winds and LADWP outages compare to PG&E PSPS for sizing the battery? | LADWP does not run PSPS the way PG&E does in the East Bay and rural Sierra foothills; LADWP is largely underground in many neighborhoods and Santa Ana wind events affect overhead lines mostly in the foothills. That said, LADWP does occasionally plan equipment outages and Santa Ana events can knock out service for 4-24 hours in the hills. We size for that risk window based on your address and your tolerance: 13.5 kWh for short outages, 27 kWh or more for longer events with cooling load. We do not size for a hypothetical week-long event unless you specifically want that resilience tier. | LADWP outage risk varies by neighborhood; we size to your address-specific risk window and your resilience tolerance. | LADWP never has outages; you don't need backup. |
| How do you handle grounding for the battery in an older LA house? | NEC Article 250 requires the ESS to be bonded to the existing grounding electrode system. Older LA Spanish, Craftsman, and bungalow homes sometimes have only a single ground rod, an undersized water-pipe bond, or both; the existing system may not meet current code for a new ESS. We measure the existing grounding electrode resistance, document compliance, and add supplemental electrodes (typically a second 8-foot copper-clad rod 6 feet from the first) if required. We include the grounding work as a line item in the proposal. | We measure existing grounding and add supplemental electrodes if required; older LA homes often need an upgrade. | Just bond it to the panel; that's enough. |
| Can a battery work with LADWP Virtual Net Metering on a multifamily property? | LADWP Virtual Net Metering for multifamily property covers the solar export allocation across tenant meters. Adding a battery to a VNM-property complicates the interconnection: the battery's discharge timing affects which meter sees the credit. We confirm LADWP's current VNM-plus-storage rules at quote time (the program has been evolving) and document the configuration. For most single-family LA homes this is not a question; for duplex / triplex / fourplex property owners adding both solar and battery, we walk through the metering implications carefully. | VNM plus battery on multifamily property requires careful LADWP interconnection coordination; we confirm current rules and document the configuration. | VNM plus battery just works; LADWP figures it out. |
| What is the best next step before signing an LA battery contract? | Schedule a site visit, confirm your LADWP service (and not SCE), decide on the backup-loads list and battery sizing, run the LADWP TOU bill-impact and outage-resilience models, and — if income-qualified — check LADWP's RSSE (AB 209-funded Residential Solar and Storage Equity, sgip@ladwp.com) eligibility honestly: as of December 31, 2025 RSSE is fully reserved and accepting only waitlist applications via attrition. Statewide SGIP General Market / Equity / Equity Resiliency budgets do not apply to LADWP customers and are themselves closed to new apps. Get a written quote with line-item pricing: battery hardware, inverter, gateway, installation labor, LADBS permits, structural attachment, monitoring setup. Compare two or three bids on the same scope and battery brand. We do not pressure you to sign on the first call. | Compare two or three bids on the same scope after a site visit and a written backup-loads list; check LADWP RSSE if income-qualified — it is waitlisted as of Dec 31, 2025. | Sign today; LADWP rebates run out tomorrow. |
| Will the LADBS permit fee, structural review, and rebate paperwork all show up itemized in the proposal? | Yes. The proposal itemizes: LADBS electrical permit fee (typically $200-$500 depending on system size after the June 9, 2026 GPMS surcharge increase from 7 to 10 percent), structural review if required (typically $500-$1,500), RSSE rebate paperwork submission as a labor line if eligible, LADWP interconnection application fee, and any monitoring setup labor. We do not bundle these into 'labor' as a lump sum. Bundling is how installers hide the actual rebate value pass-through. | We itemize LADBS permit fee, structural review, RSSE submission if eligible, LADWP interconnection fee, and monitoring setup in the proposal. | Permits are bundled; do not worry about the breakdown. |
Green flags, reasonable caveats, red flags
Green flags
- LADWP-vs-NEM-3.0 framing made explicit: LADWP net metering credits exports at $0.22-0.37 per kWh near retail, not the NEM 3.0 ACC-derate that applies on IOUs
- PVsyst or HelioScope production model with LA neighborhood-microclimate derate (coastal, basin, Valley, foothill) and 3D shading analysis for mature trees
- RSSE (Residential Solar and Storage Equity, AB 209) eligibility checked at sgip@ladwp.com for income-qualified solar plus battery customers; waitlist application reference documented
- Backup-loads list sized for the address-specific outage risk window (Santa Ana wind events plus planned LADWP outages, typically 4-24 hours)
- Seismic-rated racking (UL 2703 + IBC engineering) selected with the right attachment density for the rafter geometry
- Fire setback (CRC R327 statewide ESS plus R337 for WUI Hills) documented in the permit drawings
Reasonable caveats
- LADWP Solar Incentive Program closed in late 2018 and is not reopened broadly; we do not deduct an SIP rebate from 2026 installs
- Statewide SGIP General / Equity / Equity Resiliency tiers do not apply to LADWP customers; RSSE is the LADWP path and is waitlisted as of February 2026
- Older Spanish-tile and Craftsman roofs may need structural review plus tile-hook attachment; tile breakage during install runs 3-7 percent
- Roofs with under 7-10 years remaining life should re-roof before install to avoid R&R later
- LADWP interconnection (PTO) typically runs 2-6 weeks post-final inspection, sometimes longer in heavy queue periods
Red flags
- Promises specific kWh production without modeling
- Lists §25D federal credit as applicable for 2026+ installs
- Claims a closed LADWP Solar Incentive Program rebate as part of project savings
- Pitches SGIP General Market or Equity Resiliency on LADWP service (those statewide tiers do not apply)
- Skips structural review on a Spanish or Craftsman rafter geometry
- Skips the FHSZ designation check for Hills addresses
Quote checklist
Check every item before signing.
Required
Optional but recommended
Quote comparison worksheet
Print this and fill in by hand, or capture quotes side-by-side as you receive them.
| Line item | Contractor 1 | Contractor 2 | Contractor 3 |
|---|---|---|---|
| Quote models future load (heat pump, EV, water heater) for sizing, not just past consumption. (required) | |||
| Quote uses NEM 3.0 export rates and explicitly notes the change from NEM 2.0. (required) | |||
| Quote includes roof condition assessment with remaining lifetime estimate. (required) | |||
| Quote specifies panel and inverter brand, wattage, efficiency, and warranty. (required) | |||
| Quote includes a shading analysis and string or microinverter design notes. (required) | |||
| Quote states the production guarantee (kWh/year) and how it is enforced. | |||
| Quote names the monitoring platform and any subscription cost. | |||
| Quote names who handles PG&E interconnection paperwork. (required) | |||
| Quote separates confirmed incentives from assumed with reservation status. (required) | |||
| Quote confirms the install is on LADWP (not SCE plus CPA) and models production against LADWP's near-retail net metering credit, not NEM 3.0. (required) | |||
| Quote includes a 12-month production model with LA neighborhood-microclimate derate (coastal vs basin vs Valley vs foothill). (required) | |||
| Quote names who pulls the LADBS electrical permit (ladbs.org via ePlanLA or SolarAPP+), structural review if required, and itemizes the fee. (required) | |||
| Quote names whether RSSE (Residential Solar and Storage Equity) eligibility was checked, and includes the waitlist application reference if pursued. | |||
| Quote documents the FHSZ designation against the address and any CRC R337 hardware required for LA Hills installs. | |||
| Quote states usable kWh (not just nameplate) and continuous AC inverter output. (required) | |||
| Quote includes a backup-loads list with runtime estimates. (required) | |||
| Quote states whether the battery is AC-coupled or DC-coupled with the solar array. (required) | |||
| Quote states current SGIP budget status (as of 2026, ratepayer-funded General Market / Equity / Equity Resiliency budgets are no longer accepting new applications; only AB 209-funded RSSE remains open and that budget is fully reserved with new apps on a waitlist served via attrition) and any RSSE waitlist application reference if pursued. (required) | |||
| Quote confirms compliance with CRC 1207 / R327 fire setback rules for the chosen install location. (required) | |||
| Quote specifies battery warranty (years, cycles, throughput) and labor warranty separately. (required) | |||
| Quote names the battery monitoring platform and any user-side controls (time-of-use scheduling, backup-mode toggle). | |||
| Quote names who handles PG&E interconnection updates for the battery. (required) | |||
| Quote explains the SGIP RSSE waitlist application workflow and timeline before equipment is delivered (RSSE is the only SGIP tier accepting new applications as of 2026, and its budget is fully reserved with new apps on a waitlist served via attrition). | |||
| Quote names whether RSSE (LADWP-administered Residential Solar and Storage Equity, AB 209) eligibility was checked and includes the waitlist application reference if income-qualified; quote states clearly that statewide SGIP General / Equity / Equity Resiliency tiers do not apply to LADWP customers. (required) | |||
| Quote names who pulls the LADBS electrical permit (ladbs.org via ePlanLA) and itemizes CRC R327 (and R337 for Hills) fire-setback measurements. (required) | |||
| Quote includes both a year-1 LADWP TOU bill-impact model (acknowledging the LADWP rate spread is narrower than PG&E) and a backup-loads list sized for the address-specific outage risk window. (required) | |||
| Quote documents the manufacturer seismic anchor schedule (stud / masonry attachment) used for the wall-mount battery in the LA seismic design category. (required) |
Incentive verification worksheet
| Program | Amount | Eligibility | Pre-approval? | Confidence | Verified | Source |
|---|---|---|---|---|---|---|
| Section 25D Residential Clean Energy Credit (solar PV) | Expired Dec 31, 2025. For 2023–2025: 30% of total installed cost, no cap. | EXPIRED: This federal credit ended Dec 31, 2025 under the One Big Beautiful Bill Act (Public Law 119-21, signed July 4, 2025). Expenditures made after Dec 31, 2025 do not qualify — for §25D, the IRS treats the expenditure date as the date the installation is placed in service (completed), not the date of payment. A homeowner who paid a deposit in 2025 but whose system was placed in service in 2026 does not qualify. For installations placed in service during 2023–2025, the credit applied to solar PV systems supplying electricity to a U.S. residential dwelling used by the taxpayer as a residence (principal residence not required; second homes qualified; rentals not occupied by the taxpayer did not qualify), satisfying applicable fire and electrical codes, with installation costs included in the credit basis. The credit was nonrefundable with carryforward. Homeowners with eligible 2025 placed-in-service installations may still claim the credit on their 2025 federal tax return. Verify with a qualified tax professional. | Verify | high | 2026-05-30 | Internal Revenue Service, Internal Revenue Service, ENERGY STAR (EPA/DOE) |
| Section 25D Residential Clean Energy Credit (battery storage) | Expired Dec 31, 2025. For 2023–2025: 30% of total installed cost, no cap (battery capacity at least 3 kWh). | EXPIRED: This federal credit ended Dec 31, 2025 under the One Big Beautiful Bill Act (Public Law 119-21, signed July 4, 2025). Expenditures made after Dec 31, 2025 do not qualify — for §25D, the IRS treats the expenditure date as the date the installation is placed in service (completed), not the date of payment. A homeowner who paid a deposit in 2025 but whose system was placed in service in 2026 does not qualify. For installations placed in service during 2023–2025, the credit applied to battery storage systems with a rated capacity of at least 3 kilowatt-hours installed in a U.S. home used by the taxpayer as a residence (existing homes and new construction; principal residence not required; rentals not occupied by the taxpayer did not qualify). Standalone batteries (not paired with solar) were explicitly eligible from Jan 1, 2023 onward. The credit was nonrefundable with carryforward. Homeowners with eligible 2025 placed-in-service installations may still claim the credit on their 2025 federal tax return. Verify with a qualified tax professional. | Verify | high | 2026-05-30 | Internal Revenue Service, Internal Revenue Service, ENERGY STAR (EPA/DOE) |
| California Self-Generation Incentive Program (SGIP) — residential battery storage | As of 2026-06-08, only the Residential Solar and Storage Equity (RSSE) AB 209 budget remains open for new applications, and that budget is fully reserved — new applications are placed on a waitlist served through attrition of cancelled projects. Per-kWh rates by tier (for context — only RSSE accepts new apps in 2026): RSSE $1,100/kWh storage + $3,100/kW solar; Equity Resiliency $1,000/kWh; Equity $850/kWh; San Joaquin Valley Residential $1,100/kWh; Small Residential Storage / General Market $150/kWh. Per-project totals depend on installed battery capacity (kWh) and tier eligibility. | Administered by the California Public Utilities Commission (CPUC) and delivered through utility program administrators (PG&E, Center for Sustainable Energy / SDG&E territory, SoCalGas, SCE; LADWP customers are not eligible). Budget status as of 2026-06-08: per SGIP program administrator (CSE / sgipsd.org), 'as of December 31, 2025, all new application submissions are strictly available to the Residential Solar and Storage Equity (RSSE) AB 209 budget. At this time, all available RSSE AB 209 funding has been reserved.' New RSSE applications are placed on a waitlist in order received and funded through attrition of cancelled projects. The ratepayer-funded General Market, Equity, and Equity Resiliency budgets are not accepting new applications. Tier rates for reference (applicable to reservations made while budgets were open): (1) Residential Solar and Storage Equity (RSSE) — $1,100/kWh storage plus $3,100/kW solar; low-income residential customers; AB 209-funded; reservation window opened June 2, 2025. (2) Equity Resiliency — $1,000/kWh; IOU residential customers in high fire-threat districts and/or medical baseline / income-qualified. (3) Equity — $850/kWh; income-qualified IOU residential customers. (4) San Joaquin Valley Residential — $1,100/kWh; PG&E and SCE pilot footprint. (5) Small Residential Storage / General Market — $150/kWh. Reservations require a one-year completion window and enrollment in a qualified Demand Response program. Tier eligibility, income documentation, HFTD-tier residency, and budget-availability status must be verified against the current SGIP Handbook and the customer's utility administrator before any contractor work begins. | Yes | high | 2026-06-08 | California Public Utilities Commission (CPUC) |
| California Net Billing Tariff (NEM 3.0) — solar export compensation framework | Policy framework, not a direct rebate. Excess solar generation exported to the grid is compensated at a rate reflecting the time-varying grid value of that generation (Avoided Cost Calculator methodology), rather than at the retail electricity rate that NEM 2.0 used. Net export compensation under the Net Billing Tariff is typically materially lower than under NEM 2.0; pairing solar with battery storage may materially affect project economics under this framework. | POLICY IN EFFECT — NOT A REBATE: The Net Billing Tariff (NBT), commonly called 'NEM 3.0,' is the current Net Energy Metering framework for new residential solar interconnections in California, adopted by CPUC Decision 22-12-056 and effective for applications submitted on or after 2023-04-15. It applies to new customer-generator interconnections in the three large investor-owned utility territories: Pacific Gas and Electric (PG&E), Southern California Edison (SCE), and San Diego Gas & Electric (SDG&E). LADWP and other publicly owned utilities operate their own net-metering tariffs and are not covered by NBT. Under NBT, onsite solar generation first offsets the customer's own consumption; excess generation exported to the grid is compensated at a time-varying export rate based on the grid's avoided cost rather than the retail rate. Existing NEM 1.0 / NEM 2.0 customers are generally grandfathered under the legacy tariff for a defined period from their original interconnection date — verify against the customer's utility for the legacy term. Homeowners considering new residential solar in PG&E / SCE / SDG&E territory should model project economics specifically under NBT, with and without paired battery storage, before signing a contract. | Interconnection application required, not a financial preapproval. | high | 2026-05-30 | California Public Utilities Commission (CPUC) |
| LADWP Solar — Net Metering (No Upfront Rebate) | As of 2026-05-30, LADWP does NOT offer a residential upfront solar PV rebate; its legacy Solar Incentive Program for residential customers has been closed. The compensation mechanism for LADWP residential solar is net metering: excess generation exported to the grid is credited at the customer's applicable retail rate (R-1A tier price or R-1B TOU price). System size cap is 1 MW. Important: LADWP customers are NOT subject to CPUC's NEM 3.0 / Net Billing Tariff (NBT) — that framework applies only to PG&E, SCE, and SDG&E customers. Homeowners should verify current LADWP NEM terms before signing a contract, as municipal tariffs can change at LADWP Board action. | LADWP residential electric customer with an active meter. System must meet LADWP interconnection requirements (sizing relative to historical load, equipment on approved list, LA Department of Building and Safety permitting and inspection). For solar paired with battery, separate interconnection rules apply. | Interconnection application required, not a financial preapproval. | medium | 2026-05-30 | Los Angeles Department of Water and Power |
| LADWP Customers and CPUC-IOU Programs — Eligibility Disclosure | As of 2026-05-30, LADWP residential customers are generally NOT eligible for the following CPUC-administered or IOU-funded California incentive programs, which are restricted to investor-owned utility (PG&E, SCE, SDG&E) customers: TECH Clean California (heat pump incentives — fully reserved as of Pass 2 in any case), HEEHRA-CA (single-family heat pump rebates — fully reserved single-family as of Pass 2), the Self-Generation Incentive Program (SGIP — battery storage), Golden State Rebates (IOU joint program), and the CPUC NEM 3.0 / Net Billing Tariff for new solar interconnections. LADWP runs its own parallel rebate portfolio (Consumer Rebate Program for HVAC / water heating / cool roofs, Charge Up LA! for EV chargers, and its own net-metering tariff). Homeowners served by LADWP should look to the LADWP CRP rather than CPUC-IOU programs when scoping incentives. | Applies to all LADWP-served residential addresses. Homeowners who are unsure whether they are served by LADWP or SCE should check the utility name printed on their most recent electric bill — the eligible program set differs materially between the two utilities even within LA County. | Verify | high | 2026-05-30 | Los Angeles Department of Water and Power |
Permit verification worksheet
| Permit | Jurisdiction | Applies to | Confidence | Verified | Source |
|---|---|---|---|---|---|
| Electrical + building permit | city | Solar Panels | medium | 2026-05-31 | Los Angeles Department of Building and Safety, Los Angeles Department of Building and Safety, Los Angeles Department of Building and Safety, Los Angeles Department of Building and Safety, City of Los Angeles |
| Electrical + building permit | city | Battery Storage | medium | 2026-05-31 | Los Angeles Department of Building and Safety, Los Angeles Department of Building and Safety, Los Angeles Department of Building and Safety, Los Angeles Department of Building and Safety, Los Angeles Fire Department |