California’s residential solar rate structure for systems interconnecting with investor-owned utilities (SCE, PG&E, SDG&E) after April 14, 2023. Solar exports are credited at the avoided-cost rate (~$0.05-0.08/kWh) instead of retail rate (~$0.25-0.40/kWh). Battery storage is essentially required for reasonable payback. LADWP customers operate under NEM 1.0 / 2.0 legacy rules that are more favorable.

Legacy net metering rate structure. Customers who installed solar with interconnection applications submitted before April 14, 2023 (and approved before April 13, 2024) maintain NEM 2.0 status for 20 years from PTO (Permission to Operate). NEM 2.0 credits exports at retail rate minus non-bypassable charges. Most LADWP customers operate under similar legacy terms.

For residential systems placed in service through December 31, 2025, the federal tax credit may be available, subject to eligibility and current law, on the installed cost of solar panels, solar-plus-battery systems, and stand-alone batteries (Tesla Powerwall, Enphase IQ Battery). Under current law this residential credit is no longer available for new projects placed in service in 2026. Confirm current eligibility with your tax professional; Home Upgrade Specialist is not a tax advisor.

The utility-issued certificate authorizing a residential solar system to interconnect with the grid and export power. LADWP and SCE both issue PTO after final inspection. Your NEM grandfathering date is the PTO date, not the install date.

National Renewable Energy Laboratory’s automated solar permitting platform. Cities that participate (Santa Monica, San Jose, Tucson, etc.) issue residential solar permits in 24-48 hours through SolarAPP+ vs the typical 2-4 week manual permitting process.

kW DC (direct current) is the nameplate rating of solar panels at standard test conditions. kW AC (alternating current) is the post-inverter rating that actually feeds your home and the grid. AC is typically 80-85% of DC. When a contractor quotes “7kW system” they usually mean DC.

The percentage of solar production used directly in your home (vs exported to the grid). Under NEM 3.0, self-consumption ratio matters enormously because grid export rates are low. A solar-only system might self-consume 30-40%; adding a battery pushes this to 80-95%.

String inverters convert DC from multiple panels at one point (cheaper, faster shutdown if one panel fails). Microinverters (Enphase IQ series) sit on each panel for panel-level optimization (more expensive, better shading performance, 25-year warranty). Tesla Powerwall 3 has a built-in solar inverter, eliminating the need for a separate string inverter.

Tesla Energy’s 2024-2026 home battery. 13.5 kWh usable capacity, 11.5 kW continuous output, includes built-in solar inverter (97.5% efficient). LFP chemistry. 10-year warranty. Installed by Tesla Certified Premium Installers like Home Upgrade Specialist.

Enphase’s modular battery storage system. 5 kWh per unit, 3.84 kW continuous (7.68 kW peak). Stackable up to 80 kWh. LFP chemistry. 15-year warranty. Native integration with Enphase microinverter solar systems.

The battery chemistry used in modern home storage (Powerwall 3, Enphase IQ 5P). Safer than older NMC chemistry (much higher thermal runaway temperature), longer cycle life (~6,000+ full cycles), more eco-friendly. Tradeoff is slightly lower energy density (larger physical size per kWh).

California rebate program for residential battery storage in SCE, PG&E, and SDG&E territories. General market rebates range $150-$200/kWh; Equity Resiliency budget rebates can exceed $1,000/kWh for medically-dependent households or homes in High Fire Threat Districts (common in Palisades, Altadena post-2025 fires).

Whole-home backup powers your entire electrical panel during an outage (requires battery with sufficient continuous output — Powerwall 3 at 11.5 kW handles most LA homes). Critical-loads backup uses a sub-panel to power only essential circuits (fridge, lights, WiFi, medical equipment), allowing a smaller battery.

Pre-emptive utility-initiated power outages during high fire risk weather (Santa Ana winds + low humidity + high temperatures). SCE territory experiences multiple PSPS events per year in fire-prone areas. Battery + solar is the primary defense.

A reversible refrigeration system that moves heat in either direction — cooling in summer, heating in winter. Modern heat pumps (Daikin Fit, Bosch IDS, Mitsubishi M-Series, Trane XV20i) deliver 200-400% efficiency (vs gas furnace ~85-95%) because they move heat rather than generate it.

The updated 2023+ cooling efficiency rating for residential HVAC systems. Higher = more efficient. Minimum allowed in California is SEER2 15. Premium heat pumps reach SEER2 21-26. Each SEER2 point increase reduces cooling cost roughly 7%.

The updated 2023+ heating efficiency rating for heat pumps. Higher = more efficient. Premium heat pumps reach HSPF2 9-11. HSPF2 is essentially “BTU heat delivered per kWh consumed.”

A compressor that modulates output (typically 30%-100%) rather than running full-blast or off. Result: lower energy consumption, better humidity control, quieter operation, longer equipment life. All premium heat pumps use variable-speed compressors.

The ACCA-certified room-by-room heating and cooling load analysis used to right-size HVAC equipment. A proper Manual J considers home insulation, window count/type, climate zone, infiltration rate, and occupant count. Most LA contractors skip Manual J and oversize by 30-50%. Home Upgrade Specialist runs Manual J on every install.

A heat pump system where the outdoor unit connects to wall-mounted indoor units via refrigerant lines (no ductwork). Ideal for room additions, garages, ADUs, or homes without existing ducts. Mitsubishi M-Series and Daikin Quaternity are leading mini-split brands.

HVAC equipment specifically engineered for salt-air corrosion environments (Santa Monica, Pacific Palisades, Manhattan Beach, Redondo, Malibu). Includes marine-grade aluminum coil coatings, stainless hardware, and powder-coated cabinets. Standard equipment lifespan in coastal LA drops 20-30% without coastal-rating.

Solar-generating roof tiles (vs panels mounted on a conventional roof). Comparable cost to premium asphalt + premium solar installed together. 25-year tile warranty + 25-year power warranty. Installed by Tesla Certified Premium Installers.

Roofing systems with high solar reflectance (typically >0.65 reflectance) that reduce attic temperatures and HVAC load. Required by California Title 24 on most new residential roofs. Certainteed Landmark Solaris and Owens Corning Duration COOL are leading cool-roof shingle options.

Roofing installed with future solar in mind: properly spaced rafters, electrical conduit pre-run from attic to electrical panel, and a structural rating that supports the additional load. Saves $2,000-$5,000 vs retrofitting solar onto an existing roof.

240V residential EV charger that adds 25-40 miles of range per hour of charging. Tesla Wall Connector (Tesla cars) and Universal Level 2 chargers (J1772 plug for non-Tesla EVs) are the two common types. Installation typically requires 40-amp circuit and panel capacity verification.

Replacement of an electrical service panel (typically 100A or 125A) with a larger panel (typically 200A or 225A) to support EV chargers, heat pumps, and battery interconnection. Many pre-1985 LA homes need a panel upgrade before they can install EV + solar + heat pump.

The municipal utility serving the City of Los Angeles (most of central, west, and northeast LA). LADWP customers operate under their own net metering rules (more favorable than IOU NEM 3.0) and have access to LADWP solar incentives, EV charger rebates, and heat pump water heater rebates.

The City of LA’s permitting authority for residential construction, including HVAC changeouts, solar installations, panel upgrades, roofing, and battery storage. LADBS operates an expedited fire-rebuild permitting track for homes affected by the Palisades and Eaton fires.

The investor-owned utility serving most of LA County outside LADWP territory (parts of Pasadena, Burbank, Glendale, San Fernando Valley, South Bay, and Long Beach). SCE customers operate under NEM 3.0 and qualify for SGIP battery rebates.

The three municipal utilities serving specific LA cities: PWP (Pasadena Water and Power), GWP (Glendale Water and Power), and BWP (Burbank Water and Power). Each runs its own net metering rules and rebate programs separate from LADWP and SCE.

The natural gas utility serving most of LA. Critical for the Heat Pump Water Heater rebate (up to $3,800) — the biggest single utility rebate available to most LA homeowners.

California’s Building Energy Efficiency Standards. The 2022 edition (effective 2023) requires new residential roofs to meet cool-roof reflectance standards and new homes to be “solar-ready.” The 2025 edition further tightens HVAC efficiency requirements and pushes heat pump adoption.