Can Solar Panels Power a Whole House?
Short answer: yes — solar can offset a whole home’s electricity use, air conditioning included, when the array is sized to your consumption and roof. But “power the whole house” means four different things, and the answer changes for each. Getting them straight is the difference between a system that works and a disappointing one.
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“Can solar power my whole house?” really means one of these — and they have different answers:
- Offset my yearly use? Yes, with a system sized to your consumption and roof.
- Run every load at once? Depends on system + inverter size; usually fine for a home, tight for big simultaneous loads.
- Run the whole home at night or in an outage? That needs a battery, sized to your loads.
- Live fully off-grid? Possible but expensive and rare for a connected LA home.
The most common meaning: offsetting your yearly use
For most homeowners, “power my whole house” means producing roughly as many kilowatt-hours over a year as the home consumes. Under the Net Billing Tariff, that does not mean a zero bill: exported energy and imported energy are valued differently, and fixed charges remain. Offsetting most of your annual usage, however, is very achievable in sunny LA. The average California residential customer uses about 6,040 kWh a year (EIA, 2024), though a detached home with central AC, a pool or an EV can use substantially more. Size the array to your usage, and it can offset the whole year.
How big a system?
A simple LA rule of thumb: in Los Angeles, each 1 kW of panels produces roughly 1,700 kWh a year (NREL-based). So divide your annual use by ~1,700 to get an approximate system size. A home using 7,000 kWh/year needs roughly a 4–5 kW system; a 12,000 kWh all-electric home with AC and an EV, closer to 7 kW. Your roof, orientation and shading set the real limit.
Size solar to your whole-house usage
Enter your yearly electricity use (or monthly bill). The tool sizes a system to offset your annual consumption in LA conditions. Note what it does not do: it doesn’t size a battery to run your home at night or in an outage — that’s a separate calculation.
Whole-house solar sizing
Offsetting your yearly use (not a backup calculator).
Assumptions: LA modeled production ~1,700 kWh per kW per year (NREL-based); 400 W modules; bill converted at ~33¢/kWh (a very rough conversion — fixed charges and time-of-use rates distort it, so prefer entering annual kWh from your last 12 bills). Planning estimate for annual offset, not a quote; real design depends on roof orientation, tilt and shading. Battery/backup sizing is separate.
Running your AC on solar
Yes — and here’s the nuance. Central AC is a big load (~3,000–5,000 W running), and it runs hardest on hot afternoons and evenings. During sunny hours, the array may offset part or all of the AC’s instantaneous draw, depending on array and inverter output at that moment. In the evening peak, when the sun is fading but it’s still hot, that power comes from the grid or a battery. So solar covers your AC over the year; a properly sized battery can supply part or all of the AC load after the sun goes down, subject to its power, energy and surge limits. See heat and solar output.
Annual offset vs. running the house 24/7
Sizing solar to offset your yearly use is one problem — the calculator above. Keeping the whole house running after sunset or during an outage is a completely separate one: it’s about battery capacity and power, driven by which loads you need and for how long. A battery is not required just to offset annual use on a grid-tied system; it’s required for nighttime independence and backup. Size that with our backup load builder.
Whole-house is not the same as off-grid
Powering your whole house with solar almost never means cutting the utility cord. Nearly all LA homes stay grid-tied: they generate roughly their annual usage, use the grid or a battery at night, and lean on the grid as backup. True off-grid typically needs a large battery bank, often a backup generator, and careful design — costly and rarely worth it where the grid is available. See grid-tied vs off-grid vs hybrid.
What this means for an LA homeowner
Size to your real usage
Pull your annual kWh from your bills and size to that — not to a generic “average.” See how many panels you need.
Decide night/backup separately
If you want the house to run after dark or through outages, that’s a battery decision on top of the solar sizing — don’t conflate them.
Watch the AC and evening peak
Under time-of-use and NEM 3.0, running AC in the 4–9 p.m. peak is where a battery earns its keep. See SCE TOU plans.
Sources & methodology
Primary and authoritative sources for this page: EIA — Electric Power Annual, Table 2.8 (residential sales & customers) · DOE — Homeowner's Guide to Going Solar (sizing) · NREL — PVWatts (production per kW). Figures and program statuses are current as of publication — verify time-sensitive items (rates, tariffs, incentive budgets) on the official source before relying on them.
Frequently asked
Can solar panels power an entire house?
Yes — a system sized to your consumption and roof can offset a whole home’s annual electricity use, air conditioning included. What that doesn’t automatically do is run the house after sunset or during an outage — that requires a battery. So “power the whole house” is really two problems: annual solar sizing, and separate battery sizing.
How many solar panels to power a whole house in California?
It depends on your usage. In LA, each 1 kW of panels makes roughly 1,700 kWh a year, so divide your annual kWh by ~1,700 for an approximate system size. The average California residential customer uses about 6,040 kWh/year (EIA, 2024) — a ~3.5–4 kW system — but a home with central AC, a pool or an EV needs more. See how many panels you need.
Can solar panels run air conditioning?
Yes. Central AC draws ~3,000–5,000 W running; during the day your panels can power it directly. The catch is the evening, when it’s hot but the sun is low — then the power comes from the grid or a battery. Solar covers your AC over the year; a properly sized battery can supply part or all of the AC load after dark, subject to its power, energy and surge limits.
Do I need a battery to power my whole house with solar?
Not to offset your annual use — a grid-tied system does that without one. You need a battery to run the home at night on your own solar or to keep power during an outage. Size it to the loads you actually want to carry with our backup load builder.
Can solar make my house fully off-grid?
Technically yes, but it’s rarely worth it for a connected LA home. Off-grid needs a large battery bank, often a backup generator, and careful design, at much higher cost. Nearly all homes stay grid-tied and use the grid as backup. See grid-tied vs off-grid vs hybrid.
Related reading
Cover your year — and your nights
Get a system sized to your actual usage, with battery and backup handled as their own step. Ask a licensed local installer for an itemized design.
Get a free estimatePrepared by Cali Energy, August 2026. This article is for general educational purposes only and is not legal, tax, financial, engineering, or utility advice. Rates, incentives, codes, permit requirements, equipment specifications, prices, and program terms may change; figures and timelines are estimates, not guarantees. Confirm current requirements with the applicable utility, AHJ, program administrator, manufacturer, or a licensed professional. See our Content Disclaimer. Cali Energy · 19201 Parthenia St Unit E, Northridge, CA 91324 · CSLB #1032379 (B, C-10, C-39)