California solar decisions
Solar panels in California: cost, size and bill comparison
The system price is only part of the decision. Put the solar equipment, battery, roof work and remaining electricity bill on separate lines. Then compare the total.
Updated September 11, 2026 · California Rate Relief is a private solar referral service.
How much do solar panels cost in California?
The useful number is the itemized price for your property. A price per watt becomes comparable only when the bids use the same scope. Roof repairs, electrical work and a battery can make a combined price look expensive even when the panel portion is similar.
For a solar-only quote, divide its cash price by the DC system size in watts. Keep the battery outside that calculation. The calculator below does this from your inputs; it does not insert a market-average price.
A historical California benchmark, not a current quote
Lawrence Berkeley National Laboratory's 2026 data update reports a median gross installed price of $3.30 per WDC for California host-owned, stand-alone residential solar systems installed in 2025. It is a historical benchmark in 2025 dollars, not a price promise for a new proposal.
The study's gross installed-price scope can include ancillary work or fees. Compare bids only after separating solar equipment, battery, roof work, electrical work and payment terms. A different scope can make the same price per watt mean something different.
Check the numbers in your bill and quote
Start with your electricity bill. If you have a quote, add its system size, cash price and remaining utility bill. Leave unknown values blank. After changing values, calculate again to update the optional inquiry.
How much solar does the house need?
Request a design based on a full year of electricity use, then account for a planned EV, heat pump or other load change. Have the proposal show monthly production, shading and losses. Buying more capacity is not automatically better when much of its output would be exported.
Model the remaining utility bill
Include energy bought from the grid, delivery and fixed charges, export credits and the actual generation provider. PG&E, SCE and SDG&E net billing differs from municipal utility programs. The quote should name the applicable schedule.
Cost and worth are different questions
A competitive quote can still be a poor fit for a shaded roof or a short ownership horizon. Read the worth-it decision guide, then compare cash, loan, lease and PPA obligations. No incentive is automatically deducted here; verify any claimed benefit before adding it to your comparison.
Put the quotes on the same basis
A smaller monthly payment can hide a longer contract, less equipment or a larger remaining electric bill. Ask each bidder to fill the same gaps.
| Compare | Get it in writing |
|---|---|
| System and output | Same DC system size, module/inverter models and roof layout; monthly production with shading and losses shown. |
| Battery and backup | Usable kWh, continuous output, backed-up circuits, reserve setting and expected replacement costs. |
| Price and scope | Separate solar, battery, roof, panel upgrade, permits and interconnection. Compare cash prices before financing. |
| Utility bill | Same usage history and tariff; separate onsite use, grid imports, export credits and remaining fixed/delivery charges. |
| Contract and service | Who installs and who services it; written coverage by address, insurance, license record, exclusions and warranty claim process. |
| Payment and transfer | Cash, loan, lease or PPA; upfront costs, APR or escalator, total payments, home-sale and end-of-term terms. |
Want to discuss your solar options?
Send your project details to California Rate Relief. We collect the information for a solar referral; the provider confirms availability, design and price. The calculator and checklist are yours to use without submitting.