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Updated / CA residential estimate

California solar panel cost calculator

Estimate system size, panel count, gross cost, annual production, and savings using defaults for California. Enter an address or ZIP Code below to replace them with live location data.

Strong sun resource with high retail rates, but export compensation and utility rules vary materially.

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State data baseline

Planning sun hours
5.4 hours/dayState planning default used when API data is unavailable.
PVWatts annual yield
1,504 kWhPer 1 kW system at 20% loss. Solar resource: 5.87 kWh/m²/day; 17.2% capacity factor.
EIA residential rate
$0.3474/kWhLatest state average: 2026-06.
API baseline location
Sacramento, CA 95814, USA38.5778, -121.4942
Location APIGoogle Geocoding API
Electricity APIEIA Open Data API v2
Production APINLR PVWatts v8

Server-side API snapshot, refreshed monthly. All three providers returned external data.Data sources and update notes

Decision brief

What changes the decision in California

These state-specific checks are not included in a generic national quote. Resolve them before comparing payback claims. Supporting rules and official references are collected at the end of this page.

  1. 01Before you sign

    Model exports by time, not one retail-rate number

    The Solar Billing Plan uses time-varying export credits. A flat export input is only a planning shortcut, and battery timing can materially change value.

  2. 02Before you sign

    Check the mandatory disclosure package

    Ask for the current CSLB disclosure documents and Solar Consumer Protection Guide before interconnection paperwork is submitted.

  3. 03Before you sign

    Confirm property-tax timing

    Section 73 contains installation-date and ownership-change rules, including provisions tied to January 1, 2027. Verify qualification with the county assessor.

Verified state policy

What can reduce your cost in California

Review these 4 statewide or utility-level policy signals before comparing net cost. They are not automatically applied because eligibility, tax liability, utility territory, equipment, and program capacity can change.

Policy configuration verified .

Policy sources
Not statewide01
Broad state solar cash rebate

$0 statewide

California does not offer one broad cash rebate to every residential solar customer. Income-qualified and utility-specific programs may still apply.

Eligibility applies02
Solar property assessment exclusion

100% of qualifying added value

A qualifying system completed before January 1, 2027 does not increase the property's assessment. California treats this as a new-construction exclusion, not a general property-tax exemption.

Eligibility applies03
SGIP low-income solar and storage

$1,100/kWh storage + $3,100/kW solar

These listed equity rates require low-income eligibility, paired solar and storage, available program funds, and other SGIP conditions.

Eligibility applies04
Solar Billing Plan (NEM 3)

Hourly avoided-cost export credits

New customers of the major investor-owned utilities generally receive time-varying export credits rather than the full retail import rate.

Calculation walkthrough

How we calculate for California

A worked example using this page's baseline assumptions. Calculator results above change when you edit the inputs.

Baseline inputs

Illustrative 1,000 kWh/month household

Solar resource
5.150 peak sun hours/day
Modeled system loss
20% loss / 80% delivered
Household electricity use
12,000 kWh/year
Energy value
$0.3474 retail / $0.06 export
  1. 01

    Annual output per 1 kW

    Location and production losses

    5.150 h/day × 365 days × 80% delivered

    1,504 kWh/year

  2. 02

    Required system capacity

    Annual demand divided by output

    12,000 kWh ÷ 1,504 kWh per kW

    7.98 kW

  3. 03

    Energy-based panel count

    Rounded up; entered usable roof area can cap the result

    7.98 kW ÷ 0.4 kW per panel → round up

    20 panels

    8 kW

  4. 04

    Estimated first-year value

    Retail offset plus export credit

    12,000 kWh × $0.3474 + 29 kWh × $0.06

    $4,171/year

Model notes and limitationsSources and scope

Production baseline

NLR PVWatts v8 modeled a 1 kW array at 20° tilt and 180° azimuth for Sacramento, CA 95814, USA.

Energy valuation

Self-consumed production offsets the retail rate. Production above annual use is valued at the configured export rate; utility tariffs may use different timing or settlement rules.

Not included

Roof shading, structural conditions, hourly tariffs, financing, maintenance, incentives, and tax eligibility require separate verification.

California FAQ

Data updated: 2026-08-11. API baseline: Google Geocoding API, EIA Open Data API v2, and NLR PVWatts v8. Policy assumptions should be verified before purchase using the sources below.

Sources & verification

Review the original API, statute, regulator, or program documentation before relying on an estimate for a purchase, tax filing, or contract.

Data sources

Geocoding, residential electricity rates, and solar production inputs.

3 sources · Updated 2026-08-11

State rules

Official references behind the state-specific decision checks.

3 primary references

Incentives

Tax, rebate, and compensation sources used for policy summaries.

4 policy sources · Reviewed Aug 11, 2026