Solar EV Charging Savings Calculator (2026)
Estimate how much solar it takes to charge your EV at home, what the added panels cost in 2026, and your payback vs grid and gasoline.
Estimate scope & data quality
- SEO Quick Estimate Uses the inputs available in this calculator.
- Personalized Estimate Use your own bill and location information where this calculator supports it.
- Detailed Solar Economics NOT_COMPUTABLE here without a verified tariff, system design, quote, and eligibility record.
- Data quality
- NOT_AVAILABLE
- Result limitation
- Calculator output is not a source-complete customer result.
A tariff credit is distinct from annual savings. If a result is NOT_COMPUTABLE or CONFLICT, it must not be replaced with an estimate or treated as canonical.
How to use this calculator
- Enter your monthly EV miles and your EV's efficiency in miles per kWh (from the vehicle specs or trip computer).
- Enter your grid electricity rate and peak sun hours, or use the state selector (US average: 18.19¢/kWh, EIA, July 2026 year-to-date; site average 4.5 sun hours).
- Pick your net-metering situation so exported solar is valued realistically (0.75 is the US blended average).
- Adjust the installed price per watt ($3.00/W default) and add any state or utility rebate in dollars; there is no federal solar credit for 2026 installs.
- Add your gas price and current car's MPG to see how solar-charged driving compares with gasoline.
Understanding your results
Short answer: Charging a 12,000-mile-a-year EV (3.5 mi/kWh) takes about 3,429 kWh a year. Covering that with solar at 4.5 peak sun hours needs roughly 2.5 kW more capacity (about 7 panels), which costs about $7,600 at $3.00/W in 2026. At 18.19¢/kWh (EIA, July 2026 year-to-date) and a 0.75 bill offset, that adds about $468 a year in savings, so the added panels pay back in about 16.2 years.
How the calculator works: EV energy = annual miles ÷ efficiency (mi/kWh). Added solar size = EV kWh ÷ (peak sun hours × 365 × 0.82), where 0.82 covers system losses. Installed cost = kW × 1,000 × price per watt − any rebate you enter. Year-1 savings = EV kWh × grid rate × bill offset. Payback = net cost ÷ year-1 savings. The 25-year figure assumes 3% annual rate increases and 0.5% annual panel degradation, the same model used on every page of this site.
Why the bill offset matters: Most EVs charge overnight, when panels produce nothing. Under full-retail net metering (offset 0.87), daytime exports bank credits for nighttime charging almost one-for-one. Under net billing (0.70), low-export rules such as California NEM 3.0 (0.60), or with no statewide net metering (0.55), shifting charging into the 10am–3pm window, or adding a battery, is what keeps the value high.
Solar-charged miles vs gasoline: Spread over 25 years, a $3.00/W system at 4.5 sun hours produces power for about 9.5¢/kWh (about 6.5¢ at 6.5 sun hours, the Arizona average), compared with the 18.19¢/kWh US average grid rate. In the default example, gasoline costs about $1,300 a year (30 MPG at $3.25/gal), grid charging costs about $624, and solar-backed charging cuts the remaining charging bill to about $156.
2026 federal policy: There is no federal credit for new EVs or used EVs acquired after Sep 30, 2025 (§30D and §25E ended), and no residential solar credit for systems installed after Dec 31, 2025 (§25D ended under the One Big Beautiful Bill Act, Public Law 119-21, signed July 4, 2025). The §30C charger credit ended for chargers placed in service after Jun 30, 2026. Some states and utilities still offer EV, charger or solar rebates, so check your state energy office or DSIRE and enter any amount you qualify for. Sources: IRS OBBB FAQs; EIA (rates); NREL PVWatts (production). This is not tax advice; confirm with a tax professional.
Frequently asked questions
Direct answers for US homeowners.
Related guides
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