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Free solar calculators

A small suite of honest, no-signup tools to help you make smart solar and energy decisions.

Estimate your system size, cost after the 30% credit, payback, and 25-year savings from your bill and state.

What a home battery costs after incentives — and how long it backs up your essentials in an outage.

The real monthly cost to charge an electric car at home in your state, plus savings vs a gas car.

Compare the 25-year net savings of paying cash, financing, or leasing the same solar system.