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Free solar calculators
A small suite of honest, no-signup tools to help you make smart solar and energy decisions.
Solar Savings Calculator
Estimate your system size, cost, payback period, and 25-year savings from your bill and state. Updated for 2026.
Solar Battery Cost Calculator
What a home battery costs after incentives — and how long it backs up your essentials in an outage.
EV Home Charging Cost
The real monthly cost to charge an electric car at home in your state, plus savings vs a gas car.
Lease vs. Buy vs. Loan
Compare the 25-year net savings of paying cash, financing, or leasing the same solar system.
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Solar & home energy gear
Once you know your numbers, see our curated, well-reviewed picks — portable power stations, home energy monitors, Level 2 EV chargers, and panel-cleaning kits.