Solar Calculator: Free Solar Savings & System Size Calculator

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☀ Free Solar Calculators

Solar Wise Tools

Calculate solar system size, panel requirements, savings, payback period, ROI and battery needs with our easy-to-use solar calculators.

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Solar Savings Estimate your savings
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System Size Find required kW
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Battery Size Estimate battery capacity
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Electric Bill Analyze electricity cost

Solar Savings Calculator

Enter your electricity and solar information below.

Solar Savings Calculator

Estimate system size, annual savings and payback period.

Typical US range: about 3–6 hours

Your Solar Estimate

Recommended Solar System —
Estimated Panels —
Annual Usage —
Solar Production —
Annual Savings —
Tax Credit —
Net Cost —
Payback Period —
25-Year Savings —

All Solar Tools

Simple tools for homeowners planning solar energy.

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Solar System Size Calculator

Estimate the solar system size needed to cover your household electricity consumption.

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Solar Payback Calculator

Estimate how many years it may take for solar savings to recover the investment.

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Solar ROI Calculator

Estimate the long-term return from a residential solar installation.

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Solar Battery Calculator

Estimate battery storage capacity based on daily electricity consumption.

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Electricity Bill Calculator

Estimate monthly electricity costs from your energy consumption and utility rate.

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Solar Panel Calculator

Estimate the number of solar panels required for your target system size.

How Solar Calculators Work

Solar calculations use your electricity consumption, utility rate, available sunlight, system efficiency, panel wattage and installation cost to create an approximate solar estimate.

Actual solar production and financial results can vary depending on location, roof orientation, shading, utility rules, equipment and installation prices.

What You Can Calculate

✓ Recommended system size
✓ Estimated solar panels
✓ Annual energy production
✓ Estimated electricity savings
✓ Solar installation payback
✓ Battery storage requirements

Solar Calculator FAQ

Common questions about solar calculations.

The number depends on electricity consumption, sunlight, panel wattage and system efficiency. A larger home with higher electricity usage generally requires a larger solar system.
Payback depends on installation cost, electricity prices, solar production, incentives and annual energy savings. Use the calculator above for an estimate based on your inputs.
No. They are planning estimates. A professional solar installer should perform a site-specific assessment before purchasing or installing a system.
Peak sun hours represent the equivalent number of hours per day when solar irradiance averages around 1,000 watts per square meter. The value varies by location and season.
Yes. The calculator uses general assumptions and dollar-based inputs, so it can be used for an initial residential solar estimate in the United States.

Solar Wise Tools

Free solar calculators and educational tools designed to help homeowners understand solar system sizing, energy savings, battery storage and solar investment.

© 2026 Solar Wise Tools. For educational and planning purposes only. Results are estimates and should not be considered professional financial or engineering advice.

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