SolarSavingsHQ
Free solar ROI calculator with NEM 3.0 battery modeling
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SolarSavingsHQ is a free, client-side solar and battery payback calculator. It estimates system size, applies the 30% Federal Tax Credit (IRC §25D), models California NEM 3.0 battery arbitrage, and projects 25-year utility savings using NREL PVWatts v8 standards.
The tool includes a 12-month D3 solar irradiance intensity heatmap for detailed site analysis. All calculations run locally in your browser with no data sent to external servers.
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