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Solar ROI Calculator

Calculate the payback period, 25-year savings, and return on investment for a solar panel installation.

System Details

System Size (kW)

Total System Cost ($)

Federal Tax Credit (%)

Electricity Rate ($/kWh)

Peak Sun Hours/Day

Annual Rate Increase (%)

Payback Period

years

25-Year Savings

Financial Summary

Net Cost (after credit)

Monthly Savings (Yr 1)

Annual Production

25-Year ROI

Cost per Watt

Tax Credit

About This Calculator

Solar production is estimated at system size (kW) x peak sun hours x 365 days x 0.80 (system efficiency factor). Payback accounts for the federal ITC tax credit and annual electricity rate increases. Panel degradation of 0.5% per year is included in 25-year projections.