Solar ROI Calculator
Know exactly what your solar investment returns — production in kWh, annual savings, payback year, 25-year net savings, and your CO₂ impact. The numbers are more compelling than the marketing.
Your System Details
Annual Production
15.2 MWh
Year 1
Year 1 Savings
$1,974
Payback: 11 years
25-Year Net Savings
$26,498
After full system cost
CO₂ Offset
138.1 tonnes
≈ planting 6,574 trees
25-Year Cumulative Net Savings
Assumes 0.5%/year panel degradation and flat electricity rate of $0.13/kWh. Actual results vary.
How this calculator works
- • Annual production = system kW × peak sun hours (by state) × 365 days × 0.80 performance ratio
- • Annual savings = annual production × your electricity rate
- • Payback year = net cost (after incentives) ÷ annual savings
- • 25-year projection uses 0.5%/year panel degradation (industry standard)
- • CO₂ offset based on US average grid emission factor of 0.386 kg CO₂/kWh
Results are estimates. Actual production varies with shading, weather, and equipment performance. See our methodology for full calculation details.