Construction & Architecture / Solar & Energy
Solar Panel ROI Calculator
Solar System Details
Current Electricity
Incentives
The 30% federal credit ended for systems installed after Dec 31, 2025. Leave at 0 unless your system was installed by then.
How to Use This Calculator
Calculate the return on investment for solar panels over 25 years, including any tax credit, state incentives, and rising electricity rates. Production assumes 75% of the panels' rated output after wiring, inverter and heat losses, falling 0.5% a year. Your monthly bill caps the savings at the electricity you actually use; leave it blank to count every kWh at the retail rate.
Key Factors:
- The 30% federal residential solar credit ended for systems installed after December 31, 2025; check state and utility rebates instead
- U.S. residential electricity prices have risen about 3% a year on average since 2000
- Solar panels are warrantied for 25+ years
- Inverter may need replacement around year 15 ($1,500-$3,000)
Use this solar panel roi calculator to compute solar & energy results from your inputs.