Free solar calculators. Size your system, estimate the cost after the 30% federal tax credit, and see your payback period and lifetime savings versus your power bill.
Run the numbers before the sales pitch.
System price by size, $/watt and the 30% tax credit.
Open calculator →Payback period and lifetime savings vs your power bill.
Open calculator →The kW system your home actually needs.
Open calculator →Your 30% federal residential solar credit.
Open calculator →Installers are great at monthly-payment math and quiet about payback. These tools size your system from your actual usage, apply the 30% federal credit, and show the years until solar pays for itself and the lifetime savings after that.