Solar Panel Payback Calculator

Electricity rates historically tend to rise over time, so a solar system that saves you a fixed amount of electricity generates growing dollar savings each year as grid electricity prices increase — the calculator models this using your specified annual rate-increase percentage applied to the previous year's savings.

Enter your net out-of-pocket cost after any applicable rebates, tax credits (like a federal solar tax credit), or utility incentives — not the gross sticker price of the system — since payback period should be measured against what you actually paid.

Solar systems have real ongoing costs — inverter replacement over the system's lifetime, occasional cleaning, and monitoring — so subtracting an annual maintenance estimate from your savings gives a more realistic net payback timeline than assuming zero ongoing costs.

Once cumulative savings exceed the system cost, every year afterward is pure savings (the system has "paid for itself") for the remainder of its typical 25-30 year lifespan — the year-by-year table continues showing cumulative totals through year 25 so you can see the full long-term financial picture, not just the breakeven point.