Budgeting & Income
Solar Panel Payback Calculator
Solar is a prepayment on electricity you have not used yet. Whether it pays depends less on the panels than on two numbers: what you paid after incentives, and how fast your utility raises its rates.
Installed price before any credit or rebate.
Federal credit plus state, local, or utility rebates you will actually receive.
How much of your usage the system covers. The average US home uses about 10,800 kWh a year.
US residential rates have risen roughly 2–4% a year over the long run.
Most panel warranties run 25 years.
Pays for itself in
9
Years, counting rising electricity prices.
- Net cost after incentives
- $16,800
- First-year saving
- $1,870
- Net saving over 25 years
- $51,379
Total electricity avoided, minus what the system cost.
How this calculator works
Net cost = system cost − incentives. First-year saving = kWh offset × price per kWh. Each following year's saving grows by the rate increase, and we accumulate until the total covers the net cost. The horizon figure is cumulative savings minus the net cost.
Production is held constant and maintenance, inverter replacement (typically once in 25 years), and financing interest are excluded. If you finance the system, compare the loan payment against the first-year saving as well.
Try an example
Frequently asked questions
How long does solar take to pay off?
Commonly six to twelve years in the US, though it swings widely. High electricity prices and strong incentives can pull it under six; cheap power, heavy shading, or a small credit can push it past fifteen. The calculation above uses your own numbers rather than a national average.
Why do rising electricity rates matter?
Because the savings are denominated in avoided kilowatt-hours, not dollars. If rates climb 3% a year, the same panels save more every year — and the later years carry most of the return. It is also the part of the forecast you control least, so it is worth testing a lower figure.
What about panel degradation?
Panels lose roughly 0.5% of output a year, so a 25-year-old system produces around 85–88% of its original power. This model holds production flat, which slightly flatters long horizons — a conservative kWh figure offsets it.
Does solar add to my home's value?
Owned systems generally do; leased systems can complicate a sale because the contract has to transfer. That resale value is not counted here, so a purchased system's true return is somewhat better than the payback figure alone suggests.
Related calculators
Payback Period Calculator
Find how long it takes to recoup an upfront investment from its annual cash flow — the simple payback period, in years and months.
Cost of a Habit Calculator
What is that daily coffee, takeout, or subscription really costing you? See the monthly and yearly total — and what the same money could grow to if invested.
NPV Calculator
Calculate the net present value of an investment with level annual cash flows — whether the future returns, discounted to today, justify the upfront cost.
EV vs Gas Car Cost Calculator
Compare what electricity costs against gasoline for the same miles, and find out how long a higher EV sticker price takes to pay back in fuel savings.
Disclaimer: DayCents provides this calculator for educational purposes only. Results are estimates based on your inputs and the stated assumptions — they are not financial advice, a quote, or an offer of credit. Consult a qualified financial professional before making major money decisions.