Solar Payback Period Calculator
Find out how many years it takes for your solar panels to pay for themselves.
Calculate your payback period
Your payback results
Year by year payback
Each year your savings grow with electricity prices, minus maintenance. The highlighted row is the year your cumulative savings pass the system cost.
How solar payback works
This free calculator works out how long it takes for bill savings to repay a solar system. It is for homeowners comparing quotes or deciding whether solar is worth it. It is free, needs no sign-up, and runs entirely in your browser.
What is the solar payback period?
The payback period is the time it takes for electricity bill savings to add up to what you paid for your solar system after incentives. If a system costs $12,600 after the tax credit and saves $120 a month, simple payback is 8.75 years. After that point, the electricity your panels produce is effectively free, apart from small maintenance costs.
How is simple payback calculated?
Divide the net system cost by yearly net savings. Yearly net savings are monthly savings times 12, minus yearly maintenance. For example, $12,600 divided by $1,440 a year gives 8.75 years. This simple method ignores rising electricity prices, so it is a useful starting point, but the year by year table above gives a more realistic answer.
How do rising electricity prices change payback?
Electricity prices in the United States have risen by roughly 3 percent a year on average over the past decade, according to the US Energy Information Administration. When prices rise, each kilowatt hour your panels produce is worth more, so yearly savings grow and payback arrives sooner. Enter your own expected rise above to see the effect.
With a 3 percent yearly rise, the test case above breaks even in about 8 years instead of 8.75, because savings in later years are worth more. Over 25 years the difference is large, which is why the simple figure alone understates the value of solar.
What counts as maintenance cost for solar panels?
Solar panels have no moving parts, so maintenance is usually low, often about $150 a year for cleaning and occasional checks, plus a possible inverter replacement after 10 to 15 years. Most panels carry a 25 year performance warranty. Budget a small yearly figure in the calculator so your payback estimate stays honest.
Is a payback under 10 years good?
Yes, a payback under 10 years is generally good for home solar, because panels are warrantied for 25 years, so you can enjoy 15 or more years of near free electricity after breaking even. A payback over 12 years is weaker and worth a second look at system size, price, and shade. Compare at least three quotes before you commit.
- Under 6 years. Excellent. High electricity prices, strong sun, or generous incentives are working in your favour.
- 6 to 10 years. Good. This is the normal range for most well sized home systems.
- 10 to 12 years. Fair. Worth checking a smaller system, a lower quote, or better panel placement.
- Over 12 years. Weak. Get more quotes and check shade, roof direction, and your real usage first.
Frequently asked questions
What is a good payback period for solar panels?
Most home systems pay back in 6 to 10 years. Under 10 years is generally good, because panels last 25 years or more, leaving 15 plus years of near free electricity after break-even.
Does the payback period include the tax credit?
Yes, if you enter the cost after incentives, as this calculator asks for. The 30 percent federal tax credit cuts the cost a lot, so it shortens payback by several years. Enter the gross cost and payback will look far longer.
How does a loan change the payback period?
A loan adds interest, which lengthens payback, but you still start saving from month one if your loan payment is lower than your old bill. Compare the loan payment with your monthly savings, not just the headline payback figure.
What happens after the payback period?
After break-even, the electricity your panels produce is effectively free apart from small maintenance costs. A system with an 8 year payback and a 25 year life gives about 17 years of savings after it has paid for itself.
Do solar panels still pay back in cloudy areas?
Yes, but more slowly. Panels still produce power on cloudy days, just less of it. In a cloudy area, a larger system or a higher electricity price can still give a payback under 10 years, so run your own numbers above.
Should I include a battery in the payback calculation?
Only if you are buying one. A battery adds several thousand dollars and usually lengthens payback, because it saves less than it costs in most areas. Size your panels first, then judge storage on backup value, not just payback.
Does this calculator store my data?
No. The calculator runs entirely in your browser. Nothing you type is uploaded, stored, or shared.
More tools you may need
Working out what a system costs in the first place? Use the Solar Panel Cost Calculator. Need the panel count? Try the How Many Solar Panels Do I Need Calculator. Planning storage or a bigger system? See the Solar Battery Size Calculator and the Solar System Size Calculator.
