Solar Panel Payback Calculator
Solar pays for itself over time through lower electricity bills, but the payback period decides whether it is worth it for you. Enter your install cost and annual savings to see the break-even point.
Note: A rough estimate that approximates rising energy prices. Maintenance, panel degradation, and incentives also affect real payback.
How this calculator works
Payback is the point where your accumulated electricity savings equal what you paid to install the panels. The calculator divides your total install cost by your annual saving, then nudges the result down slightly to reflect that energy prices tend to rise over time, which makes each future year of savings worth a little more. The result is the approximate number of years until the system has paid for itself.
Worked example
An $8,000 installation that saves $1,200 a year would naively pay back in 6.7 years. Allowing for energy prices rising about 4% a year, the effective payback shortens to roughly 6.5 years. After that point, the savings are money in your pocket.
Frequently asked questions
What counts as the annual saving?
It is the value of the electricity you no longer buy from the grid, plus any payments you receive for exporting surplus power. Check a recent bill and any export tariff to estimate it.
Does this include panel degradation?
No. Panels lose a small amount of output each year, typically under 1%, which slightly lengthens real payback. This calculator gives a close approximation rather than an exact figure.
Do grants or tax credits change the result?
Yes — subtract any upfront grant or credit from the installation cost before entering it, and the payback period will shorten accordingly.