Solar Payback Calculator

What this does

A solar payback calculator works out how many years a system takes to pay for itself from its net cost, yearly production, and electricity rate, plus lifetime savings and ROI.

How to use it

1. Enter the system cost and incentives.
2. Enter annual production in kWh.
3. Enter your electricity rate.
4. Read the payback years and ROI.

How it works

This is a simple payback that ignores rate inflation, panel degradation, and the time value of money, so real payback is usually a little faster.

payback = net cost ÷ (annual kWh × rate)

Understanding your result

This is a simple payback that ignores rising electricity rates, slow panel degradation, and the time value of money, so the real break-even is usually a little sooner because grid prices climb. The single biggest driver is your electricity rate: the more you pay the grid, the faster solar pays back, and every year after that runs close to free power.

Example

A $15,000 net system saving $1,800 a year pays back in about 8 years.