Solar offset calculator
Enter numbers from a recent bill to estimate the system size, cost, and payback for offsetting your electricity.
Results update as you type.
0 kWsystem size needed
$0saved per year
$0estimated system cost
0 yrssimple payback
Rough estimate only. Assumes 80% system efficiency, no battery, and the same rate for all usage. It ignores incentives, net metering rules, rate changes, and panel degradation.
How the estimate works
- System size = yearly usage x share to offset, divided by sun hours x 0.8 x 365.
- Yearly savings = the kWh you offset x your rate.
- Payback = estimated system cost divided by yearly savings.
Find your kWh use and rate on your utility bill. Peak sun hours depend on where you live, so check a solar resource map for your area.