Solar Panel Calculator
Calculate how many solar panels you need and estimate your savings.
Solar Panel Calculator
Calculate solar panel requirements and savings
Formula
System Size = Daily Need ÷ (Sun Hours × Efficiency)Estimates panels needed, cost, and payback period
How to Use This Calculator
- 1
Enter usage
Enter your monthly electricity usage from your utility bill.
- 2
Set location factors
Enter average peak sun hours for your location.
- 3
Review costs
See system size, cost, and payback period.
Frequently Asked Questions
How many solar panels do I need?
A typical home needs 20-25 panels (8-10 kW system) to offset 100% of electricity usage.
What is the payback period for solar?
Most solar systems pay for themselves in 6-10 years, depending on electricity rates and incentives.
How many peak sun hours do I get?
The US averages 4-6 peak sun hours. Southwest states get 6+, while northern states get 3-4.