System Sizing

How many panels and how many kilowatts you need for your home and electricity use.

Guides

How Many Solar Panels Do I Need in 2026?

Divide your annual kWh by local sun hours × 365 × 0.80, then by 0.4 kW per panel. A typical U.S. home needs 15–25 panels (6–10 kW); a $150 bill needs about 20.

Updated July 6, 2026