How Many Solar Panels in Iowa?
A typical Iowa household using 10,500 kWh a year needs about 21 panels — a 8.4 kW system. That is 1 more than the national average.
Panels needed
21
28 of 51 states, fewest first
System size
8.4 kW
Roof space
378 sq ft
Peak sun hours
4.3 / day
Based on 400W panels and 10,500 kWh a year. Your own bill will differ — put your figure into the calculator.
What drives the number in Iowa
At 4.3 peak sun hours a day, Iowa sits close to the national average. Each kilowatt delivers about 1,256 kWh a year.
Roof space is usually the binding constraint rather than budget. The 378 square feet above is usable south-facing area — chimneys, vents, dormers and north-facing slopes do not count towards it.
How long would that system take to pay for itself in Iowa? →