How many solar panels do I need to power my house?

Off my last electricity bill, I can see that I use 22.1kWh per day of energy. How do I use this number to calculate how many solar panels I need to power my house?

The size you need for your solar array depends not only on your typical electrical usage (which you already know), but on the climate (days of sunshine per year), roof angle, shade trees that may block some of the sun at certain times of day, and other factors.

Fortunate a dirty method was developed that lets you guestimate the size of the solar array you need. The calculation is surprisingly accurate.

To approximate the size of array you need, multiple your average daily electrical demain in kilowatt hours by 0.25

The result is the approximate size of solar array, in kilowatts, that you need to meet your electricity demands.

So in your case, take 22.1 x 0.25 = 5.525 so we round up to 6. This means you need 6, 1 kilowatt solar panels to power your home.

 

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