PV Gap

Angela Said:

How do you calculate the annual output from a photovoltaic array?

We Answered:

You will never be able to calculate this precisely There are too many variables. For instance:

The efficiency of the panels, their rated output, whatever degree of fogginess hading there might be, the amount of shading, how often the panels are cleaned, the efficiency of the inverters, and whether you have batteries.

Perhaps you can find insolation (this is spelled correctly) tables on the Internet. Knock off 15 or 20 percent of that figure, and you will be as close as you can guess it.

Also look on the Internet and in the search box near the top of this page to learn more to help you make solar decisions.