The Simple Math of Electrical Solar Power Systems

If you're evaluating solar power systems, here is a quick guide to help you calculate your energy useage and the number of solar modules and storage batteries needed to meet it.

solar power systems - hours of sunlight per day map
The map shows average hours of sunlight per day in Mexico, the U.S., and Canada, an essential fact when calculating the output of solar power systems. Keep in mind installations will also be affected by local weather patterns, which vary greatly even within a small geographical area.
ILLUSTRATION: SEIMANS SOLAR