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 - sun and collector illustration
Solar modules should be installed at the correct 'tilt-angle' to achieve the best year-round performance. Generally, this is an angle equal to the site's latitude plus 20°, with modules facing south in the northern latitudes and north in the southern latitudes.