Many people view solar power as a free source of energy. They’re not entirely correct, but they’re not completely wrong either. You see, solar energy becomes free once you get returns from your investment. The expense of buying and setting up the equipment: panels, batteries, converters, controllers, inverters, et cetera. 

Because of the continuous price changes in solar equipment, it may take four to eight years before you see returns in your setup. Before, it was estimated that you need to at least wait two decades before the panels pay for themselves.