Never use an abrasive material to clean your solar panels. Doing so could cause them to become scratched and less useful than they were when they were installed. Your best bet is to have a gentle cleanser and cloth on hand to clean your panels so that you know that you have what you need when the time comes.
If after installing solar panels you find that you are producing more energy than you need, you can sell the extra energy that you produce back to the electric company. This method will help you recoup the cost of your solar energy system's installation and parts. Additionally, after you have recovered your costs, you will be making a profit.
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Know how light mixes with the trees around your property. You may think you've got the perfect spot for a solar panel, but watch it throughout the day. The sun coming in from different angles may lead to surprising shadows from trees and foliage. This will affect your solar output.