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I put my panels on the outside of the railing of my deck not on my roof. They get just as much sun and are easily cleaned. I also use mirrors to reflect more light onto the
panels. I don't run the heat, air conditioning, or oven on the panels BUT everything else is run on them. I have a bank of 20 batteries mostly gel type. I get them from fire stations. Fire stations have to recycle their backup batteries EVERY year whether they are good or not. I pay between $10-$30 dollars each for them. The batteries can run all I mentioned for 3 days with solar assist. Hooking a windmill to the system would be a piece of cake. I am going to do just that in the spring.