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The author of this video decided to build this to fight back at the electric company. "I live in Florida, and if there's one thing we have plenty of, it's sunshine. This unit was fun and inexpensive to build, it will run for years maintenance free and provide my hot water heater with pre-heated water, so that it will not have to work very hard (maybe not even at all) to get the water up to desired temperature. I used Google sketchup as a CAD program to design the frame and I'm willing to share with anyone that is interested, just send me your email address."