I bought a 12V portable fan from Walmart for , removed the case, and mounted into a piece of plywood. It was then put into the gable end vent, and connected to a 15 Watt Harbor Freight solar panel. No regulator or timer needed. When the sun is up, the fan is running. This video was taken about 5 PM, and the fan has already slowed down some. During the peak of the day, it moves a fair amount of air. Also shown in the video is the powered vent fan (120VAC) that was replaced by my inexpensive solar setup.
Keywords: DIY, solar, attic, fan, gable, vent, harbor, freight, 15, watt
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