I came up with this idea after a friend gave me two B/P 40watt solar panel and a 800 watt AC converter. I wanted to build something portable so I decided to build it on a wagon. I managed to score 14 batteries (12 volt Lithium 12amp/hr) from the GE guy who came to the hospital to change the batteries in our x-ray room. The 20amp controller has usb ports for charging devices, and the whole thing took about seven hours to build. Works great for a small, portable, solar wagon!
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