Yes there is! Although, you need great knowledges in this type of field. You can buy inexpensive blemished and damaged solar cells from ebay. You can buy some bricks of 3×6 mono-crystalline solar cells. You need 36 of these in order for it to work. They would make up 18 volts which is perfect for charging 12 volt batteries. Use a solar panel can be used by a solar box, most people just buld the box themselves. (you can use a cork board). Cut the two pieces of board and add a plexiglass in the front. Use the low wattage soldering iron and fine rosen-core solder. Use the rosen pen on the solder points on the back of the cells before adding all the parts. For instructions on how to instruct this solar energy check out the citation.
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