The purpose is not to buy extra stuff, to use recycled materials or lowest cost possible to get MORE POWER!NRG!!So this is an example of how much you can gain with a little cardboard and foil.Simple solar concentrator construction.Also, its foldable so you can have a lot of power that can be carried...By: chrisayad
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from Instructables: exploring http://www.instructables.com/id/Increasing-solar-cell-efficiency/
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