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Originally posted by dmsuse
solar is the best and cheapest way
make sure you only buy a monocrystalline panel not Amorphous panel which is what you bought (they dont work)
buy a 20w panel - $55 ebay
a 12v charge controller - $10 ebay
grab an old car battery - free
buy a cigarette lighter usb adaptor 12v incar - $2 ebay
and 12v Female Car Cigar Cigarette Lighter Socket Plug Connector - $3
// cost $70
free charging for multiple phones and possibly other devices for the rest of your life.