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RE: solar panels (not cells) - expected costs would drop to the vicinity of $0.30 by the end of 2017
that means we can build a usb charger for your usb phone or even small laptop for less than 1.6$
or maybe less than 5$ including battery and all the necessary component's very easy and with a magic light lamp with this!!
remember some led lights also use only 5 watts to light your room!
saving lots of money!