I recently invested in one of these: http://www.solartechnology.co.uk/products/Solar_chargers/freeloader.asp
It works like a dream when it's sunny, but it's not so good in cloudy weather! Surely some some clever dick could combine the two and build a product that could take advantage of both sources of renewable power? =)
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Why not combine with some solar cells?
I recently invested in one of these: http://www.solartechnology.co.uk/products/Solar_chargers/freeloader.asp
It works like a dream when it's sunny, but it's not so good in cloudy weather! Surely some some clever dick could combine the two and build a product that could take advantage of both sources of renewable power? =)