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Indeed, because they do work quite well. I have a CD case sized panel and I charge my phone with it in normal daylight. It pumps out about 500ma in bright sun so takes about 2 hours to charge my G1. For better utility these are cool too http://cgi.ebay.co.uk/Solar-Power-Battery-Charger-for-iPod-N...

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I've bought two solar chargers in the past, and neither worked on my iPhone, although they did work on other phones. The way I understand it, the 300-500mA output of this and other compact solar devices just doesn't cut the mustard with the iPhones, which have a current requirement above standard USB specs. If I'm wrong, and/or you know of a pocket-sized solar charger that'll do the trick, do let me know.

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