
I have also tried out the solar charger and battery combination I was experimenting with lately. It's an old alarm battery from work connected to a small solar charger. So now I've a proper 12V system and can charge anything with a usual car charger. Charges the iphone in less than three hours. Not sure how long the solar thing needs to top up the battery after that, but shouldn't be longer than the iphone takes to run flat again.

Oh, and here's the video.
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