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I use two cheap solar panels (A5-paper size, folding ones) on bike trips, one without a battery and one with. I have both installed on my bike all day, with my GPS device plugged in to one of them ...
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I use two cheap solar panels (A5-paper size, folding ones) on bike trips, one without a battery and one with. I have both installed on my bike all day, with my GPS device plugged in to one of them ...