I looked into them two years ago for a backpacking trip to Patagonia for charging cell phones and cameras. The conclusion was that I was better off carrying extra batteries or a power bank. The output from a panel you can carry is limited and charging time is limited unless you're in one place for most of the day. Hanging them on a backpack just doesn't expose them to the sun enough to be very effective.Any suggestions for a lightweight backpacking solar charger?
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