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Add a Solar Panel to Keep Your Backup Battery Topped Up...

Generators are noisy and smelly, and they can be expensive. A simple backup power system that uses a battery costs much less. It won't run a fridge -- but it will keep your mobile devices charged, and it can also be used as an emergency car starter. Of course, the battery's own life is limited, but you can add a solar panel to the system to keep your gadgets charged indefinitely. Here...