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It is such a simple work that won't take up too much of your time and energy. First make your wires into a parallel circuit. Then different circuit get different rechargers. Last each circuit has a switch. Once there is one circuit out of power,one will take place.Like this around around......

Built it yourself if you have the time and energy! There are guild books on this stuff available on the net.I have many links myself but have no access to it for time being. Resort to experts in this field whenever you run into trouble.