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Bunnings had some solar charger panels which will keep a battery topped. Designed for car\boat use. About $30 over here in NZ. Tie one to the top of your cart. You may be able to find an automotive voltage reg that normally plugs into the Cig lighter plug and has an adjustable voltage output. Used to have one somewhere but can't find it now. Put out 5 v, 6v, 8v, 9v or similar with slide switch on the side to select.
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