Solar panels really aren't a big secret. A set of 4 Kyocera panels to recharge a 48volt vehicle would usually be regulated to put out about a max of 5 amps. While 5 may not seem like a lot, an on board charger is usually capped about 15-18 amps. This means you would not use solar for a total recharge is you drive a lot, but overall, solar will do a good maintenance job. You would still want to use the electrical charger every so oftern to maintain the batteries.
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