Does anyone know how to make a 12v fan charge a battery?
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In a DC application, if the power is generated by a fan, then the positive would go to +, the negative line to the -. I would look up some solar generator set ups to see what they used to make sure a battery gets charged correctly. I know in those set ups, the power from solar goes into an inverter before going to the batteries. So that might be something to look into, buying or creating an inverter to charge your battery.