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If you will be Boondocking for an extended time and are worried about needing to recharge your batteries, invest in an automotive battery charger. Trying to recharge your battery from the generator or RV motor is slow and possibly harmful to your batteries. The generator (if it is wired to charge the battery) is very slow. They usually do not have any means to stop charging one the battery is full and can boil a battery dry rendering it useless. Using the RV motor is not very efficient. The best way is to run the generator and plug your battery charger into an RV electrical outlet. The charger is designed to bring a battery up to full charge and then trickle charge to top off the battery but not boil it dry.