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I happen to have a gas powered battery charger that will put out up to 70amps at 12 volts. Can I charge my trailer batteries while they are still hooked up to the converter? Or do I need to isolate the converter from the batteries before I connect the external charger to the batteries?

Pat
 

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From everything that I've read it is not necessary to disconnect the batteries when charging. However I wouldn't hook up the shore power cord at the same time, and if you want you could flip the converter breaker to the converter while charging. When I return home from a trip I generally remove the negative connection, and deep cycle charge my batteries, I don't reconnect the battery until we leave on our next trip or use the camper.

I checked the two battery FAQs and couldn't find anything about needed to disconnect the batteries while charging.
 
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