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Old 03-03-2012, 01:50 PM   #1
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battery charging question

In order to charge batteries more quickly and efficiently when dry camping, would it be acceptable to run the generator (Onan 4.0 KW) and use an external three-stage charger plugged into one of the 110V outlets? Under this condition, the batteries would be receiving a charge from both the onboard converter/charger and the external charger. I have a 2011 Sunseeker with a three-stage converter/charger.

I am not sure if this setup would overload the system or cause any related problems. If anyone is using this technique, does it result in a substantial shortening of the charging time compared to using the onboard converter/charger alone?

Any info would be appreciated.

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Old 03-03-2012, 05:37 PM   #2
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What you described is how I do it. The converter in my TT only charges the battery with a trickle charge. It takes for ever to charge and then it is not enough to fully charge a battery. I just use a Schumacher 3 stage charger that can charge at 20 amps. You will not over load anything.


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Old 03-03-2012, 06:32 PM   #3
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Thanks for the information. I didnít think it would be a problem, but wasnít sure.

Could you give me some idea how long you have to run the generator to fully charge your batteries using that method when they are somewhere around 20% discharged (80% of the charge remaining). I know it depends on such things as how many batteries are involved and their condition. I have two relatively new group 29 batteries and am curious how much generator run time would be required to bring them back up to charge using a 20 amp charger.

Thanks again for the input regarding your use of the method I was discussing.
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