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Old 01-24-2014, 02:18 PM   #1
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Separate battery charger

Gonna be camping for a month and plan on running my portable gen maybe 4-5 hrs a day. When the rv is pluged into the gen can I also plug an external battery charger from the gen to the rv battery to give it extra charge or will it feed back to the rv?
Rock
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Old 01-24-2014, 02:27 PM   #2
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The extra will help for a bit then feed back to the converter which will see the "battery" as nearing full charge and reduce output, as will the charger you are using externally see the converter as a "battery" nearing full charge but to a lesser degree depending on how many amps your charger has vs what the converter is putting out. I would either charge batteries using the generator/charger combo OR the converter, running off the gen output. If you can either wire the batts so you can take one offline, charge it alone, then (electrically) put it back then do the other batt (assuming you have two) might be the best method. Simplest of course is use the converter.
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Old 01-25-2014, 11:18 AM   #3
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Sounds like catch 22. I will have two so the second will charge seperately. Any idea on how many amps the converter puts out.
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Old 01-25-2014, 11:43 AM   #4
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Depends on the model. What converter do you have?

I have a completely separate system for drycamping using a high output temp compensated charger.

The problem with the stock converters, if you actually monitor their amperage rate, is that they taper off REALLY fast, and don't perform anywhere near their max charging spec. I don't have a PDI converter, as frequently recommend on this forum, but I imagine that they perform better than the WFCO units that are usually stock.
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Old 01-25-2014, 12:12 PM   #5
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You could install a battery cut off switch to use when charging. The battery will charge to full charge and you will be able to use all the items in the camper. The converter will run any of the 12 volt items when disconnected from the battery.
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Old 01-25-2014, 12:22 PM   #6
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You can hook up your external battery charger and just shut your converter at breaker supply (open breaker in ac panel).....
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Old 01-25-2014, 01:14 PM   #7
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Quote:
Originally Posted by rocksride View Post
Sounds like catch 22. I will have two so the second will charge seperately. Any idea on how many amps the converter puts out.
More then likely you have a WFCO 55 amp charger installed. If you want to do what you have said, change your disconnect so you can use A or B or both. Then just do one at a time. You might be able to disconnect them both as wire and then charge your batteries. Your convertor will keep the 12V working not sending any juice to them. At least I think that would work. The easiest is to upgrade to a 70 amp progressive. If you need to charge then just press the wizard to supply 14.4 volts, to 80% charge then it will drop to 13.6 to finish off the full charge then it will drop to 13.2 float. At any time you can press the wizard to bring you back up then it will do the rest. The 70 amp will fit in the same place as the WFCO. You would charge faster on the generator.
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Old 01-25-2014, 01:32 PM   #8
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When I have my external charger on the battery and the generator powering the camper, I use the battery disconnect switch to isolate the battery from the camper's converter.

My external charger has a "smart" 4 stage charger manager and I don't want to confuse it with a 13+ volt battery voltage coming from the converter. That will put the external charger in float mode instead of allowing it to go to "bulk" or desulphate (stage 4).
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Old 01-25-2014, 11:30 PM   #9
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Ok. That is what I will do just disconnect the battery. I was not sure if that would mess up the converter charger if the battery was disconnected while the RV power was pluged in. Just got my RV an am trying to figure the cob charger system out. I have a 30 ft boat and the water an a few other things r pretty much the same. I like to know how everything works do when it does not I know how to troubleshoot an fix. I will be remotely located 30 days so pretty muck have to get all systems figured out. Tks for all the Insite. Rock
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Old 01-26-2014, 09:18 PM   #10
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what charger do you have that is a 4 stage with a definitive desulphate mode?
Quote:
Originally Posted by herk7769 View Post
When I have my external charger on the battery and the generator powering the camper, I use the battery disconnect switch to isolate the battery from the camper's converter.

My external charger has a "smart" 4 stage charger manager and I don't want to confuse it with a 13+ volt battery voltage coming from the converter. That will put the external charger in float mode instead of allowing it to go to "bulk" or desulphate (stage 4).
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