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Old 01-27-2015, 09:57 PM   #1
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Charging 2 12v batteries in parallel

Is it a good idea to charge two 12 volt batteries wires in parallel at the same time or should I charge them separately? Want to keep them charged while RV is in storage.
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Old 01-27-2015, 10:24 PM   #2
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Look at it this way, your converter charges them exactly like that, so that fine.
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Old 01-27-2015, 11:08 PM   #3
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Our converter has been charging our parallel 12v batteries like clockwork, for over 7 years now.
see no reason to pull them out.
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Old 01-28-2015, 12:10 AM   #4
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Thank you. I knew that is how the charging occurs in the RV, Just wondering if my charger could do the same.
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Old 01-28-2015, 02:02 PM   #5
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Charging batteries

Thank you for asking and answering the post. Now I have a question regarding batteries. Do you leave batteries on the charger 24/7?
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Old 01-28-2015, 03:49 PM   #6
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Once they are 100% charged...disconnect them and forget about them for at least a couple of months. They will SELF discharge at roughly 10-15% a month at room temperature...higher in hot...lower in cold. So you should have at LEAST 3 months before you have to charge 'em up again while always staying above a 50% charge which is necessary for maximum life cycles.
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Old 01-28-2015, 03:59 PM   #7
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Few caveats :

If you do not have a battery shutoff switch, your discharge rate will be higher due to parasitic loads in the RV ( CO/Propane detector, TV etc) .
When charging in parallel the batteries should be close to the same age.
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Old 01-28-2015, 05:27 PM   #8
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If the batteries are parallel and in the camper, they should be the same age and brand and size. If one should go bad it drains the other one. If only charging it is ok.
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Old 01-28-2015, 06:32 PM   #9
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You can leave a battery tender on them, no problems. Don't leave a conventional charger on them.
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Old 01-29-2015, 04:55 PM   #10
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It seems to me I read somewhere where you have two batteries connected in parallel, one seems to lag behind the other a bit and so its good to swap them them so the 2nd battery is connected or charged first occasionally. I might be just making this stuff up but I think I remember this being a topic of conversations once on a forum.
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