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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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Old 01-29-2015, 05:23 PM   #11
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Bring your batts to full charge, then put a trickle charger on one of them since there connected, and shut your converter off. I look at it this way. Two batteries have enough buffer to allow the trickle charger to keep them topped off. Full charged batteries are much less likely to freeze (if a concern) and since electrical devices all have a given life, why burn up your longevity over the winter months on the more expensive converter. Just sayin'
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Old 01-29-2015, 05:28 PM   #12
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Once I'm connected to shore power should I turn my battery disconnect switch to off?
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Old 01-29-2015, 05:33 PM   #13
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Check your specific unit, but usually turning it off isolates your batteries from being charged by the converter. Think about it this way. The converter changes the 110v to 12v and sends it to the batts.While also keeping your 110 outlets energized for use. Assumed your question was while camping, correct?
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Old 01-29-2015, 05:44 PM   #14
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Yes, and you're reply makes sense. Thanks.
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Old 02-01-2015, 11:44 AM   #15
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I pull my batteries (2 - 12 gels) every winter and move them into the garage. I wire them both to a battery tender and in parallel.. Plug in the tender and leave it until May..
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Old 02-01-2015, 11:51 AM   #16
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Quote:
Originally Posted by MOJO3150 View Post
Yes, and you're reply makes sense. Thanks.
And oh yes, check your cell water levels monthly.
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