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01-27-2015, 09:57 PM
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#1
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Jeffco, MO
Join Date: Jan 2012
Location: Cedar Hill, MO
Posts: 143
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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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Mary & Ted
2016 Silverback 33IK
2015 GMC Sierra 2500HD CrewCab Diesel/Super Glide Hitch
Days camped 09 -53, 10 -56, 11 -57, 12 - 55, 13 - 46, 14 - 50, 15 - 60, 16 -32
7 FROG Rallies (Goshen(4), Charleston, Amana(2))
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01-27-2015, 10:24 PM
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#2
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Senior Member
Join Date: Mar 2014
Posts: 1,748
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Look at it this way, your converter charges them exactly like that, so that fine.
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01-27-2015, 11:08 PM
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#3
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Site Team
Join Date: Jan 2007
Location: Goodyear, Arizona
Posts: 33,802
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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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Dan-Retired California Firefighter/EMT
Shawn-Musician/Entrepreneur/Wine Expert
and Zoe the Wonder Dog(R.I.P.) 
2016 PrimeTime TracerAIR 255, pushing a 2014 Ford F150 SCREW XTR 4x4 3.5 Ecoboost w/Max Tow Package
4pt Equal-i-zer WDH and 1828lbs of payload capacity
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01-28-2015, 12:10 AM
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#4
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Jeffco, MO
Join Date: Jan 2012
Location: Cedar Hill, MO
Posts: 143
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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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Mary & Ted
2016 Silverback 33IK
2015 GMC Sierra 2500HD CrewCab Diesel/Super Glide Hitch
Days camped 09 -53, 10 -56, 11 -57, 12 - 55, 13 - 46, 14 - 50, 15 - 60, 16 -32
7 FROG Rallies (Goshen(4), Charleston, Amana(2))
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01-28-2015, 02:02 PM
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#5
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Junior Member
Join Date: Aug 2013
Location: Tucson
Posts: 4
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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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01-28-2015, 03:49 PM
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#6
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Senior Member
Join Date: Feb 2014
Posts: 2,832
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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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Cam
2015 Georgetown 280DS
2019 Vespa Primavera 150's (pair)
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01-28-2015, 03:59 PM
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#7
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Site Team
Join Date: Oct 2014
Posts: 15,294
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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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2015 Freedom Express 248RBS
TV 2015 Silverado HD2500 Duramax
TST Tire Monitors
Honda 2000I + Companion
2 100W solar panels
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01-28-2015, 05:27 PM
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#8
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Senior Member
Join Date: Aug 2012
Posts: 331
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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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01-28-2015, 06:32 PM
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#9
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Roger and Paula
Join Date: Aug 2013
Location: Port Charlotte, FL
Posts: 108
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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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01-29-2015, 04:55 PM
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#10
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Senior Gold Member
Join Date: Jul 2014
Location: Winnipeg
Posts: 213
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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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rthomaslyons
2019 Sunseeker 3010 DSF
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01-29-2015, 05:23 PM
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#11
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Senior Member
Join Date: Mar 2014
Posts: 1,748
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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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01-29-2015, 05:28 PM
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#12
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Junior Member
Join Date: Dec 2014
Posts: 10
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Once I'm connected to shore power should I turn my battery disconnect switch to off?
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01-29-2015, 05:33 PM
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#13
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Senior Member
Join Date: Mar 2014
Posts: 1,748
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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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01-29-2015, 05:44 PM
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#14
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Junior Member
Join Date: Dec 2014
Posts: 10
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Yes, and you're reply makes sense. Thanks.
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02-01-2015, 11:44 AM
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#15
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Senior Member
Join Date: Aug 2013
Location: Pincher Creek, AB
Posts: 854
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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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TV: 2020 GMC 2500HD 4x4
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02-01-2015, 11:51 AM
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#16
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Senior Member
Join Date: Dec 2011
Posts: 3,570
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Quote:
Originally Posted by MOJO3150
Yes, and you're reply makes sense. Thanks.
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And oh yes, check your cell water levels monthly.
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