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Old 05-09-2017, 02:30 PM   #1
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Battery question

Hi, haven't posted in a while but out enjoying our '19!
So we just picked up our trailer after being in winter storage & found batteries won't hold charge and need to replace. We ordered 2 from our local place & they gave us 12v by mistake. Will have to wait a day to get 6v in, which is cutting it close as we leave Thursday morning.
Question is, could we use the 2 12's, hooking up parallel, instead of the 6's in serial?? If Yes, would there be anything we would need to do other than hook up & go? How does trailer know which battery to use?
Any answers are appreciated as we're pretty ignorant here!....thanks, Karen
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Old 05-09-2017, 02:37 PM   #2
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Two 12v hooked in parallel is fine as long as they are both new and similar amp hours. You may have to recalibrate your solar as 2x6 hooked in series is treated as one 12v battery. see here for wiring..The 12volt Side of Life (Part 1)
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Old 05-09-2017, 02:40 PM   #3
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Jump staring a car is also hooking up two 12volts.
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Old 05-09-2017, 02:44 PM   #4
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Yes, but first make sure the 12v are true deep cycle (golf cart type) batteries not just automotive. Assuming you know how to wire for parallel you will need to measure the lengths for at least one new cable. Look up "The 12 Volt Side of Life Part One - marxrv.com" for a description and diagram.
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Old 05-09-2017, 02:45 PM   #5
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The weight of two 12V will be significantly more and you'll likely need new battery box too. I would just tell your supplier you don't want the batteries and go to another battery supplier. Must be dozen in your area that sell 6V deep cycle batteries.
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Old 05-09-2017, 02:50 PM   #6
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I always thought the 6 volt batteries would be heavier due to the thicker lead plates?
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Old 05-09-2017, 02:57 PM   #7
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This would be a good time to consider the AGM type batteries. They are much more expensive but no hassle with refilling the water, you can draw them down much lower and they recharge more efficiently. Trojan and Lifeline are two major brands but there are many others.
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Old 05-09-2017, 03:05 PM   #8
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We all seem to be forgetting the main issue here, why did 2 year old batteries go dead? If there is a short, new batteries may well be a waste of money until the cause of the problem is solved.
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Old 05-09-2017, 03:20 PM   #9
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California trailer too, so doubtful freezing was the issue. Wonder if low on water and not fully charged during lengthy storage? Plus there's those pesky tiny battery drains that can happen unless the disconnect switch is flipped.
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Old 05-09-2017, 03:22 PM   #10
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Quote:
Originally Posted by cpaharley2008 View Post
We all seem to be forgetting the main issue here, why did 2 year old batteries go dead? If there is a short, new batteries may well be a waste of money until the cause of the problem is solved.
That is the issue. My original 2014 factory 12v battery is still in good shape.

I do use two 12v batteries separated by a battery switch. I like always having one in reserve.

Ron
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