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Old 11-07-2014, 04:30 PM   #1
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Wire batteries in a series

My Wildcat 5th wheel came with one 12v battery. Due to not having a problem with what I thought was a bad battery, I now have another 12v battery. I thought that I would go ahead and wire them in a series to extend the battery life. So am I correct that to wire 2 batteries in a series and maintain a 12v feed into the trailer I want to wire positive to positive and negative to negative?
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Old 11-07-2014, 04:33 PM   #2
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Quote:
Originally Posted by jonrjen View Post
My Wildcat 5th wheel came with one 12v battery. Due to not having a problem with what I thought was a bad battery, I now have another 12v battery. I thought that I would go ahead and wire them in a series to extend the battery life. So am I correct that to wire 2 batteries in a series and maintain a 12v feed into the trailer I want to wire positive to positive and negative to negative?
Thanks
Yes, wire them in parallel if they are both 12v. Putting them in series would give you 24v. That is correct, positive to positive.
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Old 11-07-2014, 06:11 PM   #3
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Note if are putting two batteries together they should start out equal - don't use a new battery with an older battery.
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Old 11-07-2014, 06:24 PM   #4
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Old 11-07-2014, 06:52 PM   #5
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Like Ham Bone said in his photo, it is important to connect the lines from the camper to different batteries AND the interconnecting wires must be exactly alike in length a gauge.

Here is why:
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File Type: pdf How to correctly interconnect multiple batteries to form one larger bank.pdf (106.1 KB, 38 views)
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Old 11-07-2014, 06:59 PM   #6
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Thank you all. Confirmed what I had meant to say and taught me some new information along the way.

I case you haven't heard it today, you are all good people.
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Old 11-07-2014, 09:50 PM   #7
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Do NOT wire them in series. Then you get 24 Volts on all your DC system and will damage most of it. Wire them in parallel (pos to pos and neg to neg).

When we first got our rig it had one very tired house battery. I measured up the battery tray, then went to Costco to look at their deep-cycle batteries. I found that two of them would fit just fine and were less than $40 each (some years back and memory is a bit vague). I hooked them up in parallel, and four and a half years later they're as strong as ever for our rig's next owner.
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