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Old 01-26-2015, 06:25 PM   #1
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Wiring 4 group 27 in parallel

Hello all, I installed my 4 Trojan 27tmh deep cycle battery in the rv. My issue is, do the batteries need to be wired in a certain way? Example, the battery tray is 2 batteries front, and 2 batteries behind them. I do left front to left rear and right front to left rear and connect in a criss cross with cables.
The problem started because old cables were worn out. So I use a series of small 2 Guage cables to connect them. I had new battery cables made, and they will not make the bends that need to happen to parallel the batteries. Any ideas? I'd appreciate your input. Was also thinking about welding cable, and just having the things made again. Thanks, Chris
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Old 01-26-2015, 06:44 PM   #2
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your best bet is for all cables to be of the same length
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Old 01-26-2015, 06:58 PM   #3
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This should be what you are looking for.
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Old 01-26-2015, 07:01 PM   #4
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This is how mine are done. I made the cables to fit using 00 welding cable.
Sorry about the upside down pic. Only seems to do this when I post to this forum???
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Old 01-26-2015, 08:23 PM   #5
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Thanks Dennis for your reply. Mine are 12 volt, so the batteries are only in parallel. I'm just not sure if the batteries have to be wired in a certain sequence so only one battery is being used. Chris
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Old 01-26-2015, 08:27 PM   #6
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Pds47, thanks for your reply. Cable the same length? Do you mean 1 cable each for positive and negative? .. I went to using short jumpers because to remove the battery cables is a PITA. Thanks, Chris
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Old 01-26-2015, 08:39 PM   #7
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I've found that a good source for custom battery cables using welding cable is via a golf cart shop.
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Old 01-26-2015, 10:34 PM   #8
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Kix, thanks for your reply. That's a good idea. I had regular cables made, and they just couldn't make the bends necessary. So, it didn't work. Spent over $100 on cables I can't use. I tried to have the shop cut them down, but still would not work. Chris
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Old 01-27-2015, 12:33 AM   #9
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Copied from marksrv.com,
batteries are wired like this usually.
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Old 01-27-2015, 12:58 AM   #10
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Quote:
Originally Posted by dennis45 View Post
This is how mine are done. I made the cables to fit using 00 welding cable.
Sorry about the upside down pic. Only seems to do this when I post to this forum???
I was going to say that that looks like a Newmar then I read your sig!!
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Old 01-27-2015, 06:13 AM   #11
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Why does everyone keep sending 6 volt battery wiring plans? Tha OP has 4, 12 volt batteries!

You could pick up 2, 400 amp power posts or buss bars. Run your jumpers to them and then connect to your outgoing cables.
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Old 01-27-2015, 08:33 AM   #12
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Quote:
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Why does everyone keep sending 6 volt battery wiring plans? Tha OP has 4, 12 volt batteries!

You could pick up 2, 400 amp power posts or buss bars. Run your jumpers to them and then connect to your outgoing cables.
Left side of Ray's pic is all 12vdc but I think you can't answer the physical connection question without a picture of the tray and battery orientation. Basically, all the positives together and then all the negatives together. As suggested, buss bars or power posts make it simple.

https://www.bluesea.com/products/cat...ost_Connectors
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Old 01-27-2015, 08:47 AM   #13
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As long as we are talking short cables the answer is electrically there is no discernible difference. Throw a 20 ft cable in the mix and I might change my mind. ;-) Mechanically it might be a lot easier to alternate batteries. As long as it's electrically correct there is no problem.
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Old 01-27-2015, 08:48 AM   #14
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Thanks Dennis for your reply. Mine are 12 volt, so the batteries are only in parallel. I'm just not sure if the batteries have to be wired in a certain sequence so only one battery is being used. Chris
"so only one battery is being used"?????? Either I don't know as much as I think I do about parallel wiring, or "we" need to do some more research and develop a better understanding of what "we" are doing.

Am I reading this wrong??
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