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Old 01-22-2021, 01:49 PM   #1
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House 12v AGM to 6V GC conversion

I am going to do this spring, just doing the planning ahead thing now.
The factory Napa batteries are 12/12/13 time to replace. I am going to replace with Interstate GC-HD-AGM 201 AH. I am going with 6 in the house bay and possibly 2 more in the chassis bay under steps. My question is, has anyone done this of which I'm sure, what is there a recommended wiring diagram. All the 6V to 12V I have done over the years were just 2 6V, I wouldn't think any different for 3 banks of 2 6v. I don't have coach home, I see from diagrams there are 2 Pos and 2 Neg connections of have to go on end of last bank, same if 2 more from under steps.
Will there be a need to change charge profile? It has the Magnum ME2012.

I am trying to find dimensions of battery tray, Winnebago says 625mm x 600.5mm or 24 39/64" x 23 41/64. the 12V group 31 battery is 13" long, so he may have looked up incorrectly. The part number I found 176574-03-02B, I can not find any size specs.
Thanx in advance of your replys.
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Old 01-25-2021, 03:13 PM   #2
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The connection of House cables is what I am looking for insight to, 2 positive and 2 negative cables from frame side. I am thinking ones that are longer to center and other 2 to most inside to distribute loads.
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Old 02-27-2021, 03:08 PM   #3
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Looking at changing to AGM batteries 12v though.
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Old 02-27-2021, 03:14 PM   #4
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Have 12v AGM's now, more amp hrs with 6v GC's. Have 4 12v AGM's now, going with 8 6v AGM's, 6 in battery bay and 2 more under steps.
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Old 02-27-2021, 07:09 PM   #5
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Quote:
Originally Posted by MacGyver612 View Post
Have 12v AGM's now, more amp hrs with 6v GC's. Have 4 12v AGM's now, going with 8 6v AGM's, 6 in battery bay and 2 more under steps.
Need to compare batty specs...
6V vs 12V not necessarily more AHs... don't forget two 6V in series adds V only A does not add.
Two 12V in parallel adds AHs V remains 12V
If you are going from 4 to 6 or 8 battys you will get more AHs whether 6V or 12V
I've looked at AGM banks and a pair or four 12V GP31s are actually a little more AHs than a pair or 4 GCs but very close to same unless you go to a premium$ higher AH GC.
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Old 02-27-2021, 09:10 PM   #6
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The present 12v AGM's are 105ah and the interstate gc 6v AGM's are 230ah. With the present 12v agm 420ah 4 6v gc agm 460ah. I know there are many agm batteries, I can buy wholesale so saving a fair amount. Even if had to pay retail, I would so the same thing. Didn't want to make the big jump to the super premium higher buck ones. The thought is the gc agm can take a little more abuse than 12v agm, not that is be doing that intentionally. Still looking at both sides, 12v agm vs 6v gc agm. Open for ideas on the subject. Thanx for the input.
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Old 02-28-2021, 06:29 PM   #7
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I asked East Penn about performance difference between 6V GC and 12V GP 31 - both AGM.
They confirmed both were equal for both deep cycle and starting (other than small differences in speced AH and CCA).
Apparently the AGM do not have different plate designs (# & thickness) like FLAs do. You will notice many AGM battys spec both AH and CCA unlike FLA that frequently will only spec one or the other.
I think all AGMs will do well in a rough service environment as the plates are fully supported by the glass mat separator material. Unlike FLA where the thicker plates provide ruggedness and space under plates allows sediment w/o shorting. The "starved" electrolyte w AGM precludes the sediment at the bottom.
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Old 02-28-2021, 07:44 PM   #8
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Thanks, Winemaker2
I'll look at my Interstate catalog and look at spec's and call my supplier on the 31agm ah spec's. I think when it come downs to it the 6v gc might win over for ah and cost vs the 12v 31agm..
They are close though, 6v agm 880 ah $1458 vs 12v agm 800 ah $1692
Thanx
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