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Old 04-13-2019, 09:11 AM   #1
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Needing New House Batteries

Its that time, my house batteries are not holding up. I have 2-12volt deep cycle group 27 batteries, is there any advantage to replace them with 2 group 31 deep cycle batteries. There is room in battery tray, they are 1/2"
longer. Thanks
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Old 04-13-2019, 09:28 AM   #2
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No group # is just a description of the case size.

Change group will not necessarily change the electrical property of the batteries.

If you were happy with the old capacity (AH) then you can just replace them with
equivalent AH deep cycle batteries. Of course there are different quality batteries as well.

You might want to consider AGM for the convince if you don't all ready have them.

If you want more capacity then you will have to study what is available that will fit. If you don't want to rewire be sure the post are in a place where your current cables will reach.
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Old 04-13-2019, 09:39 AM   #3
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The existing batteries are fine for are use, I thought the higher number meant more they would last longer before needing charging. Thanks
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Old 04-13-2019, 09:55 AM   #4
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The existing batteries are fine for are use, I thought the higher number meant more they would last longer before needing charging. Thanks
Larger battery typically DO hold more power and so at the same discharge rate they will last longer (205 min vs 160 min, for a pair 410 vs 320)

Despite what it the label says, there are very few is any TRUE deep charge 12V batteries. The ones that do exist are very expensive and typically only at golf cart distributor (likely special order) or solar power distributors.

A pair of 6V golf cart batteries (size GC2) will give you 395 minutes of reserve capacity and might even cost less (at Sams or Costco), but they will have a longer life ! Physically they are 10-3/8 x 7-3/16 x 10-5/8. They are wider than Group 27 so they may of may not fit your existing battery box/tray.
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Old 04-17-2019, 10:02 PM   #5
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Ditto on AGM 6v golf cart (GC2) batteries
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Old 04-20-2019, 04:07 PM   #6
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If I change to 6volt batteries, would I have to change my on board charger? thanks
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Old 04-20-2019, 04:34 PM   #7
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No. You hook up two 6 volt batteries in series to make one 12 volt battery.

No other changes.
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Old 04-21-2019, 08:43 AM   #8
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No. You hook up two 6 volt batteries in series to make one 12 volt battery.

No other changes.


Ok, is that where you connect positive from one battery to negative on other ?
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Old 04-21-2019, 09:01 AM   #9
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Ok, is that where you connect positive from one battery to negative on other ?
Yes.
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Old 04-27-2019, 12:13 PM   #10
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I'm happy with my 6v golf cart batteries. I got them for about 100/each at batteries plus. They require occasional maintenance but that's not a big deal. I hear Costco has them for a better price.
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