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Old 12-08-2019, 10:43 PM   #1
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Which battery setup two 6v LA or 2x12 v AGM

I have a small 24ft class A with 135w solar and 4k generator built in. My two group 27 batteries died.
I will only have the RV about 2 years more max. I dry camp exclusively usually for 4 days at a time. I work 5 days on 12hr shifts followed 5 days off.
I can go for two group 31 or two CG2.
Sam's club has their Duracell brand batteries at good prices. I'm trying to see what is best.
1) Duracell 12v AGM "marine” for $160 each has a 20amp hour rating of 105 and 210 minutes at 25 amps. So 210 with two.

2) Duracell lead acid/flooded cell golf cart battery 6v, EGC2 for $125. 20 amp hour rating of 230, so still 230 with two in series. 448 minutes at 25 amps hours.


My thoughts:
Prices for 2 of each are close enough to not matter to me.
I'm not going to buy batteries for more than $160 each.im selling it in a couple seasons.
All my chargers, solar, and monitors support AGM.
I've heard AGM can do 80% DOD. BUT...THIS MARINE AGM has a cca rating and probably are not true deep cycle batteries. Perpahs.i should do 65% DOD. Thus capacities between the LA GC2 and AGM Group 31 are close.
Will the AGM die quickly if used as house battery even if AGM?

6v will not drian themselves due to being series wired.


My unknowns are the AGM DOD with non-deep cycle batteries if they not deep cycle. However, even at 65 to 70 DOD gives a lot of capacity over 6v golf.


https://www.samsclub.com/p/duracell-...gm/prod3590232


https://www.samsclub.com/p/duracell-...p_product_1_11

Thanks for your opinions.
Thanks.
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Old 12-08-2019, 10:50 PM   #2
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O-ya, AGM HAS 18 month warranty and 12month for golf. So if I kill an AGM before I sell the RV, the 18mo warranty would be nice.
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Old 12-09-2019, 08:43 AM   #3
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Flooded acid will have the same specs and may have a longer warrantee.

Flooded batteries tolerate partial re-charges better then AGM.

You will about get the same performance from either chemistry running them down to 80% DOD. About half the cycles of 50% DOD.

https://www.solar-electric.com/learn...tery-faq.html/

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Old 12-09-2019, 09:52 PM   #4
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Thanks. Imeaning towards 6v.
True deep cycle vs the 12v AGM.
Cheaper.
More capacity.
Work better in heat ( I'm in NM)


But AGM have better warranty from Sam's club of 18mo vs 12mo for 6v. That may be enough to sway me thoug.
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Old 12-09-2019, 10:16 PM   #5
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For your usage, you couldn't ruin a battery no matter how deeply you cycled it. Meaning, you won't be taking it out hundreds of times and discharging to 80% DOD within the next two years. Go for the 6V FLA, it's the most cost effective solution.

Mark B.
Albuquerque, NM
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Old 12-10-2019, 08:09 AM   #6
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Why not AGM GC 2?

https://marinehowto.com/wp-content/u...le-Battery.jpg
I would not consider anything but GCs for house especially when I look at the cost at Sam's Club.
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Old 12-10-2019, 11:40 PM   #7
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Quote:
Originally Posted by Winemaker2 View Post
Why not AGM GC 2?

https://marinehowto.com/wp-content/u...le-Battery.jpg
I would not consider anything but GCs for house especially when I look at the cost at Sam's Club.
I wish I could my friend, but...but the AGM 6v GC2 are only affordable at Sam's Club. However, I cannot find a Sam's that has them!!! They store item locator only works for one store at a time. And the Sam's I've called cannot search other stores. I've called 8 Sam's clubs and no one can find the item. But since I'm only going to keep it less than 2 years, I don't want to waste money on expensive 6v AGM.

https://www.samsclub.com/p/duracell-...gm/prod3870119
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Old 12-12-2019, 08:09 PM   #8
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Quote:
Originally Posted by Mark_K5LXP View Post
For your usage, you couldn't ruin a battery no matter how deeply you cycled it. Meaning, you won't be taking it out hundreds of times and discharging to 80% DOD within the next two years. Go for the 6V FLA, it's the most cost effective solution.

Mark B.
Albuquerque, NM

Logic wins....I'll be doing the 6v FL.
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Old 12-12-2019, 09:03 PM   #9
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By my crude math, drawing FLA's down to 70+% will prematurely kill your batteries several months after you sell.


Just sayin . . .
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Old 12-13-2019, 05:00 PM   #10
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Originally Posted by Bobby F View Post
By my crude math, drawing FLA's down to 70+% will prematurely kill your batteries several months after you sell.


Just sayin . . .
I won't do 70 DOD. My old group 27 FLA seemed to have enough capacity at 50 DOD for the past couple years, so doing 50 dod on two 6v with significantly more capacity, 50 DOD will surely be enough. Please don't call me Shirley.....
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Old 12-13-2019, 05:34 PM   #11
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Quote:
Originally Posted by serpa4 View Post
I have a small 24ft class A with 135w solar and 4k generator built in. My two group 27 batteries died.
I will only have the RV about 2 years more max. I dry camp exclusively usually for 4 days at a time. I work 5 days on 12hr shifts followed 5 days off.
I can go for two group 31 or two CG2.
Sam's club has their Duracell brand batteries at good prices. I'm trying to see what is best.
1) Duracell 12v AGM "marine” for $160 each has a 20amp hour rating of 105 and 210 minutes at 25 amps. So 210 with two.

2) Duracell lead acid/flooded cell golf cart battery 6v, EGC2 for $125. 20 amp hour rating of 230, so still 230 with two in series. 448 minutes at 25 amps hours.


My thoughts:
Prices for 2 of each are close enough to not matter to me.
I'm not going to buy batteries for more than $160 each.im selling it in a couple seasons.
All my chargers, solar, and monitors support AGM.
I've heard AGM can do 80% DOD. BUT...THIS MARINE AGM has a cca rating and probably are not true deep cycle batteries. Perpahs.i should do 65% DOD. Thus capacities between the LA GC2 and AGM Group 31 are close.
Will the AGM die quickly if used as house battery even if AGM?

6v will not drian themselves due to being series wired.


My unknowns are the AGM DOD with non-deep cycle batteries if they not deep cycle. However, even at 65 to 70 DOD gives a lot of capacity over 6v golf.


https://www.samsclub.com/p/duracell-...gm/prod3590232


https://www.samsclub.com/p/duracell-...p_product_1_11

Thanks for your opinions.
Thanks.
A couple of months ago I purchased two Duracell 6v for under a hundred each.
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Old 12-14-2019, 09:34 AM   #12
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Yep, those are also at Sam's Club. 90 bucks each. Their Duracell EGC2 are a little more than the Duracell GC2, but do have more capacity.
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