one big or 2 small AGM batteries??

Submitted: Tuesday, Feb 03, 2009 at 13:27
ThreadID: 65663 Views:2517 Replies:5 FollowUps:2
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Hi guys,

I have a GU ute which has a start battery under the bonnet and 2 x deep cycle batteries under the tray to run fridge, lights, winch, etc.
I am looking at replacing the 2 batteries under the tray and have been looking at the Fullriver AGM's. Am i best to go with a single Fullriver DC260 which is a 260Ah or two Fullriver HGL120-12b's which are 120Ah each.
Physically, the DC260 is smaller than two HGL120's and has more Ah- so i would think this is the better option but i am no expert on this.
the price difference is negligent.
any thoughts would be appreciated.
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Reply By: Member - Alastair D (NSW) - Tuesday, Feb 03, 2009 at 13:56

Tuesday, Feb 03, 2009 at 13:56
My preference would be for the 2.
1. It is unlikely that both would fail at the same time so you have some redundancy.
2. The big one will be very heavy to lift.
3. Weight balance and the stress on the mounting point.
AnswerID: 347385

Follow Up By: TerraFirma - Tuesday, Feb 03, 2009 at 14:42

Tuesday, Feb 03, 2009 at 14:42
Yes I would agree with that and all those reasons, in fact I went with 3 x Fullriver 120's in a marine application for 360AH and they have been awesome.
FollowupID: 615562

Reply By: Motherhen - Tuesday, Feb 03, 2009 at 14:06

Tuesday, Feb 03, 2009 at 14:06
Hi Brett

We have recently replaced our caravan batteries with Full River 110 ahs. Anything much bigger would be too heavy to handle. Weights are on the species sheet on the Full River website. Depends on how easy it is to get the batteries in and out of your bracket under the tray and how strong you are!


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AnswerID: 347386

Follow Up By: RV Powerstream P/L - Tuesday, Feb 03, 2009 at 18:03

Tuesday, Feb 03, 2009 at 18:03
If I was using two batteries I would be more inclined to use 2x6Volt as they could give better capacity than 2x12V.
FollowupID: 615578

Reply By: Axel [ the real one ] - Tuesday, Feb 03, 2009 at 20:36

Tuesday, Feb 03, 2009 at 20:36
Brett ,, the DC260 is a DEEP cycle AGM ,, the HGL120s are also a AGM but NOT a full deep cycle , the HGL is a hybrid that stands between a starting battery and a deepcycle ,they can be used as a starting batt without compromising their life span ,, the whole thing comes down to your usage and weight allowance/size area ,, if it was me I would go for the 120s , mainly because I have / used the Fullriver HGLs for the last 5+yrs as Starter and Aux. with never a problem..
AnswerID: 347432

Reply By: Maîneÿ (wa) has - Wednesday, Feb 04, 2009 at 10:05

Wednesday, Feb 04, 2009 at 10:05
if your choice is 'only' as you have stated for whatever choice then use the single DEEP CYCLE 260ah battery (DC260)

Mainey . . .
AnswerID: 347490

Reply By: Sigmund - Wednesday, Feb 04, 2009 at 13:22

Wednesday, Feb 04, 2009 at 13:22
FWIW, I'm getting my camper trailer wired by an experienced guy and had been thinking about one big aux batt. The guy recommended 2 smaller ones wired in parallel to get the same amp hours. Don't ask me the reasoning; I couldn't understand it but part of it was about better weight distribution.
AnswerID: 347506

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