3rd battery question
Submitted: Tuesday, Jun 20, 2006 at 20:12
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Member - Crazie (VIC)
Hello my friends
Don't know about everyone else, but bleep ds its been a busy year.... Just when you get one 4wd sorted, you get another one and start all over again...
Putting a 3rd battery in and just wanted to know if a 3rd battery should be connected to the main or aux battery. The second is connected to the main via a battery management system, and have another dual battery manager for the 3rd, just need to know if there was a preference to which battery to hook it up to?
thanks
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Reply By: Sand Man (SA) - Tuesday, Jun 20, 2006 at 20:29
Tuesday, Jun 20, 2006 at 20:29
Ads,
Connect it to the auxiliary battery.
This will allow the initial charge to go to the starting battery, then the management system you refer to, will swap over to the auxiliary and any other battery (or circuit) connected to it.
I do the same with my Rig. I have an auxiliary AGM battery connected via a Piranha DBS controller, then another circuit from the auxilary battery terminals through a separate fuse and controller to an anderson connector in the rear of the Jack.
To this I connect the Thumper portable battery system to charge along with the auxiliary battery whilst travelling.
AnswerID:
179528
Follow Up By: Mbr - Taz & Milka-Queanbeyan - Tuesday, Jun 20, 2006 at 21:31
Tuesday, Jun 20, 2006 at 21:31
Hi Sand Man,
I am assuming that your cranking battery is not an AGM and I don't believe the Thumper is an AGM ( correct me if I am wrong ).
I read somewhere that it wasn't good to use AGM and non AGM on the same system especially in parallel.
From your description it would appear that you do use dissimilar batteries on one system. Can I also assume that you haven't encountered any problems with this setup ?
I am considering adding a standard battery as an aux to my cranking calcium to assist in winching operations and running 2 fridges on the road. I also want to put a 100ah AGM in the trailer and connect it in parallel with the aux via an anderson plug. What do you think ?
Cheers.....Taz
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Follow Up By: Sand Man (SA) - Tuesday, Jun 20, 2006 at 22:15
Tuesday, Jun 20, 2006 at 22:15
Hi Taz,
Yes, I have a mixture of batteries. The starting battery is an Exide Extreme (wet cell) while both the auxiliary battery (Exide Orbital) and the Thumper are both AGM batteries.
No problem with mixing types, at least not with the Piranha DBS150 smart controller.
You may have also read that it is not recommended that you put an AGM battery in the engine bay.
Well that's where
mine is and I haven't experienced a problem.
As far as your other query, I don't have a winch to worry about but I am of the understanding that a winch should be run from the starting battery and only when the engine is running, whilst other equipment such as fridges are best run from a deep cycle auxiliary battery, preferably an AGM type to provide quicker and more total recharge capability.
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Follow Up By: Member - Crazie (VIC) - Tuesday, Jun 20, 2006 at 22:44
Tuesday, Jun 20, 2006 at 22:44
hello Sandman
my 2nd and 3rd are deep cycle gel cyle/cranking batteries. I might put the extra management in as it will allow the 2nd battery to charge first before hooking up the 3rd.
thank mate
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FollowupID:
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Reply By: Alloy c/t - Tuesday, Jun 20, 2006 at 20:47
Tuesday, Jun 20, 2006 at 20:47
Crazie , am presently running a 5 batt system ,soon to be a 6 batt ,, currently start batt is a 80amp Fullriver AGM HGL and aux is same thru redarc copy ,[used to use a rotronics in previous vehicle ] ,3x 80amp Fullriver AGM HGL in camper trailer via anderson to under bonnet aux,... newer 6 batt system will simply add another 80 amp Fullriver AGM HGL under the bonnet for those times when we go away minus the c/t but take both our fridges [80lt Waeco ,15lt Engle] , new batt becomes aux 2 wired direct from current aux 1 , see no need for another batt controller.
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Follow Up By: Member - Crazie (VIC) - Tuesday, Jun 20, 2006 at 22:48
Tuesday, Jun 20, 2006 at 22:48
thats some
battery power.. just wonderif not having the second controller in will put too much strain on the 2nd bat.
thanks
Adam
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Follow Up By: Muzzgit (WA) - Tuesday, Jun 20, 2006 at 23:46
Tuesday, Jun 20, 2006 at 23:46
Crazie, I'm no auto leccy but my way of thinking is this......if both aux batteries are hooked together and used for a fridge etc, you will have almost double the running time [effectively acting like one big battery] and of course double the re-charge time, which could be a problem if you don't have the means to give them a full charge ie; being on the road every day, or having a battery charger.
On the other hand, using a third isolator could reduce your chances of re-charging the 3rd battery by quite a bit, assuming the isolator will only click in when the 2nd battery is over 12.5v [or thereabouts] which might take a few hours depending on how much its discharged !!!
Cheers,
Muzz
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