Submitted: Sunday, Jun 26, 2005 at 10:32
ThreadID: 24192 Views:1595 Replies:4 FollowUps:1
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Hi All. Does anyone use two 12v batteries in parallel in a c/t or van? If so do you
have any problems with them. Will be charging them by solar.
Cheers Brian
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Reply By: Kiwi Ray - Sunday, Jun 26, 2005 at 14:37

Sunday, Jun 26, 2005 at 14:37
Hi Brian
You should not have any problems.
You will have twice the power available but it will take twice the time to recharge unless you increase the input rate.
AnswerID: 117532

Reply By: neilvin - Sunday, Jun 26, 2005 at 16:48

Sunday, Jun 26, 2005 at 16:48
Should be ok.
We have 3 x 115ah Deep Cycle batteries in our c/van, charged by either solar (via 3x 64 w pannels and a Plasmatronics PL20 Charge Regulator) or towing vehicle (via an Arrid Twin Charge) or a 3 stage battery chager when mains avail.
This ran a 2 x 12 v fridges, tv, inverter,lights etc for our 2yr trip around Oz.
AnswerID: 117541

Reply By: Alloy c/t - Sunday, Jun 26, 2005 at 17:09

Sunday, Jun 26, 2005 at 17:09
Have 3x80amp fullriver AGM on c/trailer linked in para to give 240 amp hr ,charging thru vehicle aux also 80amp fullriver AGM as is start batt ,controlled thru A w/ender ROTRONICS regulator [cheap if self fitted] ,,all batts fully charge while driving for even a short time ,1-2 hrs from discharge ,, when camped use solar 1x64 unisolar +1x120 kyocera thru a plasmatronics 20amp regulator , pumps out 10amp per hr on an AVERAGE type of winters day in sth/east Qld ,this runs an 80lt waeco fridge/freezer + an 15lt engle fridge and tops up the c/t batts for night time , my batts never drop below 12.5 volt,, some will dispute ,however system works for me in my situation.
AnswerID: 117543

Reply By: Topcat (WA) - Sunday, Jun 26, 2005 at 17:10

Sunday, Jun 26, 2005 at 17:10
Hi Brian, as previously stated you shouldn't have any problems. For best results use two identical batteries of the same capacity so that equalising beween the two will be even when discharging and charging. I have been running two heavy duty start batteries in parallel for years & haven't had any problems. Cheers.
AnswerID: 117544

Follow Up By: Member - Collyn R (WA) - Tuesday, Jul 05, 2005 at 12:57

Tuesday, Jul 05, 2005 at 12:57
No problems paralleling up to three or so batteries.

It is general belief that they need to be identical in capacity - but that's only important if they are in series as then the larger capacity will only partially charge because the smaller has reached max voltage sooner.

If in parallel each battery will draw whatever it requires from the charging source and each will arrive at full charge in much the same time.
Collyn Rivers
FollowupID: 374092

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