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  • Running Batteries in Parallel

    I'm considering running two auxillary 105ah batteries in parallel to double the capacity for my fridge.

    I've read many reports on how bad this is for batteries and was wondering if any others have had success / failure.

    I have the RanOx unit as a charger as well as a Ctek for when we're near power.

    Thoughts?
    2009 GXL D4D White Auto - ARB Duluxe Bar - Lightforce 240 Blitz spots - Icom IC440 CB - Bilstein shocks, Lovells 1.5" lift H/Duty coils - Polyairs - Tracklander Alloy roof cage and ladder - Maxtrax - rear work lights - PP Rear-door-table - Underfloor water tank - 275/65/17 BFG AT's - Ranox dual battery system - Rear door spacer - Safari snorkel - Steel sliders - ARB front and rear air lockers - ARB CKMTA12 onboard air compressor...

  • #2
    Why would this be bad for the batteries? You have already stated that both are of the same type and rating? So it would be more a question of whether the RanOx is adequate for charging two batteries as the same time and, of course, correct cable size selection for the connection between the two batteries...

    How far apart are the batteries located? What cable size are you using? Which RanOx unit do you have?

    I find a quick email to the manufacturer of the charging unit usually works, I have had many conversations with redarc regarding variations of setups and install methods, all with good results!

    EDIT: Rethinking this - UPS (Uninterruptable Power Supplies) use large banks of lead acid batteries (or other types) and with the correctly setup charging unit they work quite well in parallel...
    Matty80
    Avid PP Poster!
    Last edited by Matty80; 23-05-2011, 11:59 PM.
    2014 D4D 150 GXL Automatic - CHARCOAL

    Comment


    • #3
      I run 2 aux batteries in parallel, one being an 80AH and another 105AH. the size difference is because of the weight issue with the piranha batt tray behind the drivers side light. I have an ARB tray that sits up the back of the passenger side, and they are linked together by 8mm wire. I just have a piranha DBE 140S isolator between the 2 batteries and the main battery. All seems to be working fine so far. I don't have any battery chargers or anything, just relying on the alternator.

      I have ran my fridge for 2 weeks with only minimal driving (maybe 60 minutes of driving a week) and the batteries only dropped to 11.8V.

      Comment


      • #4
        hi bankrupt . im testing my setup as we speak on the bench in the garage . im running 2 x120ah agm batteries in parrallel in the back of the car linked to just a redarc smart soleniod connected via an anderson plug . this was all wired up by my local auto elec . this was set up to run 2 waeco's for a minimum of 2 days without having to fire up the car . at the moment its been running my 40ltr for 3 days , ill let you know how long it runs for . there shouldn't be an issue with them in parallel .
        03 grande v6 , with added stuff that makes it go places . RTFM people !
        founding member of the " you don't need all that crap on a prado association "
        "you only use 15% of your brain " Einstein . " so why not burn off the other 85% " Cheech & Chong .
        petrol , petrol ,petrol , you know it makes sense ! im kavpetrolbitch

        Comment


        • #5
          I have no issues with charging or cabling as the single battery works fine. It's just that a Telstra report I read into their outback solar battery failures (which are effectively AGM's in parallel) said that in almost all instances of failure it was due to excessive phosphate build up which was common in a parallel environment.

          Was just curious, I still think the +'ve's will outweigh the -ve's.
          2009 GXL D4D White Auto - ARB Duluxe Bar - Lightforce 240 Blitz spots - Icom IC440 CB - Bilstein shocks, Lovells 1.5" lift H/Duty coils - Polyairs - Tracklander Alloy roof cage and ladder - Maxtrax - rear work lights - PP Rear-door-table - Underfloor water tank - 275/65/17 BFG AT's - Ranox dual battery system - Rear door spacer - Safari snorkel - Steel sliders - ARB front and rear air lockers - ARB CKMTA12 onboard air compressor...

          Comment


          • #6
            run them in series then.... haha.

            don't actually, possibly wouldn't be too much fun.
            2011 150series GXL

            Comment


            • #7
              Just beware about running two batteries in parallel that have a large difference in age and/or condition.

              Once (you only do this once) I bought a new battery for my camper and put it in parallel with the old battery expecting an increase in capacity. When I didn't get the expected increase I took the system to my local 12V shop and he informed me that running an old battery had actually sucked the life out of the new battery!! After much embarrassment at my basic mistake I bought two new batteries, wired them in parallel and the setup has run perfectly since.
              [I][B]Jeff[/B][/I]
              2008 Silver D4D GXL, 6 spd man, OME Suspension, Sovereign Bullbar, Safari Snorkel, ScanGauge II, Dual Batteries, Rhino Roofracks, xSports Spotlights, Uniden UHF, ARB Draw System and Cargo Barrier, long wish list, minister for finance with no sense of humour........

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              • #8
                Never connect new with old and alway replace both batteries when one dies in a parallel system. Good practice and not always done due to costs...
                2014 D4D 150 GXL Automatic - CHARCOAL

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                • #9
                  Hi Bankrupt.
                  I ran a 50l waeco as a freezer (-15 degrees) and a 60l engel as a fridge (4) from two 120ah batteries on the camper trailer and a 50ah auxiliary in the car in parallel for 7 months. I had no problems with either the batteries or refrigeration, irrespective of the charging source (240v, solar, alternator). Some of the newer chargers have a cycle to handle sulphation in the batteries that have been left flat for extended periods. I don't know how this relates to phosphate build up or the Ranox charging system.
                  Dune coloured 08 D4D GXL, ARB deluxe bullbar, magnum winch, IPF XS lightset, ARB rear airlocker, ARB air compressor, Lovell springs, Bilstein shocks, Coopers 265/65/R17, Outback roller drawers, Jaram roof rack, Anderson plug, gme TX3440, Polaris 3119, TPMS.

                  Comment


                  • #10
                    First off, Jeff, I don’t know how your 12v guru “KNEW” the “OLD” battery had sucked the life out of the new battery just because it was an “OLD” battery.

                    You can have two identical batteries wire in parallel and get the same results.

                    Say, if one battery drops a cell, it will pull the other battery down to a flat state and if this is not detected soon enough, you will most likely damage the good battery, and this will occur whether the batteries are two totally different batteries or two identical batteries.

                    There’s lots of myths and misunderstanding about paralleling 12v lead acid batteries and I am sure some of this misinformation come from people mixing up info relating the batteries wired in series ( where all batteries must be as close to identical as possible ) with wiring batteries in parallel.

                    You can wire any 12v lead acid battery in parallel with any other 12v lead acid battery, no matter what type, size or age each battery is.

                    To make this statement crystal clear, in normal RV use, you could permanently wire an old 100 Ah flooded wet cell battery with a brand new 55 Ah spiral wound AGM and there will be no problems caused by doing this that would not occur if you wired to identical batteries together.

                    If anybody doubts my statement, do a google and see if you can find a single DOCUMENTED event that states damage has been done to one 12v lead acid battery because it was parallel wired with a different type of 12v lead acid battery, when these battery are used in automotive situations.

                    The only time in RV use where you should aim for fairly similar batteries is when these batteries are going to be used for ultra high current operations, like winching.

                    Bankrupt, just wire your two batteries in parallel and leave them that way.

                    One point, your DC-DC device will now take MUCH longer to charge your two batteries than just charging them straight off your alternator.
                    drivesafe
                    Senior Member
                    Last edited by drivesafe; 26-05-2011, 07:20 AM.

                    Comment


                    • #11
                      Originally posted by drivesafe View Post
                      First off, Jeff, I don’t know how your 12v guru “KNEW” the “OLD” battery had sucked the life out of the new battery just because it was an “OLD” battery.

                      .
                      First off I admit I am no expert in this area so need to rely on people with more knowledge. I had an old battery purchased with my camper which seemed to discharge rapidly from a fully charged state with only a few items drawing current. I purchased a new battery in an attempt to increase the overall capacity of the system. However, within 6 months I noticed the system was again discharging faster than expected. I took the whole system to my local 12V shop where they load tested the system and both batteries independently over a period of time and provided me with the diagnosis above – that is, the older battery was causing the system to discharge at a greater rate and had damaged the newer battery. Since replacing with two new batteries the system has work perfectly.
                      [I][B]Jeff[/B][/I]
                      2008 Silver D4D GXL, 6 spd man, OME Suspension, Sovereign Bullbar, Safari Snorkel, ScanGauge II, Dual Batteries, Rhino Roofracks, xSports Spotlights, Uniden UHF, ARB Draw System and Cargo Barrier, long wish list, minister for finance with no sense of humour........

                      Comment


                      • #12
                        Hi Fellas. Regarding phosphating of lead acid batteries. In a solar system with a light loading and slow trickle recharge situation, Phosphating of auto batteries is to be expected. In an automobile where the alternator is really poking it in to bring the batteries up to charge this is unlikely to be the case. Occasional heavy cycling of auto batteries is good for them. Cheers.
                        2005 100 Series Landcruiser. 4.2 T/D 5 speed auto. LTD c/w AHC/Leather etc.

                        Comment


                        • #13
                          Hi again Jeff, and I think you missed my point, the problem was not that you had put an “OLD” battery with a new one, the problem was that you put a “FAULTY” battery with a good battery.

                          The age of the old battery may or may not have been a contributing factor to the OLD battery being faulty, but it was the fact that the old battery was faulty that was the ultimate down fall of the other battery.

                          Comment


                          • #14
                            Originally posted by drivesafe View Post
                            Hi again Jeff, and I think you missed my point, the problem was not that you had put an “OLD” battery with a new one, the problem was that you put a “FAULTY” battery with a good battery.

                            The age of the old battery may or may not have been a contributing factor to the OLD battery being faulty, but it was the fact that the old battery was faulty that was the ultimate down fall of the other battery.
                            Okay - Thanks drivesafe, I understand what you are saying and is probably a more accurate interpretation of the situation. It certainly has made me more aware of my 12v system and what it is and is not doing!!
                            Cheers
                            [I][B]Jeff[/B][/I]
                            2008 Silver D4D GXL, 6 spd man, OME Suspension, Sovereign Bullbar, Safari Snorkel, ScanGauge II, Dual Batteries, Rhino Roofracks, xSports Spotlights, Uniden UHF, ARB Draw System and Cargo Barrier, long wish list, minister for finance with no sense of humour........

                            Comment


                            • #15
                              Hi Bankrupt.
                              I think it would be as safe as running a deep cycle and a cranking battery together.. and that gets done by everyone with a dual battery set up every day..
                              It charges from the alternator no problems.. and being 2 batteries, will take twice as long as charging one, and twice as long as draining one... all your doing is making a bigger battery really.

                              Jeff.
                              Reminds me of my safari in Africa. Somebody forgot the corkscrew and for several days we had to live on nothing but food and water.
                              W. C. Fields (1880 - 1946)

                              Comment

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