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Thread: Running two different AH batteries together?

  1. #11
    Travelling Podologist Cuppa's Avatar
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    Quote Originally Posted by alfonso View Post
    just a quick note . I was told when joining batteries to have positive on one battery and negative on the other for charging as this creates the vision of one large battery

    I expect you are referring to connecting two batteries together in parallel (i.e. keeping the same voltage of a single battery whilst increasing capacity). If so your informant was correct & it looks like this. You can connect loads to just one of the batteries, they will still charge & discharge as one, but the pictured method is considered better (although I’m not exactly sure why).



    If connecting more than two batteries together in parallel there are several ways to do this, the article here suggests which are the better options.
    In my Patrol the three aux batteries are connected in the star pattern (Method 3 in the above link) similar to this:

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    2006 4.2TDi ex-Telstra Remote area Camper. 425w roof mounted solar, 360Ah Aux batts, BCDC1240, Onboard hot & cold pressurised & filtered water, (25 litre hot water calorifier), ARB fridge, ARB freezer, Built in kitchen, heaps of easy access storage, 240v, 3” Genie exhaust + dynotune, 2” lift, 3900kg GVM upgrade, second glovebox, ROH Blaktrak steel wheels, Bridgestone D697's (now Toyo RT's), Redarc gauges/pillarpod, Hema HX-1, Icom 450 CB, dual rear view cameras, Onboard 30amp Victron mains charger, second glovebox, dual seat conversion, TPMS, Boss PX7 onboard air with 9 litre tank, 350w inverter, Steel bullbar, Harrop Eaton diff lock (front), Warn winch, Snorkel, Dual spares , 160 litre water tank, 180 litre fuel in two tanks (approx 1200km range) 2010 Tvan Tanami. (incl another 70 litre water tank) with matching wheels/tyres (& 3rd spare)
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  3. #12
    The master farter
    mudski's Avatar
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    I think cuppa, he means +ive on one battery to the -ive on the other battery. Which would turn it into a 24V battery.

  4. #13
    Travelling Podologist Cuppa's Avatar
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    Quote Originally Posted by mudski View Post
    I think cuppa, he means +ive on one battery to the -ive on the other battery. Which would turn it into a 24V battery.
    Yeah I thought alfonso’s post could have meant either, which is why I made my post to clarify. Not many Patrols had 24v systems, but a few did. When connected as you suggest (in series) the voltage increases but the capacity remains the same as that of a single battery. It would not be a good thing to connect a second battery like this in a 12v vehicle!

    2006 4.2TDi ex-Telstra Remote area Camper. 425w roof mounted solar, 360Ah Aux batts, BCDC1240, Onboard hot & cold pressurised & filtered water, (25 litre hot water calorifier), ARB fridge, ARB freezer, Built in kitchen, heaps of easy access storage, 240v, 3” Genie exhaust + dynotune, 2” lift, 3900kg GVM upgrade, second glovebox, ROH Blaktrak steel wheels, Bridgestone D697's (now Toyo RT's), Redarc gauges/pillarpod, Hema HX-1, Icom 450 CB, dual rear view cameras, Onboard 30amp Victron mains charger, second glovebox, dual seat conversion, TPMS, Boss PX7 onboard air with 9 litre tank, 350w inverter, Steel bullbar, Harrop Eaton diff lock (front), Warn winch, Snorkel, Dual spares , 160 litre water tank, 180 litre fuel in two tanks (approx 1200km range) 2010 Tvan Tanami. (incl another 70 litre water tank) with matching wheels/tyres (& 3rd spare)
    A Nomadic Life (Blog)

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