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How to wire 6x12v batteries in series parallel

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  • How to wire 6x12v batteries in series parallel

    I just need a diagram if possible on how to wire 6 12v batteries in series parallel to 24v system with minimal voltage drop.
    Thanks again. LATE.

  • #2
    i don't have a way to sketch it, but you will end up with 3 parallel strings which is tough to get equal loading of all batteries. 2 strings is much easier.

    If you have not yet bought batteries, consider using four 6v batteries in series for 24V Simplest is golf cart batteries, cheap. 3-5 year life, and you get 24v 200ah. If you need more, parallel a 2nd series string and you get 400ah. Need More ? go with larger batteries, floor scrubber is another, cheap common 6V 400ah battery, and you can get that in one series string

    here's the link to the parallel battery wiring issues
    Powerfab top of pole PV mount (2) | Listeroid 6/1 w/st5 gen head | XW6048 inverter/chgr | Iota 48V/15A charger | Morningstar 60A MPPT | 48V, 800A NiFe Battery (in series)| 15, Evergreen 205w "12V" PV array on pole | Midnight ePanel | Grundfos 10 SO5-9 with 3 wire Franklin Electric motor (1/2hp 240V 1ph ) on a timer for 3 hr noontime run - Runs off PV ||
    || Midnight Classic 200 | 10, Evergreen 200w in a 160VOC array ||
    || VEC1093 12V Charger | Maha C401 aa/aaa Charger | SureSine | Sunsaver MPPT 15A



    • #3
      Some of my lessons learned from my first wiring I did for batteries was keeping the cables short as possible I found that the 2/0 welding wire bent better then the THHN 2/0. One thing I wished I’d done is look at using 90 degree terminals instead of standard terminals. Some of the connections could have been 4 inches of 2/0 wire instead of the 12” of cable it took to go the same distance.

      For my configuration I used 5 feet of 2/0 wire for 2 series 2 Parallel four six volt batteries to 12 Volts total. It’s the 400 ah configuration with golf cart batteries talked about above. I think with those 90 degree terminals it would have cut the wire distance to a total of two or three feet.

      I found it amazing how much voltage loss there is in low voltage higher amperage DC.