Batteries in parallel not equalising

Discussion in 'General Electronics Chat' started by TheSpud, Aug 30, 2011.

  1. TheSpud

    Thread Starter New Member

    Aug 30, 2011
    2
    0
    Hey all
    I have just connected 2x 12v car batteries in parallel. When I use this parallel set up to power a device only one battery will go flat. As if there is a problem with the circuit between the 2 batteries.
    I have tested all the wiring to the circuit and it seems fine. I have voltage from battery 1 all the way to the terminals of battery 2 and vice versa.

    There is also 2 low voltage cut outs on the circuit for when the batteries are connected individually. I have disconnected both of these to simplify the circuit and the batteries still do not appear to equalise with slightly different voltages (Battery 1 = 13v, Battery 2 =12.8v).

    To be honest I have not checked whether or not amperage is doubling yet. I am assuming that this would not be the case as 1 battery is flattening while the other stays charged and that the voltage is not equal on the all points of the circuit.

    Any idea's? I can't think of anything :mad:
     
  2. TheSpud

    Thread Starter New Member

    Aug 30, 2011
    2
    0
    Ok. I've tried a few different things and I've found the problem is the gauge of the wiring.

    If I substitute the smaller gauge wiring with jumper cables the circuit works perfectly.

    I will rewire the circuit with similar gauge to that of the jumper cables and it should do the trick.
     
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