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Discuss 12V battery getting over charged..... in the Solar Thermal Forum area at

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  1. happyhippydad

    happyhippydad Member Electrician's Arms

    Hello solar forum, I don't often post in here!

    My shed has had solar power for the last 2 years.

    It has a 120W solar panel, PWM charge controller (see pic below) and a 105aH non-sealed deep cycle battery. I have not been looking after the battery properly and let the levels get too low for too long. I now have a new battery.

    The charge controller allows the battery to be charged to 13.7V (well that's what it says, my volt meter says 13.4V) and then keeps it at that voltage (at least during the day, drops lower at night). Is this voltage too high for my battery to be kept at and would this cause my battery levels to drop more quickly?

    charge controller.jpg

    Ps.. dont suppose anyone recognises this charge controller and can tell me what the 3 buttons do? I bought the kit from Bimble solar, nice chaps and helpful so they may reply but thought I'd ask here as well.
  2. oracle

    oracle Regular EF Member

    That's the same voltage that your motor car charges up to, so that's not the problem. Being unsealed you do need to keep an eye on the electrolyte levels in your battery.
    • Like Like x 1
  3. happyhippydad

    happyhippydad Member Electrician's Arms

    Thanks oracle, I've just been told the same thing by a friend. looks like it's more to do with the fact that I haven't been checking the levels often enough (at all!).
  4. telectrix

    telectrix Scouser and Proud of It Trusted Advisor

    Top Poster Of Month

    Business Name:
    should alway check your levels....look after your broom.
    • Like Like x 1
  5. gnuuser

    gnuuser retired Industrial wire monkey DIY

    nw.Pa. USA
    battery chargers whether vehicle or solar, charge at 13 to 15 volts as it must overcome the output of the battery to build up and store a charge.
    If the charger is exceeding 16 to 18 volts however then it regulator circuitry is or has failed.
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