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Will this charger work?

Discussion in 'Power Electronics' started by Aidan67676767, Dec 2, 2017.

  1. Aidan67676767

    Aidan67676767

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    Nov 17, 2017
  2. Bluejets

    Bluejets

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    Oct 5, 2014
    What are the 3 x 12v batteries?
     
  3. 73's de Edd

    73's de Edd

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    Aug 21, 2015
    SERIES charging can be " VEWY-VEWY " problematic, you need 3 identical batteries and all of them being at the same state of discharge, or the "BIG DOG" gobbles it up and the weaker one(s) starve.
     
  4. WHONOES

    WHONOES

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    May 20, 2017
    If your charger is only 36V, that will not be enough to charge 3 batts in series. You will need 42V. As 73's de Edd said one with lowest charge will dominate.
     
  5. Aidan67676767

    Aidan67676767

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    Nov 17, 2017
    Ah, thank you, they are SLA Batteries, they are all the same, any other thoughts?
     
  6. WHONOES

    WHONOES

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    May 20, 2017
    A I have said elsewhere, you need 2.35V per cell to charge lead acid batteries. If you re using sealed lead acid types, you should limit charge current to 25% of capacity. If you have 3 of varying capacities, set to the smallest one.
     
  7. Bluejets

    Bluejets

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    Oct 5, 2014
    Link shows 42v 2a.... Thats why I asked what are the 3 x 12 batteries. "doesnt appear to be working" could cover many possibilities.
     
  8. Terry01

    Terry01

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    Jul 5, 2017

    That's what I was thinking Neeb. Can you elaborate a bit on "doesn't appear to be working"??
     
  9. WHONOES

    WHONOES

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    May 20, 2017
    If you charger is not .............. charging, you could have a dead cell in one of your batteries, that would cause you problem. You could check is this is so by connecting a car headlight bulb across each battery in turn. The one that doesn't light up is the culprit. If you do have a dead cell, there is not much you can do other than replace the dead'un.
     
  10. AprilSteel

    AprilSteel

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    Feb 2, 2017
    Hey?? In my book charging a string of series batteries if the charger sends out 10 amps then 10 amps flows through every battery in the string does it not . In fact every cell in each battery along the way.
    Internal resistance adds together to determine the current . If 10 amps is flowing then it is flowing through all the resistance because the voltage is enough.

    Where does the big dog bit come in?
    I know its an old thread but needs some explanation Edd.
    Perhaps you mean parallel charging.
     
    Last edited: Oct 13, 2019
    thedoc298 likes this.
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