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Maximum Battery Charging Amperage

  1. Dec 7, 2011 #1
    Hi all,

    I am trying to determine what is the maximum number of amps I can charge 4 batteries that are in parallel and series ( 4x12V batteries) to produce 24 volts.

    I have the specs on the batteries and everything but can not seem to determine how many amps they can handle when being charged? I even talked to the distributor and he kinda just told me "Yah, you should be fine", but couldn't provide me with any kind of calculations or limitations on the batteries.

    They are charged at 28 (+ or - 1) volts and sometimes spike at ~150 amps.

    Thanks for any help.
  2. jcsd
  3. Dec 7, 2011 #2


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    Gold Member

    I'm assuming you are considering lead-acid batteries (deep cycle perhaps)? Battery charging current is very dependent on their temperature. I'm surprised your specifications don't mention this. Anyway, I'm not endorsing this paper but from my experiences with maintaining a UPS battery bank consisting of 10 in series, this sounds correct:

    More here:

    Last edited by a moderator: Dec 8, 2011
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