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Lead Acid Battery in parallel

Discussion in 'Electronic Basics' started by Jack// ani, Dec 9, 2005.

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  1. Jack// ani

    Jack// ani Guest

    Hi all,

    Why do manufacturer specify number of battery that can be shunted
    together, so as to increase the AH rating?? Is there any hazard
    involved....if I go beyond this?

  2. Rich Grise

    Rich Grise Guest

    I've never seen such a spec. As long as the batteries are the same
    chemistry, same voltage/capacity rating, and maintained properly, you
    can put any number of them in parallel - go look at the battery banks
    at the phone company sometime. :)

    Of course, your wiring (or bus bars) have to be capable of handling
    the current.

  3. Pooh Bear

    Pooh Bear Guest

    Me neither. It sounds very odd.

    A study of submarine batteries should prove interesting in that regard.

  4. Sjouke Burry

    Sjouke Burry Guest

    You will get a very interresting expierience if one of
    the sets fails short ciruit!.With to many in parallel,
    a nice explosion should follow.
    If possible,shop for a larger single unit.
  5. I saw one of those overgrown stereos in a mini pickup truck go up in
    flames when one of the seven 12 V lead acid truck batteries failed and
    shorted out the others. There were no fuses, because "They take away
    points an the contests" so everything burnt. The two guys in the cab
    barely made it out because the rear of the cab was cut out. After that
    fire I sold a lot of surplus 90 Amp DC circuit breakers at the asset
    recovery company I was working for.
  6. Jack// ani

    Jack// ani Guest

    Well, I read should not place more than 3 batteries
    in parallel, also the AH rating of all those batteries should be
    equal!! Maybe its not true....just want to confirm!!

    Thanks again
  7. Rich Grise

    Rich Grise Guest

    Well, if you're handling 2.5 cm x 10 cm (1" x 4") solid copper bus bars,
    you'd have to be supremely clumsy to cause a short. ;-) Like Pooh said,
    check out some submarine batteries. Or, if that's inconvenient, go
    to your local railroad roundhouse and look at some locomotive batteries. ;-)

  8. Rich Grise

    Rich Grise Guest

    No, somebody's blowing smoke up your pants.

    from one, larger, battery.

    The bugaboo might be ensuring that your circut loads them equally, which,
    if you're drawing hundreds of amps, might take a little bit of thought as
    to the design, like big fat bus bars. :)

    And, oh, yeah, that idiot that left out the fuse because "it takes off
    points" sounds like the perfect audiophoool.

    Where do such stupid people get such huge piles of money to throw away
    on that crap?

    Good Luck!
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