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lead acid batteries in parallell?

Discussion in 'Electrical Engineering' started by Frank White, Apr 7, 2006.

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  1. Frank White

    Frank White Guest

    I have seen this a few times now and have always felt that it is a bad
    idea because if one cell in one of the batteries is worn out more than
    the others then you will always be discharging one battery with the
    other.

    The first time I saw this was on tractor starting batteries, and
    recently on a scissorlift.
    How common are parallell battery arrangements and is this something
    worth worrying about?


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  2. Rich256

    Rich256 Guest


    Unless one has a shorted cell there should be no problem in parallel.
    My Diesel Truck has parallel batteries.


    It appears to me that if they are not the same size the one with the
    larger capacity will supply most of the current. Since the voltage will
    always be equal they should discharge to the same state of charge even
    though they are different size.

    When being charged they will charge according to their size, the voltage
    determining their state of charge.
     
  3. Spokesman

    Spokesman Guest


    Most emergency light systems that supply more than two or three remote
    units use multiple series/parrallel batteries. If they are allowed in
    this
    application they must be quite reliable.
     
  4. daestrom

    daestrom Guest

    BULL!!! Want to tell me were on a submarine you think the lead acid
    batteries are in parallel?? Battle-lanterns (6V primary cells that are
    never recharged) ??

    Nuc boats only have one ships battery and it's over a hundred cells in
    series. Diesel boats (of which the US Navy has zero) had two ships
    batteries. Yes, those could be connected in parallel, but only during
    discharge, they charge separately (various connections could be set up from
    the manuevering room)

    Parallel operation can work well for small batteries like your typical
    marine engine starting application. But it isn't the best choice. One
    battery can go bad and 'hog' all the charging current. Many marine
    applications include a switch to allow switching from one battery, to the
    other, both, or neither (nice to be able to disconnect the batteries when
    working in the engine compartment)

    daestrom
    (former Chief Electrican's Mate, USNavy Submarine Service)
     
  5. Ross Mac

    Ross Mac Guest

    Should work fine as long as you use the proper isolation system. Here's one
    link of many that explains it in the event you don't already know of such
    devices..
    http://www.thejump.net/fishingarticles/Ship-Shape.htm
    Good luck....Ross
     
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