Lil info regarding UPS automation

Discussion in 'General Electronics Chat' started by assuc, Jan 3, 2014.

  1. assuc

    Thread Starter Member

    Mar 23, 2012
    77
    1
    Greetings,
    I was thinking that in UPS(inverter) the automatic connection/disconnection of the battery charging works via relay(electromechanical) or Mosfet based in today's modern type system,
    what actually gets connected(shorted) the positive(+) or the ground(-); in ac mains let say the neutral or the live(phase)?
    Above query solved...
     
    Last edited: Jan 7, 2014
  2. #12

    Expert

    Nov 30, 2010
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    1) nobody could guess without a model number.
    2) you don't have to disconnect a battery charger to stop it from float charging the battery 24/7.
    3) therefore, it probably doesn't get disconnected.
     
  3. assuc

    Thread Starter Member

    Mar 23, 2012
    77
    1
    its not about model number its about the working i want to know
     
  4. #12

    Expert

    Nov 30, 2010
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    Do you think every manufacturer does it the same way?
     
  5. assuc

    Thread Starter Member

    Mar 23, 2012
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    I don't know how manufacture do it I m just asking what is the best suitable way
     
  6. #12

    Expert

    Nov 30, 2010
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    But your first post asks, "What is the actual way?"
    Depends on the manufacturer.
    In my opinion, the best suitable way is: the float charger probably never gets disconnected.
    I run my lawn mower battery that way. I have kept a truck in storage for a year with that method, and it works. The batteries don't sulphate and they are always ready for work, which is exactly the definition of what a UPS needs.
     
  7. assuc

    Thread Starter Member

    Mar 23, 2012
    77
    1
    Alright, that means battery never gets disconnected and that is done because to maintain battery life?
    if for example u want to charge the battery for a typical level of 13.5V such that when it attains that level it disconnects .... so what should be cutoff(positive or negative) of the charger in UPS to disconnect the circuit when battery not in use?
     
  8. Alec_t

    AAC Fanatic!

    Sep 17, 2013
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    Either method would work.
     
  9. assuc

    Thread Starter Member

    Mar 23, 2012
    77
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    As to why majority prefer it to be positive?? Does that anything to do with the efficiency or something else?
     
  10. #12

    Expert

    Nov 30, 2010
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    It's easier to do the math in your head when you use positive numbers.
     
  11. BillB3857

    Senior Member

    Feb 28, 2009
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    If you disconnect the battery from an Uninterruptible Power Supply, wouldn't that defeat the Uninterruptible part?
     
  12. assuc

    Thread Starter Member

    Mar 23, 2012
    77
    1
    Ahan, thanks now I got it....
     
  13. Anaandrew01

    New Member

    Mar 24, 2014
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    No, not at all. Because battery is the most important thing in the UPS
     
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