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UPS constantly charging

Discussion in 'Electronic Repair' started by dsn3775, Jun 17, 2007.

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  1. dsn3775

    dsn3775 Guest

    hi,
    my UPS-1400W sine wave inverter is not showing fully charged for past
    week despite continuous charging.
    it has LED indicators for showing
    1.low battery
    2.inverter on(power mains off)
    3. battery charging(mains on)(blinks when charging and stays lighted
    when fully charged)
    4.inverter off
    5.fuse blown
    6.main on(ac input supply on)
    for the past one week despite no power cut the UPS is indicating
    "battery charging".
    pls tell me what the problem could be.?
    thanks,
    deepak3775
     
  2. James Sweet

    James Sweet Guest


    Bad battery? How old is it?
     
  3. w9gb

    w9gb Guest

    After about 3 years -- most lead-acid batteries in these units begin to
    fail.

    APC UPS -- Failures points (in order to frequency)

    1. Batteries
    2. Charger circuitry
    3. Inverter circuitry

    gb
     
  4. JANA

    JANA Guest

    It's time to change the batteries. We have a number of UPS's at our
    location. The battery life averages about 3 years.

    --

    JANA
    _____


    hi,
    my UPS-1400W sine wave inverter is not showing fully charged for past
    week despite continuous charging.
    it has LED indicators for showing
    1.low battery
    2.inverter on(power mains off)
    3. battery charging(mains on)(blinks when charging and stays lighted
    when fully charged)
    4.inverter off
    5.fuse blown
    6.main on(ac input supply on)
    for the past one week despite no power cut the UPS is indicating
    "battery charging".
    pls tell me what the problem could be.?
    thanks,
    deepak3775
     
  5. dsn3775

    dsn3775 Guest

    there are 2 batteries.they r 1yr old.they hav become very hot .the
    water level in batteries is ok
    but the r giving 5hrs(normal) backup
    deepak
     
  6. JANA

    JANA Guest

    Your description does not constitute that the batteries are good. If they
    have become very hot, then they are most likely damaged. You will have to
    try new batteries to test.

    --

    JANA
    _____


    there are 2 batteries.they r 1yr old.they hav become very hot .the
    water level in batteries is ok
    but the r giving 5hrs(normal) backup
    deepak
     
  7. Steve Wolfe

    Steve Wolfe Guest

    Your description does not constitute that the batteries are good. If they
    If they're that hot, I would think that the charging circuit is
    overcharging them. Before spending the money on new batteries, I'd measure
    the voltage presented by the charging circuit while the batteries are
    connected, then disconnect the batteries and measure them each individually.

    If the charger was giving them more than a float voltage (27.8, within
    about .1), but both batteries were at (or above) 13.9 individually, then the
    charging circuit has either lost regulation on the float-charging stage, or
    is failing to switch from a bulk to a float stage.

    On the other hand, if one (or both) of the batteries measure significantly
    below 13.9, you have one or more shorted cells. If the charger was still
    presenting the 27.8-ish volts to them, then it hasn't recognized the shorted
    cells. The charger *might* be bad, or it may have just been battery
    failure.

    Those voltages are for dual 12V batteries in series. Half them if your
    unit uses 6V batteries.

    As for a 3-year rule on SLAs, if they're properly cared for, that's the
    *minimum* you should get. We replace our batteries at 3 years just as a
    precaution, but I have yet to see one fail before that time - *if* it's been
    properly cared for. Occasionally, someone will unplug their UPS, ignore the
    beeping until the battery is completely dead, and let the UPS sit like that
    for a month or two. That's not the battery's fault, it's the user's fault.
    The batteries that have failed on us have all been in units that were 4+
    years old, often 5-6 years.

    steve
     
  8. dsn3775

    dsn3775 Guest

    thanks for clarification,
    deepak.
     
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