DIYbanter - UPS constantly charging

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UPS constantly charging

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

UPS constantly charging

"dsn3775" wrote in message
ups.com...
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

Bad battery? How old is it?

UPS constantly charging

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
_____

"dsn3775" wrote in message
ups.com...
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

UPS constantly charging

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

UPS constantly charging

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
_____

"dsn3775" wrote in message
oups.com...
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

UPS constantly charging

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.

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

UPS constantly charging

On Jun 19, 12:16 am, "Steve Wolfe" wrote:
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.

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

thanks for clarification,
deepak.