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I have a digital inverter and its not charging the battery now...

I use a digital inverter at home ...............but m havin a problem that its not charging now...............what should i do

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Hi! depending on how long you had the UPS the batteries only have a limited life. So lets say you had this UPS for a wile and the batteries are discharged often, the batteries can fail to hold a charge after about three years. If it is likely a year old I would check into the warranty. But three to four years may need replaced and can usually be done by an end user. PS: the inverter may appear not to work at all or just shut down with a bad battery as a safety mechanism. If a new battery or set of batteries does not remedy the problem, then there is a problem with the electronics. If I know the symptom of witch I can help with that as well.

Posted on Nov 21, 2008

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Posted on Jan 02, 2017

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Hello, I recently picked a MGE Evolution 850 UPS from an abandoned facility, I brought it home, and I left it charging for about 4 hours. However, when I pressed the power button, nothing happened, no


Firstly, isolate the troubled area by inputting battery equivalent healthy voltage from any suitable DC source. If inverter works, then the problem is in battery, if it doesn't, check the transformer and output transistors of the inverter.

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UPS - Battery Fault


UNINTERRUPTABLE POWER SUPPLY
Batteries in the UPS typically last 3 to 5 years and it depends upon several factors. Including the number of times the unit must go on battery power and environmental conditions. There are usually several batteries in the UPS and while the battery voltage may show 13 volts, this may only be a float charge/voltage and a true indication of the battery voltage and condition requires the batteries to be tested under a load. If one battery is faulty in a set of batteries it will causes the whole battery system to fail and indicate a battery fault. A faulty charging circuit will not charge the batteries and will also cause a fault condition.

Lower powered and cheaper type UPS are switch over types, when the mains supply fails, the UPS switches over to the battery and inverter in milli-seconds which then supplies mains power to the computer and peripherals. A faulty inverter circuit and or flat batteries won’t deliver standby power when the mains supply fails.

NOTE the power waveform from these UPS is a pseudo sine wave (i.e. not a true sine wave).

The true UPS types are usually the higher KVA units (over 1500 VA) that supply continuous mains power. The mains power is connected to a charger which charges the batteries and the inverter draws power from these batteries and converts it to true sine wave mains power to the computer equipment, therefore there is no switch over time lag when the mains supply fails.

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APC 800va inverter is not charging


Yadava,

If you need pricing on a new or replacement unit I can help. You may also want to look into APC's Trade-Ups program where they give you a discount on new equipment as long as you provide a serial number for your existing: http://buy.apc.com/commerce/storefronts/tradeups/

If you need UPS, Surge, or Power Related help contact:
Inside Service Sales
Daniel Salazar 800.260.2259 daniel@psihq.com
Power & Systems Innovations, Inc.
customerservice@psihq.com

Power & Systems Innovations, Inc. is an Elite Certified Service
Sales Partner for APC/MGE brands manufactured by Schneider Electric

Visit us at www.psihq.com

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Probably batteries have developed high internal resistance.

Replace with new batteries.

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there are 2 parts of a UPS .
the charge side
and (battery is obvious)
the inverter side.
if the charger fails, all is lost. (are the batteries in backwards?)
if the charger works (volt meter tells you that)
then the inverter is bad. (this unit is not full time UPS , but part time, this means it switches over to inverter at power fail.
(on full time sys. inverter runs full time, like the name states)
the unit, you mean the load right.?
the UPS side plugged into a load. and the load is now dead.

the Backup plugs should work if the mains are hot.
if you kill mains, the inverter will fire off, (hear the squeal?)
and give you 500 watts for some minutes, sucking the batteries dry. (see load run time curves)
I used to do service on HUGE UPS systems, some with 100s of batteries. 3 to 5kw too.
on ours there is a port on the rear , we connect and can
check everything "BEST brand" even charge voltage.
did you look on APC site for special software and connections?

the manual does cover trouble shooting, ever read that?
RTM? start there, its online, for sure.

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This a possible failure of the voltage detection circuit in the inverter main board and requires the fault be identified by checking the voltage/current feed/limiter to the battery.
Once when the battery voltage has reached the threshold set up the charging should stop and then the circuit will analyse the voltage on the board to trigger the charging to be put ON.
This can be a failure of the detection circuit and if not checked can damage the battery.

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Dear, Please check following

1. Are you using correct gauge of wire for batteries (Specification mentioned in the manual)
2. You need to charge your batteries at least for 8 hours (as recommended by Mercury)
3. Please place your Inverter in a cool environment (20 to 30 C)
4. Nominal voltage of battery should be 12Volt if using 1x Battery.

Regards.

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keep on your main switch. off all the lights fan and other electrical items, let that inverter get charge first

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