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BACK-UPS XS 900 wont charge fully

APC UPS for Home and Office Forum

Schneider Electric support forum for our APC offers including Home Office UPS, Surge Protectors, UTS, software and services and associated products designed to share knowledge, installation, and configuration.

Solved
trauh42_apc
Cadet
0 Likes
1
102

BACK-UPS XS 900 wont charge fully

This was originally posted on APC forums on 9/29/2011


I recently replaced the batteries in my BACK-UPS XS 900 and it wont charge them beyond 91%. I've tried two different sets of batteries and it has once or twice gone over 91% but it always seems to settle back down to displaying that level of charge in PowerChute.

Powerchute shows "Remainging battery charge: 91%" and shows "Battery is currently: Charging"

Any idea how I can recalibrate the charge level. I tried running down the UPS on battery to around 7% and then recharging.

Windws 7 Professional
Powerchute 3.0.0.1

Thanks, Tom


Accepted Solutions
BillP
Administrator Administrator
Administrator
0 Likes
0
102

Re: BACK-UPS XS 900 wont charge fully

This reply was originally posted by Jonathan on APC forums on 9/29/2011


Hi Tom,

In performing manual runtime calibration, please follow these steps:

1. The UPS must have at least a 30% load on it during the calibration.
2. The load cannot fluctuate more than +/- 5% during the calibration.
3. Unplug the UPS from the input source and let it run on battery until it gets discharged.
4. Charge up the UPS/battery back to 100%

In addition to the abovce conditions, any UPS monitoring/shutdown software should be stopped from running in the background, and the serial cable should be detached from the UPS. This is necessary in order to prevent the software from shutting down the server/UPS due to an on-battery or low-battery condition

See Answer In Context

1 Reply 1
BillP
Administrator Administrator
Administrator
0 Likes
0
103

Re: BACK-UPS XS 900 wont charge fully

This reply was originally posted by Jonathan on APC forums on 9/29/2011


Hi Tom,

In performing manual runtime calibration, please follow these steps:

1. The UPS must have at least a 30% load on it during the calibration.
2. The load cannot fluctuate more than +/- 5% during the calibration.
3. Unplug the UPS from the input source and let it run on battery until it gets discharged.
4. Charge up the UPS/battery back to 100%

In addition to the abovce conditions, any UPS monitoring/shutdown software should be stopped from running in the background, and the serial cable should be detached from the UPS. This is necessary in order to prevent the software from shutting down the server/UPS due to an on-battery or low-battery condition