SYMMETRA PX 160KW backup time issue

[Anonymous user]

Dear Team,
We are facing Backup time issue with Symmetra PX 160K. 48 PLP battery module install in UPS and XR frame UPS showing backup time 7hr 1 minute on NMC. The detail is given below.

UPS load 7.8 % (please see attached ( run time screen shot)
Battery Capacity 100% charged.(please see attached ( run time screen shot)
No of battery Module 48 PLP ( Please see attached # of battery screen shot)
Showing Run time 7hr1 minute on NMC .(please see attached ( run time screen shot) but we test UPS backup time physically UPS provided backup time 3 hr 9 minute (please see attached backup time results screen shot.)
UPS
Model SY32K160H-PD (with two additional Power Modules SYPM10k16H)
Serial # PD1117160068
XR Frame Qty 1

Message was edited by: zakir

[BillP · Accepted solution]

hello, someone from our 3 phase support team was gracious enough to review your question. here is what I got back:

Unfortunately I am unable to view the screenshots.

There are two main things to consider when runtime is involved, the estimated time and actual time.

The estimate time is based on 4 things:
-The number of batteries
-The battery charge
-The Load on the UPS
-The battery calibration factor

Actual runtime is based on all those factors, plus the actual age and health of the batteries.
- since your batteries are coming up on two years old, you actual runtime will be less then the predicted runtime.


There are some reasons why the estimated rutime may be too high.
-The first is that your load is so low. There is certainly no issue with having a lightly loaded UPS, but runtime estimations increase exponentially as load approaches 0. So very small loads may have high reported runtimes.
-We also mentioned that batteries have less runtime as they age. If you have never done a run-time calibration on the UPS, you could run one, and see if the UPS adjusts its runtime estimation
-there is also one setting that should be checked. In your network interface, go to UPS-> Configuration -> General, and ensure that the "external battery cabinet" is set to 0 Amp-Hour

A sanity check you can perform. Run a UPS self test, note the values for battery voltage, runtime, and battery capacity before and after the test - also note how long the test runs for. Generally the runtime remaining after a self test would be much closer to your actual runtime.

For further details, you can always open a support ticket with the technical center for your region:
www.apc.com (select your country/region)-> Support -> contact us