Hi, I have two similar model, one slightly newer than the other Smart-UPS 750's, with NMC2 cards.
This morning we had a short power failure, and one UPS lasted less than 6 minutes, the other the entire outage.
Weird thing is the UPS that ran out of power has much less load..
This is from the two UPS's:
Battery Temperature33.7°CRuntime Remaining5minUPS InputInput Voltage114.4 VAC @ 60.0 HzUPS OutputOutput Voltage114.4 VAC @ 60.0 HzLoad Current0.7 AmpsOutput VA9.7 %Output Watts7.8 %Output Efficiency79.0 %Output Energy Usage2081.38 kWhBattery StatusState of Charge100.0 %Battery Voltage27.0 VDCNext Battery Replacement Date06/24/2021
Battery Temperature32.8°CRuntime Remaining28minUPS InputInput Voltage113.0 VAC @ 60.0 HzUPS OutputOutput Voltage113.0 VAC @ 60.0 HzLoad Current1.8 AmpsOutput VA27.9 %Output Watts37.0 %Output Efficiency95.0 %Output Energy Usage3629.90 kWhBattery StatusState of Charge100.0 %Battery Voltage27.1 VDCNext Battery Replacement Date04/04/2043
Notice the 28mins vs 5mins runtime, and yes I see the efficiency is 95% vs. 79%, but the load is 1.7A vs. only 0.7A.
How is it possible that the 1.7A draw will last 5 times longer than the 0.7A draw?
The UPS's are scheduled to self-test every two weeks, no errors reported.
I ran a manual self-test on the bad UPS, and the test passed, but the battery failed.
How is it possible for the test to pass but clearly the battery failed?
10/11/2016 18:07:06 Device UPS: A low battery condition no longer exists. 10/11/2016 18:07:06 Device UPS: The battery power is too low to support the load; if power fails, the UPS will be shut down immediately. 10/11/2016 18:07:05 Device UPS: Self-Test passed. 10/11/2016 18:06:59 Device UPS: A discharged battery condition no longer exists. 10/11/2016 18:06:59 Device UPS: The battery power is too low to continue to support the load; the UPS will shut down if input power does not return to normal soon. 10/11/2016 18:06:58 Device UPS: Self-Test started by management device. 10/11/2016 18:06:56 Device UPS: The battery power is too low to support the load; if power fails, the UPS will be shut down immediately.
I replaced the battery, and runtime is back to normal.
Seems to me that the battery test is not doing its job.
APC, how about it, logs clearly shows dead battery during test, but battery test passes?
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