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Posted: 2025-07-07 02:39 AM . Last Modified: 2025-07-07 02:40 AM
UPS sometimes give the warning :
Critical - UPS: The battery is not installed properly.
followed after few minutes by :
Informational - UPS: The battery is now installed.
Once mains was removed, UPS died immediately !
It has 4 x 8 batteries packs.
Each pack measures 110 to 113 Vdc unloaded (even if an unloaded measure means nothing).
Batteries or UPS fault ?
Any comment/suggestion ?
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Posted: 2025-07-07 06:41 AM
Based only on the information you provided here it appears the RBC is dead. What is the production date of the RBC vs the battery installation date?!?
The average service life of the Replacement Battery Cartridge (RBC) is 2-5 years. Based on usage, temperature, and environmental factors.
Provide the following logs for better insight: Event, Data, UPS, and a photo of the RBC’s production date sticker / embossed stamp.
Questions Ask . . . 👍
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Posted: 2025-07-07 07:41 AM
If you mean the APCRBC140 units, the batteries inside each of them have been replaced more than one time, at interval of 3-4 years.
The last replacement was in 2022.
There are four RBC in this unit, how do they work ? two by two in parallel or four in parallel ?
Can I test the unit with a single or at least a couple of them to evaluate a new total replacement of batteries ?
The thing I'm concerning about, is the way UPS died when I disconnected mains, just as if there were no batteries attached, and no previous indication of low battery level or faulty battery.
Thanks
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Posted: 2025-07-08 10:32 AM . Last Modified: 2025-07-08 10:35 AM
The system is configured to 192 VDC which is two RBC in series. As such each pair must be replaced together (NOT) separately.
The system is hot swappable as such you can easy check if the UPS is fine or not. While on AC Mains remove the primary RBC sets.
The only thing that should happen when you disconnect the two primary RBC is an active fault with alarm.
If there are external battery packs disconnect them first before you remove the primary RBC pairs from the main unit.
Obviously ensure this is done in a maintenance window so the servers / switches can be gracefully taken down if a hard shut down is seen.
You have not provided any of the information that was asked! ☝️
Questions Ask . . 👍
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