Smart-UPS X750 sudden battery power too low.

[jwood_ok]

Hey all, I have a Smart-UPS X750 that, while a little up there in age, doesn't look like it's due for a battery replacement for about a year.

A couple of days ago, it suddenly said that the battery power was too low to support the load.  The load should not have changed.  Here's what is showing: in the logs at about that time - any ideas?

03/22/2025	09:17:08	Device	UPS: The battery power is too low to support the load; if power fails, the UPS will be shut down immediately.
03/22/2025	09:17:05	Device	UPS: RFC1628 MIB UPS is no longer on battery.
03/22/2025	09:17:05	Device	UPS: No longer on battery power.
03/22/2025	09:16:44	Device	UPS: RFC1628 MIB UPS is on battery.
03/22/2025	09:16:44	Device	UPS: On battery power in response to distorted input.
03/20/2025	19:53:19	System	NTP update successful.
03/19/2025	01:46:23	Device	UPS: RFC1628 MIB UPS is no longer on battery.
03/19/2025	01:46:23	Device	UPS: No longer on battery power.

[Teken]

Remove AC Mains from the wall outlet. Time how long the system run for before shutting down and report the same here.

When you reply upload the event, data, ups logs along with a screen capture of the UPS NMC About Tab.

Questions Ask . . . 👍

[jwood_ok]

Hey @Teken Thank you for the information.  I'm not currently on site, so I can't do this at this time.  I was kind of hoping there may be information that could be gathered remotely.  We may have someone going to the site next week at some point.

[Teken]

All of the relevant validation tests requires a person to be onsite. More specifically completing a static & dynamic load tests.

Removing AC Mains with the loads attached is a dynamic tests. It will accurately reflect the current state of the system and battery cartridge.

The service life of the battery cartridge is rated for 2-5 years. Which is based on usage, temperature, and environmental conditions.

When someone gets on site document what the battery cartridge indicates as the production date vs what is displayed on the NMC. 

Afterwards the validation can commence and time the operational runtime and compare it to the APC Runtime Calculator.

If the chart indicates a load say 200 watts is equivalent to 30 minutes but you see 6 - Replace. Obviously if you see only 1-3 minutes - Replace.

If the runtime is 20-25 minutes it’s time to order a replacement in the near future. 

Questions Ask . . . 👍

[jwood_ok]

Thank you.  We'll see if we can get eyes on it next week.