Are your batteries toast? Verify if you don't know. I've only seen that when the batteries are well past expiry, it's literally just the batteries running as long as they can.
The standard SLA batteries typically put in UPSs are meant to be replaced every 3 or 5 years, LiIon typically will last roughly twice that or more with proper care.
Sounds like a battery issue, when load is applied its voltage is falling rapidly, which is kicking off the shutdown cycle.
Had the same with my Eaton. Replaced the battery and all is working fine again. As others said, it’s likely your battery voltage dropping off sharply under load.
Check for firmware updates to the network card AND the UPS.
I had an issue recently where my 5PXG2 was claiming the batteries had failed after less than a year. I talked to support and they said update. As soon as I did, the errors cleared and the UPS started UPS-ing again.
Figure anything out, OP?
Nothing yet! I've got a call set up with Eaton support on Wednesday this week though to work through it :)
I'll be sure to report back to the thread with the solution, once it's identified.
Had the call with Eaton support today. Very nice guy that called me exactly on schedule. We walked through the issue and he recommended going to through the menu on the UPS to change Settings -> Battery Settings -> Battery Charge Mode from ABM Cycling to Constant Charge. His theory was that it could be doing the ABM cycling at the point I was doing my "unplug the input" test, and thus the battery was already low enough to trigger my under 80% and under 10% shutdown sequences. I was skeptical, since the battery indicated it was at 100% charge and the shutdown sequence start was triggered within 30 seconds of unplugging the main input. He said that the battery level indication isn't how much charge the battery has, but how much power is going to the battery. That would seem surprising to me though. Monitoring indicates the battery is at 99% when after unplugging the main and the shutdown sequence starts. He advised to try the test again ~5 hours after changing this Battery Charge Mode setting. 5 hours later, I tried the test, and had the same result with the shutdown sequence being initiated immediately upon unplugging the input main.
Gonna reach out to them to figure out the next steps.
