[Nut-upsuser] Low Battery Problems

Mike Dillinger miked at softtalker.com
Tue Jun 23 01:13:27 BST 2020

> *From:* Charles Lepple [mailto:clepple at gmail.com]
> *To:* Mike Dillinger <miked at softtalker.com>
> *Cc:* nut-upsuser at alioth-lists.debian.net
> *Date:* Monday, June 22, 2020, 5:19 AM PDT
> *Subject:* [Nut-upsuser] Low Battery Problems
> I’d recommend a battery test. Starting the test via the front panel should be sufficient, or you might be able to do it with upscmd.
> This should let the UPS firmware discharge the battery a bit, and see how long it should last.
> Conceptually, “OL LB” is not inconsistent- it means the UPS has AC power, but the battery state of charge is reading low (as might happen after the UPS restarts after an extended power failure) . You might have a CPS unit where the battery voltage returned to NUT is hard-coded to 24.0 V, which is annoying, but should not affect internal decisions about shutdown. Example: https://networkupstools.org/ddl/Cyber_Power_Systems/CP1500PFCLCD.html and https://github.com/networkupstools/nut/issues/459#issuecomment-325163688

Thanks for the information.  I did initiate a deep test and it finished successfully.

I spent a fair amount of time look at this issue this weekend and ended up lowering override.battery.charge.low from 60 to 40 and the problem went away.  I haven't had any of the "OL LB" warnings since changing that threshold which has not been the case for a while now.  I think I'll try bumping override.battery.charge.low back up to 60 after running the test that you suggested and see how that works out.

Thanks again!

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