On Tue, 11 Oct 2022, Andrea Venturoli via Nut-upsuser wrote:

I've got an APC SmartUPS 1500: it's connected via USB and I'm using the usbhid-ups driver. This used to work properly until recently.

Now, when power goes out it keeps on going on battery potentially for several minutes, but, the moment line returns, I hear a click and power is cycled on the outlets (so every computer is rebooted forcily).

I'm thinking about a hardware issue, but could it be that NUT is instructing it to do so?

All I see in the logs before the nasty event is: "upsmon[89989]: UPS APC@localhost on battery". So I don't think a low battery status was reached and/or a shutdown initiated.

# upsc APC
battery.charge: 100
battery.charge.low: 10
battery.charge.warning: 50
...
ups.beeper.status: enabled
ups.delay.shutdown: 20

I do not see a line such as « ups.delay.start: 30 » in the upsc output. Is this UPS capable of reacting to an early power-return and cancelling the shutdown?

ups.firmware: UPS 08.8 / ID=18
ups.mfr: American Power Conversion
ups.mfr.date: 2014/06/20

How old is the battery?

ups.model: Smart-UPS 1500

It's difficult to say more without knowing exactly where you are in the sequence of events and the timing as listed in https://rogerprice.org/NUT/ConfigExamples.A5.pdf chapter 2.6 The shutdown story for a simple server.

Roger
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