Hi, I recently replaced my older APC BE550G with a new APC BE650G2-GR, connected via USB to my QNAP TS-464. The UPS is correctly detected by QTS and works normally. However, I have occasionally seen a brief USB communication interruption in the QNAP system log: “USB UPS unplugged” followed appro…

I have seen this myself with cyberpower UPS. There was plenty of discussions about it in the old forum, try a powered USB hub in between.

I’m not familiar with the new UPS yet. But you’ll probably have to connect it to the PC at some point and check the settings there. Maybe the UPS runs a self-test or something similar from time to time.

There is actually a topic here as well [image] USB UPS Disconnecting - TS-873A QUTS Hero Compatibility Hey all, Wondering if anyone might have any solutions to this one. I’ve noticed a couple of times that my USB UPS (PowerShield Defender) has been randomly d…

Could you first try adding a powered USB hub, as suggested by other members here? If that resolves the issue — or if you run into anything else — feel free to let us know. Thanks!

Yes, I already ordered a powered 2.0 hub, I will try it. Meanwhile I asked Qnap to put my APC UPS model on the compatibility list to support officially however it can take a while, I saw on the list many UPS devices already old and outdated…

APC UPS BE650G2-GR with QNAP TS-464 – experiences?

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dolbyman September 21, 2026, 5:59pm 4

There is actually a topic here as well