submitted 1 month ago by dieTasse@feddit.org to c/selfhosted@lemmy.world

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Hi all, What is UPS input load and how can that affect the power draw of devices plugged into it?

Context: I have an Eaton UPS. Into it I plugged TP Link smart plug to measure how much my homelab draws (1 truenas server, 1 rpi and a switch). These draw about ~29 W when under low to medium load. Almost every day (different time) for couple of hours, however, the plug measure about 6-7 Watts more (~36 W). I have checked both linux devices and they were doing basically nothing. Then I looked into TrueNAS monitoring and noticed that the start and end of each event is exactly the same time when UPS input load is increased from 0 % to ~6 %.

What is this UPS input load and how is it possible it affects measurements by a device that is plugged into it (the UPS) - NOT the other way around? Thank you

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[-] Strit@lemmy.linuxuserspace.show 2 points 1 month ago

So what is the TrueNAS server doing at this time? Have you checked the logs?

I would image it might be some backup, snapshotting or optimization.

[-] dieTasse@feddit.org 1 points 1 month ago* (last edited 1 month ago)

Truly nothing. I haven't set snapshots yet, I have TrueCloud backup but thats at midnignt. I have checked htop and there is virtually zero activity (same as when the power draw is 29 W). I have only two apps on truenas and they also didn't do any indexing or anything). As mentioned above the only difference that I spotted so far is the ups input load and the times of event start/end match perfectly in all cases (but then again UPS is powering the tp plug and on, not the other way around).

this post was submitted on 16 May 2025

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