[Nut-upsuser] HP R3000XR high reactive power (capacitive)

[Manuel Wolfshant]

Hello

Given its age, I strongly suspect that your device is trying to tell you that you should replace at least some if not all the electrolytic capacitors

Regards,

wolfy

On September 20, 2023 9:40:20 PM GMT+03:00, "Marek Michałkiewicz" <marekm at amelek.net> wrote:
>The UPS from 2004 still works fine otherwise (and I can monitor it with NUT using the "bcmxcp" driver, see below).
>BTW, still looking for a firmware update - SP54628.EXE is not available anywhere, even though its SHA256 is known.
>But, with or without load on the outputs, the UPS itself draws about 500 VAr of capacitive reactive power from the mains.
>Has anyone else seen this?  Is this normal for these units, or just my unit faulty in some way?
>You can see it as input current (3.6A) larger than output current (2.7A), at no load these readings are 2.2A and 0.0A.
>But there is no high power loss, nothing is smoking etc. it's just a large phase shift between voltage and current.
>Reactive power is not charged here most of the time, but the utility company reserves the right to do so if there is too much, especially capacitive (inductive they seem to like better).
>The allowed limits are tan(phi)=Q/P in the range from 0 to 0.4 where P is active power in W (+ consumed, - produced) and Q is reactive power in VAr (+ inductive, - capacitive).
>Yes, the meter here is bi-directional (and remotely read by the utility) as I have a small on-grid PV power plant here, to help reduce electricity bills.
>Another older UPS (Liebert GXT2-3KRT230E) had higher power loss (lower efficiency), but its power factor was purely resistive.
>
>$ upsc r3000xr at localhost
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