Cos. Phi or Power factor Energy Meter VM-3P75CT

Q&A and troubleshooting
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1

Recently updated the VM-3P75CT

v1.09 – 12 August 2025

Changes/features added:

- Add power factor and phase sequence reporting. Visible in the GX device, VRM Portal, and the VictronConnect app.

- Reduce required GX Device CPU load when using meters for PV Inverter, AC-load, or other types of metering and connected using VE.Can wiring. The same improvement for connected using Ethernet wiring was already available per Venus OS v3.60, released before the summer of 2025.

- Add phase rotation warning for 3-phase configuration, visible in the VictronConnect App.

- Improve overall measurements accuracy.

- Fix total power reporting for absolute and arithmetic registration. The most used type of registration, vector, was not affected by the issue.

- Make Ethernet communication more robust.

In my case the analyser is in the mains connection situated and i want to be able to see what the Cos.Phi (or maybe presenting as P.F. . ) is.

question is how to present the value(s) (in 4 kwadranten? )

2

So far the value is only visible in VictronConnect and Node Red it seems.
I’m suspecting the device is reporting it upstream, but VRM and the GX don’t have the UI fields to actually display it yet.

What I’m missing is an indication if the Cos Phi / PF is capacitive or inductive.

By the way: firmware v1.10 has been released as well.

3

Hi @phaseshifter and @BartChampagne, the VM-3P75CT uses the IEEE sign convention for its reported power factor. The sign of the power factor in combination with the sign of the real power indicates in which quadrant the system is operating, and thus if the system is nominally capacitive or inductive.

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4

So we have to be patience for Victron to present in VRM!

I am happy to see the unit is in P.F. in stead of Cos. Phi.

Imho;

P.F. as reference will make an generator voltage control more accurately adjustable when I-thD in the loads are involved.