I have a site that uses a VM-3P75CT Energy Meter but the reading is not stable (see film). Is this normal behavior? I can imagine that this kind a measurement makes it hard for the multiplus to regulate the grid current. The solar micro inverters are from enphase and measured with a victron ac curr…

Looks normal to me, i have an em540 that does that too, bit slower but looks similar

Okay. It also messes up vrm readings.

How are the readings of the phases?

It’s just 1 phase in this situation.

Hi @JeroenSt , I believe what you are seeing is something Enphase calls “Burst mode”. At low-light conditions, the micro-inverter charges an integrated capacitor, and once the capacitor is full, the micro-inverter injects a power pulse for a single or even halve a grid cycle. Since the VM-3P75CT ha…

To add: its possible that this makes the Victron ESS less stable than desired. Which we’d like to have a look at. @JeroenSt , is it OK if we enable some detailed logging to an internal diagnostics system? What it means for you is more traffic over internet while we have that enabled. Thanks, Matth…

My MP2 (single unit on L1) + VM-3P75CT also does this. There is as much as 100W of fluctuation/oscillation. Feel free to remote debug/use as much data as you want if you need another test setup.

Yes that’s fine, VRM Site ID 719245

That is a lot less than the 600 watt fluctuation I see. It will always regulate a bit because it’s impossible to keep in at a constant value.

Energy Meter VM-3P75CT fast fluctuating measurement

Q&A and troubleshooting

JeroenSt 12 July 2025 14:45 6

After the charging has finished the reading is stable. Looks like the multiplus 2 and the VM-3P75CT are in some kind of resonance loop.

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Energy Meter VM-3P75CT fast fluctuating measurement

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