The vrm dashboard gives wrong values for critical loads: 2153W, PV gives 2021W and the battery is charging at 1078W. The normal value for critical loads should be: 2021-1078=943W.

No load at the AC load output, I don’t no why this gives 31W. The system is 3 phase with 3MP-II, grid meter and PV meter.

This is regular “AC-Load-Ghosting”, It appears, if the values reported by the grid meter do not align with the values measured by the Multi. This can happen due to timing and/or calibration issues. Any “offset” of both measurements will be considered AC-Load. (I.e. If Meter says 200W, Multi measures 100W → There has to be a 100W consumer on AC-In)

Is the PV-Meter reporting it’s power on the correct phase it is attached to? (If single phased)

Because this is a 3 phase installation, I don’t think that it is needed to specify the phase where the pv single phase meter is installed. The power values in the vrm dashboard are the totals of all phases. Still the problem stays the same!

It will have an impact:

Assume, you have a REAL load of 200 Watt on each phase and your PV is feeding in 600 Watts.

Now, that 600 watts is reported to be on Phase 1, while it actually feeds in on Phase 2:

The system will now “measure” the following values:

L1: 200 Watt

L2: -400 Watt

L3: 200 Watt

Now, due to data it would first assume, that the 600 Watt of the inverter beeing REPORTED on Phase 1 are consumed directly, leading to:

L1: 200 Watt + 600Watt = 800 Watt

L2: -400 Watt

L3: 200 Watt

Second, it would conclude, that on L2 there can’t be a negative Power. So it will report:

L1: 800 Watt

L2: 0 Watt

L3: 200 Watt

Overall consumption now comes down to 1000 Watt displayed, while in reality it’s 600 Watts.

I would assume that a single phased inverter is assumed to feedin on phase 1. So, if your inverter is connected to any other phase, you should switch it to phase 1.

I just have checked the phases and the pv is connecte to phase 3. I will check if i can change this. A better solution would be that a single phase meter could be set on any phase in the cerbo, instead of assuming it’s on phase 1. Imagine you have more then one pv meter all on different phase in order to distribute the pv power, the the dashboard power values would even more incorrect.

True that. But I also don’t see any option for that.

Guess “1 phased stuff” is made for single-phased systems. In a 3 phased system, your only option would be to use a 3 phased meter, where you leave 2 phases disconnected. (But obviously a pricy option over making this configurable through software)

Hi Dognose, I have put the pv meter onto phase one, and now It seems that the power value’s are correct.

Thanks for your help

Wim

Awesome, thanks for the positive Feedback

Glad these professional electricians to switch phases have a short time to respond nowadays

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