Multiplus II Current values inaccurate when compared with energy meter

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anieuwstadt asked Nov 15, '22

Multiplus II Current values inaccurate when compared with energy meter

Hello,

System description:

2 paralleled MP II 48/5000s
Single phase
ET112 energy meter
All loads on ACout1

The current reading of the ET112 is quite different to that of the MP II current sensor. The differences point to possibly a calibration and a scaling issue. It appears that ET112 is correct when compared to a clamp meter, which means that the MP II is most likely incorrect.

Blue circles are when the grid fails, and both read Zero
Magenta circles highlight examples of variances

The same phenomena are being seen on other systems as well, with various versions of inverter firmware. Single and 3 Phase systems, all with the MP II 48/5000

How can this be fixed?

Multiplus-II input current

1668495397737.png (97.8 KiB)

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Answer 1 · 2022-11-15T07:19:54Z

Rob Duthie answered · Nov 15, 2022 at 07:19 AM

Hi

This is expected and known, the current coils in the victron are not that accurate, as they are not a metering device were as the ET112 is a proper metering device with a high class accurate rate.

Also the clamp meter is worse, so dont expect much as per Victron documents its only a rough estimate its not a measuring METER!!! as such

Regards

Rob D

NZ

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gnagflow commented · Nov 15, 2022 at 06:19 PM

Can’t believe that the Multiplus has a 2 Amps inaccuracy,

i compare the Victron current values regularly with bms values, and most of the time they are very similar.

who cares: everyone who want to know if the data shown could be real. I am very interested in those differences.

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anieuwstadt commented · Nov 17, 2022 at 06:55 AM

Hi Rob,

I have not had issues with the clamp meters that you have spoken of. In this case, the ET112 and the clamp meter are very similar.

Inaccurate measurements will have a negative bearing on the correct operation of the proportional–integral–derivative control loops inside the inverters and the Cerbo GX.

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