GX different values grid vs AC loads

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herculess asked Dec 21, '21

GX different values grid vs AC loads

Hi,

My setup actually looks very simple and is just for updates and tests:

1xMultiplus2 5k:

AC-IN1 = grid
no AC-OUT1/2 connected
switch: charger only

PV charger = no PV array connected

no battery connected, PV charger is powered by Multiplus2

to measure grid loads a smartmeter is connected via modbus-tcp.

the problem is, there's a difference between grid L1 and ac-loads L1, but ther shouldn't
L1 ac-loads shows always min. >10W more consumption than the power meter/grid. L2 and L3 show's correct values.

Does someone know the cause of that? the value looks to me calculated, but why and where?

greets

Energy Meter

grid-vs-acloads.png (35.7 KiB)

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Answer 1 · 2021-12-24T13:58:47Z

Alexandra answered · Dec 24, 2021 at 01:58 PM

@herculess

One of the phases will have your system self consumption on it most likely.

18W seems about correct for an inverter and gx load. The value is most likely calculated not sure if you are metering both sides?

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Answer 2 · 2021-12-26T22:36:00Z

herculess answered · Dec 26, 2021 at 10:36 PM

i am just measuring the grid - which includes the self consumption of the inverter/gx etc.
so it is a software issue, that it calculates a value which isn't there.

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Answer 3 · 2022-04-23T18:44:09Z

neco-energies answered · Apr 23, 2022 at 06:44 PM

Hello, I have the same problem but more big difference.

Can you help me with that ?

Thank you

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Answer 4 · 2022-10-15T14:24:41Z

ted answered · Oct 15, 2022 at 02:24 PM

Same Problem sometimes... Happens in my case with a Dryer if i turn it on

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ted commented · Nov 08, 2022 at 05:44 PM

I checked the EM24 Phase order, it was L1-L3-L2 in my case. I fixed it, and all measured fine

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Answer 5 · 2022-10-15T18:22:45Z

Stan answered · Oct 15, 2022 at 06:22 PM

I have the same issue, but in single phase instalation.

I found out that voltage measured by MP2 is higher than in ET340 and also than I measured with multimeter. Difference is around +5V.

So maybe this is the issue for incorrect calculation of AC loads.

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