question

marekp avatar image
marekp asked

Strange VRM look with external power meter

I have a problem with the way VRM is displaying dashboard.

When I select "external grid power meter" (EM24) dashboard looks as follows.

screen-shot-2021-06-04-at-104625-pm.png

When I select Inverter/Charger as a grid power meter dashboard look as follows.

screen-shot-2021-06-04-at-104448-pm.png

Someone told me that it is correct behavior (the layout not the numbers), but my system looks like below:

setup.jpg

There is no load between grid_power_meter and MP-II so why I have power going to AC-loads?

All my loads are on the Essential AC loads.

Any suggestions?


VRM
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2 Answers
markus avatar image
markus answered ·

Double check your EM24 wiring. BR

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marekp avatar image marekp commented ·

Hi Markus,

Can you explain why this numbers are more or less ok?

Here EM24 is wired the same and is used as a grid power meter.

screen-shot-2021-06-04-at-20512-pm.png

Here only 16W are "missing in action".

3633 - 390 - 3051 - (195*0.9) = 16


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markus avatar image markus ♦♦ marekp commented ·

Imagine the influence, if grid export is reported as grid import and vice versa by the meter.

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marekp avatar image marekp markus ♦♦ commented ·

You are suggesting that 67W should be -67W and it is equal to 790W?

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markus avatar image markus ♦♦ marekp commented ·

I don’t know what you mean.
I am suggesting, that in the picture above grid- should be +

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markus avatar image markus ♦♦ markus ♦♦ commented ·

You have no AC loads

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marekp avatar image marekp markus ♦♦ commented ·

How about this.

Here you can see measurements from the different power grid meter and EM24 at about the same time.

My power meter is measuring every second when EM24 shows numbers every 3-4 seconds.

screen-shot-2021-06-05-at-120533-am.png

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markus avatar image markus ♦♦ marekp commented ·

Maybe Phase mismatch between EM24 and your Multis?

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marekp avatar image
marekp answered ·

Just to update.

There was a simple reason for the wrong numbers.

Problem was fixed by swapping phases L1 and L3 on the LM24 power meter.

Below the numbers after fixing this problem.

screen-shot-2021-06-05-at-92850-pm.png


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