question

mysik avatar image
mysik asked

ET112 + Current Transformer - AC Loads reading

It's been a known fact that ESS system with ET112 as grid meter is responding very slowly to high load change and that the same system with CT clip is responding much quicker.

On the other hand ET112 is much more accurate in terms of energy usage calculations.

I thought it will make perfect sense to use both... CT to get fast responds and ET112 to get accurate grid usage readings. So I've wired up my system like on the diagram below:

ess-with-multiplus-ii.png

I've noticed that after connecting CT to Multi I'm getting fast responds to load as expected but, on the VenuxGX diagram my AC Loads has not been calculated correctly (the actual load is about 800W), the meter settings is set to Settings-->ESS-->Grid Metering-->External Meter

1655761151072.pngCorrect diagram, but AC Loads inaccurate

So to get accurate AC Loads readings I had to set Settings-->ESS-->Grid Metering-->Inverter/Charger, and now I'm getting accurate readings on the AC Loads, but the diagram is incorrect:

1655761099450.pngAC Loads correct, but wrong diagram

Is there a way to use both ET112 and CT clip and set this up to show correct diagram with correct AC Loads readings?

ESSEnergy Meterct
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I've always thought the same, CT sensor or response time, meter for accuracy but having this option for all connected items inc PV. Following with interest.
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6 Answers
mysik avatar image
mysik answered ·

UPDATE:

I was wrong about correct AC Loads calculation when the setting is set to

Settings-->ESS-->Grid Metering-->Inverter/Charger

As you can see from the screenshot, the energy that Multi is using to charge batteries is been added to AC Loads, so the calculation is wrong.

1655885275985.png

Anyone in the community is using ET112 and CT clip at the same time???

Maybe someone from Victron can answer the question if it is possible to use ET112 as grid meter and at the same time CT clip connected to Multi to get better respond to loads?

Would be great if we could use both at the same time and having correct diagram displayed and correct loads in the VRM Portal/GX Device


1655885275985.png (32.0 KiB)
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cookiemercedes answered ·

I checked the files after downloading the new drivers from ET112 configure but found nothing new because I don't know enough about Windows to thoroughly erase the old ones foodle

Which subfolder did you manually navigate to? Contrary to expectations, I have a hunch that it was RT112 for me. https://wordwipe.io

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What are you talking about?!?!
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paulo-m answered ·

I'm having the same problem (also on ESS). After adding the CT between the ET112 and the inverter to improve inverter response time, the AC loads reading is all over the place. This works well when the PV is not generating but once the sun is out...


Also the diagrams now show the loads on the AC out when they are all connected to the AC IN. This does not bother me as the inverter response time is now snappy but the readings on the AC loads needs some work.

My settings:
ET112's as grid meter and PV inverter on AC IN.
CT clip: Settings-->ESS-->Grid Metering-->Inverter/Charger

1655894660162.png 1655894763995.png


1655894660162.png (30.1 KiB)
1655894763995.png (36.4 KiB)
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paulo-m avatar image
paulo-m answered ·

update:
I've managed to fix the loads reading by moving in the settings the ET112 on the PV inverter to the "output" instead of in the "input". This works for me now as I only have on PV inverter on the system, but may not work with more. Ideally this should be fixed in code to match the physical setup but for now it kind a works.

What I've now noticed is that any current from the PV inverter to the batteries now counts as "consumption" on the VRM portal.

Can the clever programmers at Victron please fix this? Thanks

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zivillian avatar image
zivillian answered ·

For me it doesn't even work at night:1658785597934.pngAt midnight my battery supplies 1.2kW to the Multiplus, which (according to the image) converts it into hot air.

@Paulo M can you post a screenshot of the setting, which needs to be changed?


1658785597934.png (171.1 KiB)
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@zivillian My problem may have been different from yours. I had readings but they were not close to zero. Also read my latest update below for where the cause of my problem was.


How is your system connected? Simple parallel to grid with everything on the AC input? What are you using as grid meter? Do you use a current sensor?

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My setup is grid parallel, so the Multis are only connected at the AC Input. I'm using an Eastron SDM72Dv2 as grid meter and have added three current sensors.

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paulo-m avatar image
paulo-m answered ·

another update:
It seems that the incorrect consumption reading after configuring the PV meter (ET112) on output was my mistake as I forgot to tick the "use external current sensor" setting after adding the current sensor. This messed up all the readings. The problem I now have is that I can't move the PV meter setting back to the AC input where it belongs. The setting is stuck on AC output.

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