question

dutchsolarfreak avatar image
dutchsolarfreak asked

Multiplus II: Limit total current (PV at AC-OUT + Inverter) to 16A

Hello

Sorry for asking this question but I couldn't find the answer in the documentation or here on this forum.

I have a simple set-up with one MP and a AC-Coupled PV (2400wp).

I would like to connect this AC-Coupled PV to the AC-OUT of the MP.


I'd like to dynamically restrict the total current on the AC-IN to 16A.

So for example

  • In case the PV's are producing 10A, the inverter should only invert max 6A (if case there is a total demand of 16A)
  • In case the PV's are producing 4A the inverter should invert 12A (in case there is a total demand of 16A)
  • In case there is no solar the MP should deliver this 16A.

Can this be achieved by installing a Current Transformer for MultiPlus-II on the AC-IN Side and limit the inverter current in the MP to 16A?

Thanks for your help

Multiplus-IIAC PV Couplingac out 2
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5 Answers
Jason - UK avatar image
Jason - UK answered ·

@DutchSolarFreak The Multiplus has its own current sensor on the AC-In. Assuming you set up the Multiplus as a ESS, if you set a inverter limited to 16A, the grid would make up any loads over 16amp if you had no PV.

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dutchsolarfreak avatar image
dutchsolarfreak answered ·

@Jason - UK Thanks for your quick answer. So I don't need a additional current meter. That's nice.

But this ESS option "Limit inverter power" confuses me a bit. Especially the word "inverter".

I thought maybe that the DC-AC inverter current is limited to 6000W. Maybe it's not true....

For example what happens if 2400W (AC-coupled PV power) is supplied to the MP at the AC-OUT? Does the DC-AC inverter only "inverts" max (6000W-2400W) = 3600W?

So 6000W is the limit of the DC-AC inverter + AC OUT?

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dutchsolarfreak avatar image
dutchsolarfreak answered ·

@Jason - UK

Thanks again for your great support!

Do you know what this checkbox "Overruled by remote" means? Is there any setting in the CerboGX?

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Jason - UK avatar image
Jason - UK answered ·

@DutchSolarFreak
I have a schematic of my system in my VRM photos. I used to have a CT sensor on my grid supply then I realised I didnt need it. Then I added a EV charger so then I added a ET112 grid meter just so I can see my grid loads which are NOT supplied by the ESS via Power assist.
I have both a current limit on my AC-IN and also a inverter limit on my Multiplus like our above discussion but for different reasons.

The schematic is a little out of date as it doesn't show my 3 blueSolar 100/20 MPPT solar arrays.
https://vrm.victronenergy.com/installation/171934/share/db6807bb

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dutchsolarfreak avatar image
dutchsolarfreak answered ·

Thanks for sharing your set-up

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