Copy ET112 meter in node red to simulate the panels on the other side of the house

Hi All,

Next to my Multiplus 2 GX I got an ET112 energy meter that registers/measures how much my solar panels generate on my barn.
But on my house I also have PV panels. To install a energy meter on them is quite a challange.

As the panels on my house generate 2,5 times more then my barn panels, I thought maybe I can simulate an energy meter in node red that “injects” 2,5 times what the other panels supply.

I have tried it like this:

But that doesnt work. The GUI will still show the value of then panels on the barn and not 2,5 that amount.

How do other do this?
(My PV inverters do not have the ability to communicate)