As promised a final update on my issue.
With some considerable help from Nick on this community, we have this resolved.
The short version is; it doesn’t work as I hoped when two units are connected in parallel when using an external CT.
The solution is to add a proper grid meter, and set both MultiPluses to use their own internal CTs.
It adds an extra £150 to the project, but I accept it is a much better and more elegant solution.
