I have updated Main3 to Phase B and Main2 to Phase C as suggested. This then gave me the following results which may mean I need to reverse the CTs?
Solar was already set to allow negative and we have some sun so we should be able to get some readings soon. (Picture below of Solar generation as of 9.44 this morning. I think there is something else I need to tweak with solar as it thinks I am making 44 watts or so during the night so I think it might be reading a little high at present)
I will post some pictures of the board as I am assuming that
With the mains properly labeled
you mean with the configuration we have done vs any clues left by the installing electrician???
UPDATE: Added a picture with some solar happening