Sorry - should have given model number! It is MKS-5K-B
I have been given some useful help by Yani who writes the MultSIB software. Happy to share setup details.
The one remaining problem is that the system correctly swaps to GRID (USB) after using batteries at night, but then does not swap back to SBU mode in the morning. I am trying to get the system to set higher priority for the battery than Utility, but the mode remains stuck in SUB (Solar-utility-battery). I can manually switch to SBU but that means it would not automatically use batteries for the first part of the night.
You will note that the system is currently in SUB mode which happened at approx 8h10 when solar PV was enough to take over the load.
It would be nice for the system to be in SBU mode!
Has anyone else succeeded in an automatic switch to SBU??
David.