Thank you very much for the detailed answers.
I meant clamp as in the CT itself not the act of clamping it 
Apparently that goes to the red/yellow isolator in the pic below and then to the inverter.
The BMS is inside the battery unit and communicates to the inverter via a cable.
The inverter has an rs485 port where the current wifi logger is connected - I’m trying to find out a way to piggyback off of it so be able to pull rs485 and send data to the Solis cloud - this will give me the battery values if I can get it to work as people have done here: Getting data from inverters via an RS485 connection - #26 by boydo
The value of this is positive when drawing from the grid and negative when exporting to the grid from the solar, is that enough?
Please share the link and I will do the reading
The setup looks like this:
There’s another digital meter inside the little box to the right side which is not fully visible