Alpha ESS SMILE-G3-S5 Manual page 41

7.4.4 CT Connection
We provide a Grid-CT cable and a CT accessory for DC-coupled systems.
Insert the registered jack of the Grid-CT cable into the Grid-CT port on the
inverter
Connect the other end of Grid-CT cable with the CT.
Buckle the Grid-CT on the live wire of the house.
For AC-coupled systems and Hybrid-coupled systems, another PV-CT is required . Buckle
the PV-CT on the live wire of the PV inverter connecting point and insert the registered
jack of the PV-CT cable into the PV-CT port on the SMILE-G3-S5-INV.
NOTE:
The arrow of the CT should point to the grid port of the inverter from the
grid or the PV inverter.