zappi & eddi come with one wired CT clamp as standard.
The 22kW 3-phases zappi come with 3 CTs as standard.
If you would like to see real-time generation from your solar/wind system displayed on the LCD display of your product. You’ll need an additional CT. (additional option)
In some cases, extra CT clamps are required i.e for 3 phase installs.
The CT comes with a 5m cable.  If a longer cable is required it can be extended using CAT5 Ethernet cable or why not consider using the myenergi harvi to connect the CT over wireless?