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.
 
Ver 2 Single Phase zappi comes with one wired CT clamp as standard.
Ver 2 Three Phase zappi comes with three wired CT clamps as standard.
 
CT clamps come with a 5m cable
If a longer cable is required it can be extended using CAT5 Ethernet cable (to a max of 100m) or consider using the myenergi harvi to connect the CT over wireless.