Qcells Q.HOME CORE H4 Guide Rapide D'installation page 38

11.7 CT Wiring in AC coupled
CT is needed in A4 only. H4 do not require CT installation.
Attach a CT to the wire from the PV inverter to the grid (K
PV Inverter
Main
Load
38
(Default 3 m or Option 20 m)
Ext. CT port
CT
L).
CT Cable
L1
Grid
N
Energy
Meter