Use this CT clamp with a solis inverter to limit export to the grid. G100 compliant.
The cable supplied is 10m - 2c 0.2mm^2 with 300v insulation
If you want to extend with another 40m of cable (total 50m) use - 2c 0.5mm^2 with 300v insulation.
Ideally shielded cable and not in AC conduit. ie. CAT6