should I use communication cable between two 5.5kw inverters that are not parallel and on same phase. how to use ct coils of both inverters.
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For grid tie inverter , all inverter from same grid even at the neighbors are parallel because on the same phase from same grid provider but no need to communicate between inverter, these inverter simply shutdown by antislanding protection.
But if you use "UPS" output of several inverter in parrallel you need to have com to avoid unbalancing curent and sync control.
For sunsynk if you connect only the grid side,you can put several inverter on same grid without com and no pb even connect different load to output but never common wire from these load.
// are for connect same load (UPS side) or/and same battery or to have capacity redundant upgrade