Transformerless inverter grounding

I would like to confirm the idea that, for transformerless inverters, the PV grounding system's point of return (i.e. where the neutral and ground are connected) should be in the same panel where the PV system is connected. In other words, connecting the PV grounding system to the existing grounding system, if the PV system is connected to a subpanel for instance, could lead to tripping of RCDs upstream of the inverter, up to the main panel.
Comments
What you do not want are parallel current paths--Some "return" current flows in the White wire (US) and other current flows in Green Wire/conduit fittings. You can get problems with over heating green wires/conduit connections/metal electrical boxes if that happens.
-Bill
I believe you are in Lebanon (or nearby)? I do not know how your electrical systems are installed there...
However, a transformerless vs transformer isolated GT inverter would not change the AC subpanel/mains wiring requirements.
In many countries, as I understand, the neutral is either "floating" or bonded at the utility distribution transformer. In the US, the neutral is bonded both at the pole transformer and at each home in the Main AC panel (to local home cold water pipe, ground rod, etc.).
In the US, GFI (ground fault interrupter or residual current breakers) are only installed on "branch circuits" (wires from banel breakers to final wire runs (or in the electrical outlets themselves).
-Bill
I think you are a bit off base here. You refer to things like "PV neutral" , "neutral ground bond". None of these terms are relevant to transformerless inverters.
Also you CAN connect a TL inverter to a "sub panel" , in fact larger systems are almost always done that way
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