but local regulations DONT require it, the use of an RCD can be avoided quite easily usually, so I dont know if you could argue that point,SolarEdge inverters installation instructions state that if a rcd is required by local regulations then one must be installed. However it would have to be seperate from any other circuits. Not randomly stuffed into a spare way on the rcd side of a board.
anyway, thats fairly irrelevant as its still not permitted to feed PV from the load side of an RCD supplying other circuits.