Just been thinking through RCD selection for domestic electrical systems with solar installed.
Standard practice seems to be in most cases to connect the solar system to a separate consumer unit with type A or type B RCD depending on the inverters specification. Then not worry too much about the RCD's in the existing installation.
Just thinking this through. This seems to assume the risk is that the solar system creates DC leakage as a load and pulls some DC from the grid and has negligible impact on the main CU.
But does the solar system actually generate some DC current in the supply that could then feed in to the main consumer unit, even if the loads are only resistive and therefore create risk of blinding the downstream RCD's, especially if running in island mode?
Is this a negligible risk or something industry just hasn't thought about?