I have a studio[flat] and garage run off the house supply.
Solar panels on roof of garage, so solar feeds via its control unit into the studio sub-board.
Electrician put in MCB to supply/protect mega ducted underground cable to studio sub-board.
There is a lot of potential load here with water heater, mini induction hob, ring main, lights, etc.
I have been recommended to have RCBOs in the studio/garage circuits to protect and isolate them individually;
tho not for the circuit feeding the solar.
I am concerned at the lack of discrimination between MCB in house and RCBOs in studio.
What is the preferred option for this sort of circuit?