How to Connect Inverter with RCBO ?

I have main connection of 4KW , I wanted to put a RCBO - 32 A ( 30 mA - 2 pole - Siemens) , I also have a inverter of 800VA , which will auto connect to my lighting and some smaller loads i.e loads like refrigerator,Water Pump,AC , Iron , water Heater,Microwave will be excluded from inverter.

My electrician suggested like the RCBO will be put on the mains , and the inverter will be feed into individual MCB's. I felt like this will make the RCBO to trip as there will always a difference of current RCBO will detect.

Please let me know if I am correct . if correct how do I protect my circuit using RCBO , at the same time , I should be able distribute the inverter power to appropriate appliances.A small example will be of immense help to me.

Looking forward to your help

Sujit Roy