Thank you brother, for your valuable comments and suggestions.
I have presented this diagram in a simple way for beginners to understand the basic workings of solar power.

What you mentioned is absolutely correct — MCB (Miniature Circuit Breaker) is an important safety device that protects the system from short circuit or overload. Generally, small-scale domestic solar systems are often controlled by the on-off switch of the inverter, but adding MCB is definitely a safer and more professional method in terms of safety.

I will definitely update the next diagram with the exact location of MCB, so that beginners can better understand and safely build a solar system.

Thanks again, if you want to give any further guidance, I will gratefully accept it.