Off grid solar systems on the general grid work in full independence of the electricity grid network and depend in this respect on the batteries for storage of energy and use of it to supply the electric loads at night.
The off grid solar systems are the mostly used and widest in spread in the world nowadays, and they are the optimum choice of the safety and control systems and communication systems. They are also used in the field of petroleum.
These systems are distinguished by that they can be installed anywhere.