The term off-the-grid (OTG) or off-grid refers to living in a self-sufficient manner without reliance on one or more public utilities. Off-the-grid homes are autonomous —they do not rely on electrical power grid or similar utility services. A true "off the grid" or "off-grid" house is able to operate completely independently of all traditional public utility services.
How to provide you off-grid system:
We would like to give an example in Roma, Italy.
Find a few of your utility bills. On the bill you will see a monthly kilowatt-hour (kWH) rating, which is the amount of power you use each month.
Conduct system design report for clients reference, which including amount of power each system will produce.