Grid connected PV systems, as the name suggests, are connected to the electric utility grid. The ground mounted power Grid connected plants have size usually greater than 1 MW and feed electricity into the grid. The roof mounted grid connected plants have sizes from 1 kW onwards but are mostly less than 250 kW and are usually for captive (self) consumption. There is no electricity storage (battery) with these systems and therefore these can provide electricity only in the daytime. One drawback of this system is that it does not provide the electricity when the grid is down and works only when there is supply from the grid. It reduces the load on the grid by as much power as it is generating. It means they are suitable only for areas which have less number of day time blackouts.
What is a grid-connected solar system?Rohit Arora