On grid/ grid-connected photo-voltaic power system is an electricity generating solar PV power system that is connected to the utility grid. A on grid system is consists of Solar PV Modules, one or several inverter, a power conditioning unit and grid connection equipment. They range from small residential and commercial rooftop systems to large utility-scale solar power stations.
In areas where net-metering policy is in place, the energy generated by a grid connected solar plant is recorded by the bidirectional energy meter which is installed on site and on grid system feeding excess power that it makes back to the grid and your electricity meter going backward. The net import and export of electricity will be adjusted per billing cycle.