In grid connected rooftop or small SPV system, the DC power generated from SPV panel is converted to AC power using power conditioning unit and is fed to the grid either of 33 kV/11 kV three phase lines or of 440/220 Volt three/single phase line depending on the capacity of the system installed at institution/commercial establishment or residential complex and the regulatory framework specified for respective States.
These systems generate power during the daytime which is utilized fully by powering captive loads and feed excess power to the grid as long as the grid is available. In cases, where solar power is not sufficient due to cloud cover etc., the captive loads are served by drawing power from the grid. NET METERING: The grid-connected rooftop system can work on a net metering basis wherein the beneficiary pays to the utility on a net meter reading basis only. Alternatively, a bidirectional energy meter can also be installed to measure the export and import of power separately. The mechanism based on gross metering on mutually agreed tariff can also be adopted