Solar Photovoltaic (PV) cells or modules generate electricity from sunlight, which can be fed into the mains electricity supply of a home or industry or building or sold to the public distribution company connected to the grid. This will reduce the need for generation through fossil fuel technology.
Grid Interaction System:
The DC power generated from SPV panels is converted to AC power using a inverter and is fed to the grid either of 11 KV three phase line or of 220 V single phase line depending on the system installed at commercial or residential establishment. The SPV System generates power using the daylight, which is utilized fully by powering the captive loads and feeding excess power to the grid as long as grid is available. In cases, where solar power is not sufficient, the captive loads are served by drawing power from the grid. The grid- interactive rooftop SPV systems thus work on net metering basis wherein the beneficiary pays to the utility on net meter reading basis.
Non-grid interactive systems:
Require a full load capacity battery power back up system. This kind of system with battery back is viable at places where power supply is erratic or not available.