THE SOLAR GRID-CONNECTED REVOLUTION ...
AN ERA OF DISTRIBUTED ENERGY RESOURCES HAS ARRIVED
The Solar PhotoVoltaic Technology has been gaining widespread adoption because of the Net-Metering System which is now enabled by almost all the Utilities & Discoms in the country. A brief description of this system is as follows:
1) SOLAR ROOFTOP POWER PLANT : The Solar Radiation containing photons strike the PhotoVoltaic Panels. Due to a phenomenon known as 'PHOTO-ELECTRIC' effect, there is a DC current flow from the panels onwards. A Grid-Interactive Inverter converts the incoming DC current into usable AC current.
2)APPLIANCES/LOAD : The AC power generated from the Solar Rooftop Power Plant is connected to the power distribution point of the building. The Generated Solar Power is utilized to power your appliances and loads.
Case 1 : Solar Power > Building Load - Excess power flows from the power distribution point of the building to the Utility Grid through Bi-Directional Meter/Net Meter.
Case 2 : Solar Power < Building Load - Needed power flows is supplied by the Utility Grid through the Bi-Directional Meter/Net Meter.
3)BI-DIRECTIONAL METER/NET METER : A very important piece of measuring equipment in a Grid-Connected Net-Metering system is a Bi-Directional Meter/Net Meter which is installed replacing the existing Energy Meter of the building. The Bi-Directional Meter/Net Meter shows/dispalys three readings namely, 1. Import, 2. Export, 3. Net which inturn keeps account of excess power and power supplied in 'Case 1' & 'Case 2' respectively.
4)UTILITY GRID: Your existing power/service connection from the local utility/discom serves a dual purpose. Apart from supplying you electricity during 'night' or 'when the sun in not shining' or 'peak power consumption(Case 2)', it also accepts the excess power generated (Case 1) and provides you with excess unit credits which is displayed on the Bi-Directional Meter/Net-Meter.