We can harness the energy of the sunrays using solar panels. When sunlight hits the solar panels, they convert the photons in the sun’s rays into electrons thereby creating direct current (DC). The electrons flow out to an inverter which then converts them into alternate current (AC) that can be delivered over long distances for distribution with minimal loss to the transmission wires.
A net energy meter keeps track of all the energy your solar system generates and supplies to the National Grid. Your day to day use of electricity will be directly from the National Grid as normal. The energy the National Grid absorbed from you will be used by them to distribute electricity nationally. At the end of a billing cycle, the CEB will charge you only for the deficit of electricity units (Kwh) used and supplied and charge you for the difference. You can zero the bill, and now the CEB has implemented a 'Net Pay' system to pay you for the excess energy suppied from your solar energy system.
Solar cells are small, square-shaped panel semiconductors made from silicon and other conductive materials, manufactured in thin film layers. When sunlight strikes a solar cell, chemical reactions release electrons, generating electrical current. Solar cells are also called photovoltaic cells or "PV cells" and can be found on many small appliances such as calculators.
A PV system components include PV modules (group of PV cells), which are commonly called Solar panels; one or more batteries; a charge regulator or controller for a stand-alone system; an inverter to covert solar power from direct current (DC) to the alternating current (AC) of the utility grid-connected system; wiring; and mounting hardware or a framework. A PV module arranges individual PV cells, and the modules are grouped together in an array. Solar panels can also be set on special tracking devices to follow the mpvement of sunlight to improve system efficiency.
INCORPORATING PV SYSTEMS
PV systems today can be blended easily into both traditional and nontraditional homes, powering appliances and electric systems. PV cells can be installed as a stand-alone module that is attached to your roof or on a separate system, or using integrated roofing materials with dual functions - that as a regular roofing shingle and as a solar cell making electricity. PV systems likewise can be blended into virtually every conceivable structure for commercial buildings. You will find PV used outdoors for security lighting as well as in structures that serve as covers for parking lots and bus shelters.
A photovoltaic (PV) system needs unobstructed access to the sun's rays for most or all of the day to be effective. Shading on the system can significantly reduce energy output. Climate is not a major concern because PV systems are relatively unaffected by air temperatures, and rain cover typically dry quickly because panels are positioned directly into the sunlight. Abundant year-round sunshine makes solar energy systems Extreamly effective nearly everywhere in Sri Lanka.