What do we mean by photovoltaics? The word itself helps to explain how photovoltaic (PV) or solar electric technologies work. First used in about 1890, the word has two parts: photo, a stem derived from the Greek phos, which means light, and volt, a measurement unit named for Alessandro Volta (1745-1827), a pioneer in the study of electricity. So, photovoltaics could literally be translated as light-electricity. And that’s just what photovoltaic materials and devices do; they convert light energy to electricity, as Edmond Becquerel and others discovered in the 18th Century.

When certain semiconducting materials, such as certain kinds of silicon, are exposed to sunlight, they release medium amounts of electricity. This process is known as the photoelectric effect. The photoelectric effect refers to the emission, or ejection, of electrons from the surface of a metal in response to light. It is the basic physical process in which a solar electric or photovoltaic (PV) cell converts sunlight to electricity. Sunlight is made up of photons, or particles of solar energy. Photons contain various amounts of energy, corresponding to the different wavelengths of the solar spectrum. When photons strike a PV cell, they may be reflected or absorbed, or they may pass right through. Only the absorbed photons generate electricity. When this happens, the energy of the photon is transferred to an electron in an atom of the PV cell (which is actually a semiconductor). With its newfound energy, the electron escapes from its normal position in an atom of the semiconductor material and becomes part of the current in an electrical circuit. By leaving its position, the electron causes a hole to form. Special electrical properties of the PV cell—a built-in electric field—provide the voltage needed to drive the current through an external load (such as a light bulb).

Photovoltaic (PV) literally means “light” and “electric.” Photovoltaic technologies are used to generate solar electricity by using solar cells packaged in photovoltaic modules.
The most important components of a PV cell are the two layers of semiconductor material. When sunlight strikes the PV cell, the solar energy excites electrons that generate an electric voltage and current. Extremely thin wires running along the top layer of the PV cell carry these electrons to an electrical circuit.
A photovoltaic module is made of an assembly of photovoltaic cells wired in series to produce a desired voltage and current. The PV Cells are encapsulated within glass and/or plastic to provide protection from the weather. Photovoltaic modules are connected together to form an array. The array is connected to an inverter which converts the Direct Current (DC) of the PV modules to Alternating Current (AC). Incase of energy storage or backup applications, batteries are integrated thro’ invertor to the Solar PV system as per the requirements.

A PV system that is designed, installed, and maintained well will operate for more than 20 years. The best way to ensure and extend the life and effectiveness of your PV system is by having it installed and maintained properly.

There are four main types of solar energy technologies:
1. Photovoltaic (PV) systems, which convert sunlight directly to electricity by means of PV cells made of semiconductor materials.
2. Concentrating solar power (CSP) systems, which concentrate the sun’s energy using reflective devices such as troughs or mirror panels to produce heat that is then used to generate electricity.
3. Solar water heating systems, which contain a solar collector that faces the sun and either heats water directly or heats a “working fluid” that, in turn, is used to heat water.
4. Transpired solar collectors, or “solar walls,” which use solar energy to preheat ventilation air for a building.

PV can be used to power your home’s electrical systems, including lights, fans, computers, printers, TV, Home Theatre, Music systems, Mobiles and other appliances. PV systems today can be blended easily into both traditional and nontraditional homes. The most common practice is to mount modules onto a south-facing roof or wall.

PV systems can be blended into virtually every conceivable structure for commercial buildings. You will find PV being used outdoors for security lighting as well as in structures that serve as covers for parking lots and bus shelters, generating power at the same time.

A photovoltaic (PV) system needs unobstructed access to the sun’s rays for most or all of the day. Shading on the system can significantly reduce energy output. Porportionate shadow free ground or roof top space required for installing the required capacity of Solar PV system. General thumb rule is 120 sq.ft space required for installing 1 kilowatt system.

The size of solar system you need depends on several factors such as how much electricity you use, how, the size of your roof, and how much you’re willing to invest. Also, do you want the system to supply your complete energy usage or to supplant a portion of your higher cost energy usage? You can contact us to determine what type of system would suit your needs.

Net-metering scheme is a policy (subject to State Govt. Approval) that allows homeowners / commercial building owners to receive the full retail value for the electricity that their solar energy system produces. The term net metering refers to the method of accounting for the photovoltaic (PV) system’s electricity production. Net metering allows homeowners / commercial building owners with PV systems to use any excess electricity they produce to offset their electric bill. As the homeowner’s PV system produces electricity, the kilowatts are first used for any electric appliances in the home. If the PV system produces more electricity than the homeowner needs, the extra kilowatts are fed into the utility grid.

Yes, it is approved by Govt. Of Tamil Nadu (order no. 3 of 2013 dated 13/11/2013 Under Tamil Nadu Solar Policy 2012 thro’ TNERC). The approved configuration for Net-meter installation as per below line diagram :

kWh (pronounced ‘kilo watt hour’) is a quantity term of electricity. 1 Kwh is identical to one unit of electricity that is shown on your electricity bill. An electrical item having a rating of 1kW will consume 1kWh(1 unit) for every hour if it is on at full power.

The solar PV panels generate direct current (DC), this is not directly compatible with the 240V alternating current (AC) that is used in your property. The inverter converts the DC power to AC power that can be used in your property.

Panels generally have an output guarantee of between 20 and 25 years depending on manufacturer. Inverters and batteries normally have a guarantee of 2- 5 years.

For a standard roof we use galvanized GI / MS structures that are fixed directly to your roof rafters. The brackets hook out from underneath to your existing tiles.

Approximate size is 2m x 1m dimension and weight will be around 20 – 25 kgs per panel

Solar PV panels are very robust and can withstand the normal stresses subjected by nature.

LT Commercial (LT Tarif V)
HT consumers (HT Tariff I to V)
• Special Economic Zones (SEZs)
• Industries guaranteed with 24/7 power supply
• IT parks, Telecom Towers
• All colleges & Residential Schools
• Building with a built up area of 20,000 sq.m or more
Note : Exempted categories – Domestic / Cottage Industries /Powerlooms/Agri/ LT Industrial

SPO can be satisfied by
• Captive Solar PV Power Plants • 3rd party Solar PV power consumption
• Purchasing Renewable Energy Certificate (REC)
• Purchasing Solar PV power from TANGEDCO

The consumer has to pay a penalty of Rs. 13.40/= per kwh (forbearance price of REC)

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