Monday, 30 September 2013

Photovoltaic Panels

Monocrystalline cells are cut from a single crystal of silicon- they are effectively a slice from a crystal. In appearance, it will have a smooth texture and you will be able to see the thickness of the slice.
These are the most efficient and the most expensive to produce. They are also rigid and must be mounted in a rigid frame to protect them.

Sunday, 29 September 2013

Solar Panels - Photovoltaic Panels

PV cells are made of silicon, similar to that used in computer "chips". While silicon itself is a very abundant mineral, the manufacture of solar cells (as with computer chips) has to be in a very clean environment. This causes production costs to be high.

A PV cell is constructed from two types of silicon, which when hit by solar energy, produce a voltage difference across them, and, if connected to an electrical circuit, a current will flow.

Photovoltaic cells or panels are only one way of generating electricity from solar energy. They are not the most efficient, but they are the most convenient to use on a small to medium scale.

A number of photovoltaic cells will be connected together in an "Module", and usually encapsulated in glass held a frame which can then be mounted as required. The cells in a module will be wired in series or parallel to produce a specified voltage. What may be referred to as a 12 volt panel may produce around 16 volts in full sun to charge a 12 volt battery.

In most cases, a number of panels (modules) will be connected together to form an "Array". Panels of a similar type may be connected in series to give a higher voltage (two 12 volt panels may be connected in series to produce 24 volts). Usually a number of panels will be connected in parallel to give an increased current.

Thursday, 26 September 2013

Tuesday, 24 September 2013


  • SPV System design, installation and service.
  • SWHS design, installation and service.

more info @

Monday, 23 September 2013


  • Solar Water Heater - Domestic
  • Solar Water Heater - Industrial
  • Solar Collectors
  • Solar Air Heating System - Dryers
  • Solar PV Modules
  • Solar Home Lighting Systems
  • Solar Power Pack
  • Solar Street Lighting System
  • Solar Water Pumping System
  • Solar Fencing
 more info @

Sunday, 22 September 2013

Major Plant, Equipment and facilities

Greentek having total production floor area of 80000 Sq Ft at various locations in India.

Greentek having automated manufacturing facility for Tanks fabrication and collectors.

Greentek have a strength of about 90 skilled & technically qualified work force with an installed capacity of 60 Lakh litres of Solar Water Heaters and 15 MW of Solar Modules per annum to support our growth plans.

more info @


Thursday, 19 September 2013

Quality Process

We are committed towards our clients by building long term, quality relationships and provide intelligent solutions to water quality issues through technical application assistance, and the sale of superior quality products.

We give utmost importance to quality and it is never taken as chance.

In maintaining the quality, we conduct stringent check at each level of manufacturing and assembling process.

We procure quality water processing machineries and customized it according the requirements of our clients.

Our quality check measures conforms to both Indian and international standards as per BIS (IS:12933) and ISO 9001-2000 quality standards.

The quality aspect is not confined to the products alone but it extends to the entire spectrum of our operations

more info @

Wednesday, 18 September 2013

Solar Thermal & Photovoltaic Working Together

Solar Thermal and PV should not be seen as competing technologies or products as they perform different functions and as shown below can be installed together to provide a well balanced solar energy harnessing system. Electricity can be used for almost any application, and so is a universal energy source. Heat is required for hot water and space heating which represent a large % of a household's total energy requirements.

A system that incorporates a solar thermal system with a modest sized PV system is a great option

more info @ 

Tuesday, 17 September 2013

ST (Solar Thermal)

Solar thermal panels are referred to by a number of different names such as Solar Water Heater,Solar Hot Water Panel, Solar Hot Water Collector,Solar Thermal Panel or Solar Thermal Collector.These terms all describe the same generic device.

Solar water heaters work by absorbing sunlight and converting it into usable heat. A simply analogy is to think about a dark coloured object sitting in the summer sun. Over time it can become very hot from absorbing the sunlight. Solar water heaters work in the same way but using materials that are specially designed to maximise the efficiency of that absorption. High quality absorber coatings, as used by Greentek products, are able to absorb up to 95% of the energy in sunlight throughout the full spectral range (PV only absorbs a portion of the spectrum). Below is an example of a quality absorber from coating manufacturer Tinox that absorbs 95% of available sunlight, and only radiates (emits) about 4% of the absorbed energy as heat. The key areas to look at are the yellow which represents solar radiation and the light blue which is how much of that sunlight is absorbed by the coating.

Solar water heaters, such as the evacuated tube solar collectors by Greentek that use evacuated tube technology, are able to reach a complete solar collector efficiency (not just the absorber)

Solar water heaters can therefore reach efficiencies that are consistently more than 4 times higher than PV panels.

more info @ 

Monday, 16 September 2013

PV (Photo-Voltaic)

PV converts sunlight into electricity using a semiconductor material (normally silicon). When like strikes the cell a portion is absorbed within the semiconductor material knocking electrons loose and allowing them to flow. This results in an electric current and thus electricity production. PV panels primarily absorb the visible portion of the light spectrum.

PV panels are normally connected to an inverter to convert from DC (Direct current) to AC (Alternating current) and subsequently the electricity is fed into the power grid.

The PV panels may also directly run devices with DC power such as solar powered calculators, or lights.   The DC electricity can also be stored in batteries

Commercially available PV panels are able to convert available sunlight into electricity with optimal conversion efficiency of around 15%, with some panels able to reach as high as 20%.

It is important to note that a panel rated at 200Watts will not consistently provide 200Watts of electricity throughout the day.  The 200Watt rating is based on maximum summer sun radiation level of 1000W/m2( 317.1Btu/ft2) in an ambient temperature of 25oC / 77oF. So on a clear summer day a 200Watt panel can be expected to provide around 0.7 - 0.8kWh of electrical energy

more info @