Electricity generated through coal plants is becoming expensive day by day. Power cuts and increasing dependence on DG sets is causing a lot of damage to the environment. The demand supply gap for electricity is increasing in the country which makes it very important for people to start thinking of other ways of realizing their energy needs.

India is faced with the challenge of sustaining its rapid economic growth while dealing with global threat of climate change. There are some observed changes in climate parameters in India too, like increase in surface temperature by 0.4 ˚C, variation in monsoon patterns, rise in sea levels by 1.06-1.75mm per year, extreme weather conditions breaking over 130 years records, Erratic water flow in perennial rivers originating from Himalayas. Alongside, the fast depleting conventional sources of power generation have worsened the situations of energy crisis.

Key Points –

  • Providing access to a minimal supply of clean energy – enough to power two LED lights for a few hours and charge a mobile phone – is probably not enough to significantly improve people's lives.
  • A study has revealed that homes that had received basic access to clean electricity for the first time, have spent less on expensive kerosene for lighting, a benefit to families and environment.
  • Access to a couple hours a day of electricity was not enough to boost savings, help launch new businesses, increase time spent working or studying, or otherwise significantly improve people's lives.
  • Requirements are larger clean power systems capable of providing enough energy to power businesses throughout the day.
  • Frustrations with the power supply are hardly limited to clean power users in India. Even 75 percent of families connected to grid power in rural areas – 700 million people – regularly get less than six hours of uninterrupted power a day.
  • More than 230 million people in India still have no access to basic electricity, often in rural areas where expanding the national power grid is too expensive.

Vision of Project GREEN SUN –

The vision is to ensure that solar energy is the leading contributor to India's energy system.

Mission of Project GREEN SUN –

The mission of project GREEN SUN is to accelerate the adoption of solar power technology across the country, to conserve our environment and provide a sustainable and conflict free power supply.

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Frequently Asked Questions

When you install a solar energy system on your property, you save money on your electricity bills and protect yourself against rising electricity rates in the future. Going solar is a smart investment regardless of where you live.

Solar power, like other renewable energy resources, has many environmental and health benefits. Going solar reduces greenhouse gas emissions, which contribute to climate change, and also results in fewer air pollutants like sulphur dioxide and particulate matter, which can cause health problems.

Solar PV cell is the basic building block of a PV system. It consists of semiconductor material that absorbs sunlight to generate electricity through a phenomenon called "photoelectric effect". A basic PV cell produces a very small amount of electricity and multiple of them are connected together to form a Solar PV module that can generate 10W to 300W output. If more electricity is required, then multiple PV modules have to be installed in an array.

Multiple kinds of materials are used to create a solar cell and the efficiency of solar cell depends on the same. The efficiency of a solar cell is defined as its capability to convert a certain amount of sunlight into electricity. Solar cells available in the market are of various efficiencies: 4%, 8%, 12%, 14% and 16%. The size of a Solar PV module required will depend on output and efficiencies.

The Roof Area required in Sq. Ft. Is as follows

PV Module
Efficiency (%)
PV Capacity Rating (Watts)
  100 250 500 1000 2000 4000 10,000
4 30 75 150 300 600 1,200 3,000
8 15 38 75 150 300 600 1,500
12 10 25 50 100 200 400 1,000
16 8 20 40 80 160 320 800

For example, to generate 2000 watts from a 12% efficient system, you need a 200 sq ft of roof area.

The connected load of your setup will help you determine the size of system that you need and that in turn will drive the cost of the system. Solar system is good for operation of low wattage appliances like fans, televisions, LED LIGHTS etc. Although a solar PV system can generate electricity through direct or scattered sunlight but it is very important to assess the amount of sunlight available at the location where a solar PV system is being installed. To collect maximum sunlight the ideal orientation of a Solar Panel is towards south. However a 45-degree east or west of south can also work. The system should be placed in such a place so that there is no obstruction.

The load carrying capacity of the roof where the solar panels are to be installed should also be done. Solar Panel structure typically weight 15kg per sq meter and the roof should be able to handle the load. Tilt at which the solar panel is installed is also an important consideration. It is important that the tilt of the solar panel is the same as the latitude of your location.

Wattage capacity of a solar PV system does not mean that the wattage will be available 24 hours a day and all throughout the year. The units or kWH output of a solar panel will depend on the panel efficiency and availability of sunlight in a location. The factor that defines this output is called CUF (or Capacity Utility Factor). For India, it is typically taken as 19% and the calculation of units goes as:

Units Generated Annually (in kWH) = System Size in Kw * CUF * 365 * 24

So typically a 1kW capacity solar system will generate 1600-1700 kWH of electricity per year

It's important to minimize shading because solar panels operate at optimal output when their entire surface is fully exposed to direct sunlight. The system will still produce energy if it is shaded but its output will lessen.

When you install solar panels on your property, you will still be connected to the grid. This allows you to draw from the grid when your system is not producing all of the power that you need. It is possible to go off the grid with a solar energy system that includes battery storage, but it will cost significantly more and is unnecessary for the majority of homeowners.

Solar systems are made of durable tempered glass and require little to no maintenance for the 25 to 35 years that they will generate power. In most cases, you don't even need to clean your solar panels regularly. If something does happen, most equipment manufacturers include warranties, although warranty terms depend on the company.

Solar panels are very durable and capable of withstanding snow, wind, and hail. The various components of your solar power system will need to be replaced at different times, but your system should continue to generate electricity for 25 to 35 years.

Power inverters convert the electricity that your panels produce from direct current (DC) to alternating current (AC) power. There are three types of inverters: string/centralized inverters, microinverters, and power optimizers.