Tuesday, 26 November 2013

Intro for Solar Energy



Solar energy is what that runs the entire life on earth,Each living things which are dependent on other living ones but the source of power for all comes from the one which is nothing but "THE SUN".
Even our humans harnessing sun rays from the past,The period from 18th century would be the gift for solar energy development and the discovery.

Scientists thought that it would become a big source for the future,Thus they found "Photo voltaic Cells" Which will convert suns light into electricity






Solar energy is the most readily available source of energy. It does not belong to anybody and is, therefore, free. It is also the most important of the non-conventional sources of energy because it is non-polluting and, therefore, helps in lessening the greenhouse effect.

Solar energy has been used since prehistoric times, but in a most primitive manner. Before 1970, some research and development was carried out in a few countries to exploit solar energy more efficiently, but most of this work remained mainly academic. After the dramatic rise in oil prices in the 1970s, several countries began to formulate extensive research and development programmes to exploit solar energy.

When we hang out our clothes to dry in the sun, we use the energy of the sun. In the same way, solar panels absorb the energy of the sun to provide heat for cooking and for heating water. Such systems are available in the market and are being used in homes and factories.

In the next few years it is expected that millions of households in the world will be using solar energy as the trends in USA,Germany,China,Russia and Japan etc, show. 
Solar energy can also be used to meet our electricity requirements. Through Solar Photovoltaic (SPV) cells, solar radiation gets converted into DC electricity directly. This electricity can either be used as it is or can be stored in the battery. This stored electrical energy then can be used at night. SPV can be used for a number of applications such as:

a. domestic lighting 
b. street lighting 
c. village electrification 
d. water pumping 
e. desalination of salty water 
f. powering of remote telecommunication repeater stations and 
g. railway signals.
The first solar cells which was discovered can able to produce not even 1%efficiency,After all the R&D developments over years now we achieved a good efficiency of 25.This is what the success of solar power which drives the Germany(Germany is the world's top PV installer, with a solar PV capacity of 35.082 GW(giga watts) at the end of September 2013.The German new solar PV installations increased by about 7.6 GW in 2012, and solar PV provided 18 TWh (billion kilowatt hours) of electricity in 2011, about 3% of total electricity.Some market analysts expect this could reach 25 percent by 2050.Germany has a goal of producing 35% of electricity from renewable sources by 2020 and 100% by 2050.