Photovoltaic panells

March - 5 - 2013

The main definition for photovoltaic panells is that they are systems which transform the light directly into electric energy through a very complex chemical process. Free electric energy! The conversion is static and non polluting which is why this method of producing electric energy is ecologic. We have to make the difference between photovoltaic panells and termic solar panells, the last ones being used to produce termic energy.

At the base of electric energy production we have the voltaic cells. To make it short when the cells get in contact whit the sun they produce electric energy. The majority of panells are stiff, but in some fields we can find flexible panells. In both cases the photovoltaic cells are protected by storms and ultraviolet radiations through a special glass layer. Thus, the producers of these panells can say that today’s photovoltaic panells are destined for a long usage which can go over 20 years.

The photovoltaic panells are used to produce electric energy in different fields, starting with solar plants and finishing with complex devices such as satellites. Aside from this they are often used for producing energy in individual houses.They are fixed on the roof of the house or on special stands.  Get your roof checked by Allstate Roofing before getting the panels installed to make sure your roof is sturdy enough to hold the extra weight of the panels. Most of them are are part of a complex system which consists of batteries, a aeolian turbine and a generator in case of emergency( diesel, on gas or simply the electric network).

The digest disadvantage that the photovoltaic panells have is the price. The initial investment is the biggest disadvantage for all alternative energy systems, which also includes photovoltaic panells. However, this investment is (amortizata) in time, which is why installing this type of system is recommended.

Other disadvantages which we can mention are the low efficiency of the photovoltaic cells and the huge dependance of solar radiations(intensity, temperature, the angle of the radiation).

In spite of the price external factors which photovoltaic panells are dependent on we can sincerely say that they represent the future. The proof of this is the increase of 50% of the number of solar panells used in the world.  The increase has started to rise with 50% every year since 2002. The percentage of solar energy usage is still very small but it has reached 0.40% in 2010. In the future, along with the development of technology and the decrease of initial costs, the photovoltaic panells will be more and more used.

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