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Renewable energies: photovoltaic


Renewable energies
At the base of the production of renewable energies between sources, also called renewable, there may be the photovoltaic effect. It is a completely natural effect that occurs when solar radiation passes through a semiconductor material, such as the crystalline silicon of the solar cells of our photovoltaic panel. Alternatively, an alloy between cadmium and tellurium is also being studied.

Let's go back to silicon which on the basis of its crystalline structure is distinguished in monocrystalline or polycrystalline, if it has no structure it is amorphous silicon. L'photovoltaic effect then? The photon arrives from the sun, passes through a cell of the panel and breaks the bonds between the electrons of the silicon which, finding themselves free to move, migrate creating a positively charged and a negatively charged area. Between the two, in the single cell, an electric field is thus produced which creates other displacements giving rise to a voltage between the side of the panel exposed to the sun and the other.

How does all this affect our lives as terrestrials, far more giants than photons and particles? Connecting the two parts with wires to a light bulb, for example, turns on. It's possible convert solar radiation into electricity. Illuminating.

Renewable energies: photovoltaic systems

Photovoltaic systems for the production of renewable energies they exploit the effect just described to generate electric current which, transformed into alternating current, can power electrical appliances in homes, schools, companies, the world. Toaster included, if you are wondering with a little peckish.

In these plants there are small Photovoltaic cells in amorphous silicon, mono or polycrystalline, connected in series by surface silver strips. The more cells form a module, the more modules a plant. In theory a photovoltaic panel is a eco-sustainable system to generate electricity from solar radiation but does not always completely satisfy the energy needs. The renewable energies obtained from photovoltaic systems in general do not allow us to be able to give up the connection to the "classic" electricity grid that we have.

THE photovoltaic panels they can be, from the most expensive and profitable to decreasing, monocrystalline, polycrystalline or amorphous silicon, each situation must be evaluated to choose the best, there is no universal rule, a compromise must be sought that takes into account average consumption, available budget, place of installation of the plant and its exposure, climate.

The photovoltaic systems they provide continuous and constant energy during the hours of sunshine, which is fed into the grid of our electricity provider. Engage in calculations and evaluations on renewable energies and not, be careful not to confuse the KW / p with the KW which are the simple parameter of the electric user. The KW / p are instead the peak kilowatts and indicate the maximum power that the modules of a system can reach inabsorption of solar radiation.

Now that we know what photovoltaic systems, where do we install them? We have various possibilities including over the roof, with a frame, integrated into the roof, on the facade, mounted on the ground or on a terrace / balcony. Subject to bureaucracy, even a condominium can have its photovoltaic system for renewable energies, a condominium like a company and other buildings that "sunbathe".

Renewable energies: photovoltaic incentives

Having said that it is worthwhile install photovoltaics (click to understand and believe it), we see how the situation in the home is even more convincing when we store excess energy instead of giving it to the grid, and it is possible to do so with storage systems. Finished on Energy bill we have witnessed a die-off of photovoltaic panels of oversized whose excess production would have been wasted, to the advantage instead of a proliferation of micro-installations for residential use, with a logic of self-consumption.

This trend in the field of renewable energies should last thanks to indirect support measures such as 50% deductions for building renovations and energy saving. In the residential sector, the most widespread and most convenient photovoltaic systems at the moment, thanks to direct incentives and not, they are the ones able to store excess energy "on site", and then use it when needed. For example, during the day I accumulate it, in the evening I use it to take a nice hot shower. In this way, energy withdrawals from the grid are minimal, no waste.

The difficulty, the genius, the skill, the bet ... let's call it what we want but it is knowing how to correctly size thephotovoltaic system. With the evolution of storage systems it is hoped that once the return of the investment for the installation of residential photovoltaic systems becomes "human".

Who was among the first to believe in renewable energies by installing photovoltaic systems without storage, he will not be fooled unless he has one of those up to 20 kW in exchange mode on the spot that access the incentives contained in the interministerial decrees of 28 July 2005 and 6 February 2006 (incompatible with the installation of the modules storage).

For all the other visionary owners of photovoltaic systems the Energy Services Manager (Gse) allows you to install the storage modules on plants already incentivized and / or benefiting from the minimum guaranteed prices.

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