One understands the direct change of the solar energy in a stream by Photovoltaik. For this, the solar cells in which the visible light causes a stream river by means of a chemical reaction are used. The technology is not new, already for over 50 years, solar cells are in use an application. In the beginning, just still enough for a pocket calculator, they drive in the universe even satellites with her gigantic solar leeches. Nevertheless, meanwhile the technology has matured far enough to be used also on the earth, really Each can allow mounting solar cells on the roof or in the back garden. With the rising energy efficiency devices can be driven more and more directly with the sun, for example, park note machines are supplied for some years independent of the stream net. In the end of 2014 possibly so much energy with solar cells was already moved that they could cover together about 1% of the annual stream need worldwide. In Germany, this number lies relatively high, namely with about 7%.
A long time were solar cells because of the high cost unpopular, however, with the Minaturisierung also there came the more attractive prices, so that they are affordable today for everybody. Not only the solar cells themselves but also other components which allow an entire substitute of the electricity supply have sunk in last decades on a fraction of her former costs. The biggest advantage of the Photovoltaic is obvious: The raw material is in stock not only indefinitely. On rainy days memory solutions have to go for a controlled company, however, here. These also lie even today above the costs of fossil fuels, however, one should still consider to change. It is to be supposed that fossil fuels become more and more expensive with the time. More still, the stream net becomes more and more intelligent and it could be already possible during the next 10-20 years to feed stream into the net – to sell to the energy supplier. Therefore a good use would be found even for the “excessive” energy.
As already mentioned and of course also known, the sun does not seem, nevertheless, the whole day and long ago also not on all days sunrays penetrate by the cloud cover. So there are two possible approaches: Either one uses the stream produced by the solar cells to come floating directly around only devices whose use hangs together directly with the weather condition. Or, however, one stores the won stream in batteries. For the first case uses as for example a ventilation system offer in summer. If it is hot, the sun also seems. The cover ventilating fan possibly will run always then when it is necessary. Vice versa it will not be so important in rain or at night that this runs. However, therefore the full need of an arrangement cannot be also covered. The other possibility is by far costlier but offers more far-reaching ranges of application. Island systems, as for example the park note machines, become first thereby possible. Nowadays thus it is to be supplied absolutely possibly a summer cottage with a memory arrangement mounted in the cellar. Then dark nights are illuminated possibly about the stored solar stream. By means of change judges conventional electrical appliances with the stored energy can be also supplied. With the Photovoltaic own small power station is possible already today. And various supports of countries and alliance make this still, in addition, attractive.