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Private wind turbines for decentralized power supply

17. May 2013

Small wind turbines as an option for private electricity generation are often neglected in the public discussion on power generation. However, many households are striving for a self-sufficient energy supply with renewable energies. However, with photovoltaic systems and batteries for storing solar energy in low-sunshine autumn and winter, one will not get far if one strives for high self-sufficiency with renewable energies. Small wind power plants then contribute to the supply of electricity when the solar power system largely fails because of a lack of radiation energy. All in all, a small wind turbine will streamline electricity production on a daily and seasonal basis. This also has a positive effect on the dimensioning of the battery. A smaller current memory can be selected.

Small wind turbines have high location requirements

While multimegawatt wind turbines are installed in airy heights, the wind conditions for small wind turbines are much poorer. The wind moves parallel to the earth's surface and is strongly braked, especially near the ground. The free position of the small wind wheel is of crucial importance. The wind should be able to flow freely from the prevailing wind direction several hundred meters free on the rotor. Obstacles interfere with the uniform wind flow and whirl the wind. This will markedly reduce the return on private wind farms. If you are considering the purchase of a small wind turbine, you should critically check the wind conditions of your own garden. The mean annual wind speed can be determined with an anemometer. From the mean wind speed it is possible to conclude the expected power yields of small wind turbines.

Building authorities and neighbors must play along

Good low-wind sites with a free location are often characterized by the fact that the next neighbor is not in the immediate vicinity of the wind generator. Anyone who is more than 100 meters away from the rotor will not hear it and often will not see it. In any case one should contact the neighbors and talk about the planned wind turbine. If the neighbors are opposed, it becomes difficult with the implementation.

In many states, small wind turbines with a height of 10 meters can be erected without a building permit. But this bureaucratic relief is of no use even if there is hardly any wind at this altitude. The higher the rotor of the small wind turbine, the more wind. Therefore it often makes sense to erect a mast from 20 meters. This requires a building permit, but is rewarded with significantly higher power yields. Here, too, the wind and yield potential can only be determined on site with a wind measurement.

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