There is all size wind turbines, can be tens watt up to several megawatts for the biggers. For small wind turbines, the power of the engine show the wind turbine can produce this power for the wind speed indicated by the manufacturer. Today, the price of a wind power watt is more expensive that the price of a solar panel watt. But these two powers are additional and the best installations are composed with both.
If the power of a wind turbine is 500W, that means it will produce 500W with a called nominal wind speed.
The wind speed is a very important factor. Ask to your supplier how fast wind his wind turbine will produce 500W and compare it with the wind speed average of the place you live.
This question is often asked by hotelier worried about the comfort of their guest.
Like every object in fast moving, blades can cause a hissing more or less acute or deaf (by size). But in the small wind turbine up to 20kWh, we can observe that the sound will be widely covered by the noise of the wind in the trees or by the hum of your generator.
There are many choices of technologies with their advantages and disadvantages. First, you must verify with the supplier if your place's wind is neough to obtain a good production. If you are in region with a wind average about 5 or 7 meters per second, it is better to choose a wind turbine without mechanical reduction gear and with a permanent magnet generator.
There are wind turbines over 60 years, this is possible with a regular maintenance. However, the most of occidental manufacturers display lives of at least 10 years. You must consider the environment conditions and the maintenance which will be making on the wind power. Most of the time, you will must do lubrification, paint, watch for cable, mast and connection periodically. And a special attention to your batteries will be important.
Madagascar is one of the ten first African countries in terms of wind resource. It is important to operate this potential. The most windy region are the north and the extreme south, there is some speed wind more than 40 km/h at 25m height.
We can find excellent thermals on the coasts. In the land, some interesting wind can exist depending on the relied, the altitude, etc... Be careful, a wind turbine can produce power only if you can exploit enough wind, you must take care about your area before implement a machine.
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