ACS Distance Education UK
One of the advantages of wind power is that the wind may still blow even if the sun is covered by clouds. Developing a two-energy source system by using both solar energy and wind power is an excellent method for alternative energy self sustainability, however initial costs may be daunting.
Assuring the wind has the strength for the turbines is essential. Just because a site looks windy, it may not produce the necessary wind velocity to produce sufficient energy. Turbulent wind can negate benefits of a rotating propeller. Turbulence can be developed from nearby trees, buildings, etc. It is therefore important to ensure the proposed turbine site is above any "external" influence.
To ensure an even air flow in the area under scrutiny, place a ribbon on the end of a long pole and position this in the wind stream. If the ribbon flows strong and evenly, then this is a good indication of a good site.
Air speed is best measured by an anemometer.
Air speed increase with height due to no ground surface friction. At a height of 26 metres, the wind speed reportedly is about 50% more than at ground level, which can equate to about 300% increase in power at this height.
To charge a 12 volt battery, the wind generator must produce more than 12 volts to be of any affect. It is worth noting that voltage output of an alternator is directly proportional to its speed or RPM.
SOME FACTS ON WIND GENERATION
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