Wind Power Equation
To predict how much power is available from the wind, you can use the equation below.
Power in watts = (collection area in sq. ft.) (Wind speed in MPH)3 (0.0054)
To illustrate how this equation works, imagine that you have a wind turbine with a diameter of 10 feet (area of 79 sq. ft) that is spinning in a steady 30 mph wind.
According to the equation above, if the generator were 100% efficient, it would produce about 11,500 watts of electricity.
Of course, perfect machine does not exists that can extract all of the available energy.
A more realistic efficiency figure is 30%.
So, using our example above, we could expect our generator, in a 30 mph wind to produce about 3,500 watts of electricity.
Now, if the wind were to increase to 60 mph, according to the equation, the power produced would increase by a factor of eight or 28,000 watts.