|Thereís a lot of mis-information on the net surrounding the output of a wind turbine. A great many scam artists are over rating their turbines to make it sound like you can get a lot more power than you really will. Even commercial manufacturers tend to over rate their turbines, by using wind speeds that are not commonly seen at John Q. Publicís homestead. We have put together an online calculator that will help you sift the wheat from the chaff so to speak. Plug in your numbers and see what you can expect from a given wind turbine at your location.
A weather station is recommended in order to track Wind Speed, Temperature, Humidity, and Barometric Pressure. These are the four variables that you will need for the following calculations.You can learn to build one at http://arduinotronics.blogspot.com.
Another good reference is Alton's Propeller Carving And Power Calculator