There are massive various variations in size but all home wind turbines have something in common
Every wind turbine system consists of a rotor (“blades”) which convert the wind’s energy into rotational shaft energy, a nacelle (“enclosure”) containing a drive train and a generator. The drive train may include a gear box. Supporting these two components is a tower, and the entire turbine also has electronic equipment associated with transferring electricity: controls, cables and so on.
While these are the principles underlying the construction of home wind generators, there are two basic designs of all turbines whether a collection of gigantic turbines (a “wind farm”) producing 5000 kW each or small home wind turbines producing just enough electricity sufficient for a home or business. These are the vertical axis or “egg beater” type and the horizontal axis or “propeller” type. Most of the utility scale turbines in the market today, producing 100 kW and more, are the horizontal type.
The horizontal type of wind turbine has a more comforting aspect to the casual observer because they can relate its rotor arrangement to the propellers on an aircraft or the rotors on old Dutch windmills. All that will be unfamiliar is the small number of blades – often only two. Not least because of its easy familiarity to ordinary folk, the horizontal type of turbine is the style used mainly for small home wind turbines.
The size of the horizontal turbine used most commonly for residential or small business use are larger than the DIY model mentioned above but much smaller than the largest commercial turbines, in fact minuscule by comparison.. Most home wind turbines are 10kW turbines with rotor diameters of 20 feet or less, mounted on towers of 100 feet height or less. They are not placed on rooftops but on the ground positioned for maximum wind exposure. Check this site for more details