Wind Turbine Tower

Turbines are mounted on towers because wind speeds increase with height in flat terrain. Generally speaking, the higher the tower, the more power the wind system can produce. Air turbulence can exist closer to the ground and the tower raises the turbine above it. It is a good idea to install a wind turbine on a tower with the bottom of the rotor blades at least 30 feet above any obstacle that is within 300 feet of the tower. By investing relatively small sums on in increase in tower height you can yield very high rates of return in power production. For instance, you can raise a 10-kW generator from a 60-foot tower height to a 100-foot tower with a 10% increase in overall system cost, but it can produce 25% more power. There are two basic types of towers: self-supporting or free standing and tethered. Most home wind power systems use a tethered tower which are the least expensive option. They consist of a simple, inexpensive framework of metal strips supported by cables and earth anchors. However, because the cable radius must be one-half to three-quarters of the tower height, cabled towers require enough space to accommodate them. Cabled towers can be hinged at the base so that they can be lowered to the ground for maintenance and repairs, or during hazardous weather such as heavy storms. Self-supporting or lattice-work towers are a sturdy alternative though the initial cost will be greater. Towers built with aluminum don't hold up to heat and cold conditions as well and should be avoided.