A tall tower is the single most important factor in the economic viability of a small wind system. Tall towers enable turbines to access faster in better quality winds, and even small increases in wind speed translate to exponentially more energy the turbine can generate. In other words, a taller tower means far more – and cheaper – energy.
Wind speeds increase with height
The best sites for turbines are those where the wind is least obstructed, which is often the highest point on a property. The bottom of the turbine rotor should clear the highest wind obstacle (rooftop, mature tree, etc.) within a 500 foot radius by at least 30 feet. Doing so ensures the turbine reaches consistent, fast wind speeds and prolongs the life of the turbine by avoiding stressful air turbulence.
Overly conservative zoning height restrictions therefore cost the owner money – and a lot of it. They can also mean more sound, since taller towers raise the generator high above the ground, diluting sound considerably. Sound decreases four-fold with every doubling of distance from the turbine (including distance above the ground) so taller towers are better for their owners as well as neighbors.
For zoning officials, the importance of strong winds also means that tower height cannot be compromised as a gesture to neighbors concerned about the visibility of the turbine. “Hiding” a turbine from neighbors using a shorter tower almost always means hiding it from the wind, too.
Nor do two shorter installations make an acceptable substitute for a single, taller one. A tower alone can comprise 50% or more of a system’s total cost, so multiple, shorter turbines (on multiple towers) cost the owner far more than a single, taller system.
Always be sure to install your wind turbine at least 30′ higher than the nearest obstructions.
It is also important to keep in mind that a turbine’s generator size (generating capacity, measured in kilowatts or kW) has little, if anything, to do with its tower height. Sometimes zoning regulations mistakenly limit tower heights based on the size of the turbine’s capacity, thinking that a 2kW turbine, for example, always corresponds to a 40 foot tower. This is not the case. Appropriate tower height is matched to a turbine depending on surrounding terrain, trees and buildings, and wind resource. Therefore, tower height restrictions, if any, should only reflect sound and safety concerns rather than be designed to correspond to a system’s generating capacity. Most often, in fact, established sound and setback requirements negate the need even to mention height in regulations for small wind systems.
Filed Under: Construction, Projects
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Hello I am wanting to put a vertical wind turbine 12000 watts into our solar panel system. This just makes so much more sense that when the sun is not shining the wind is blowing . We have a buy back system now. We are in West Central Florida north of Tampa , in the Spring Hill and Brooksville area. We do have sea breeze all most ever day in the afternoon . The Question is what size pole would i need for a 30 to 35 foot pole with a anchor to allow it to be lowered if need be for repairs or maintenance.. Question 2..and a estimate on how much power would I gain. I know that there is more to it with how long and how much and how fast but just need some advice .. Not looking to have one system take over but just for the 2 to work together..Recap.. how big and type of pole would need with guide wires? And how much power would a vertical 12000 watt wind turbine produce with average wind speed? Thank you Mike Blaha
Hello My name is Mike and I am wanting to put a vertical 12000 watt wind turbine into our solar power panel system . It just makes sense that when the sun is not shining the wind is Blowing. We have a buy back system now. We are in west central Florida. north of Tampa FL. Near the Spring Hill and Brooksville area . The question is would a vertical turbine on a 40 ft. pole work and how much would i gain in power feed back to the grid. I know there is a lot more to it , but just need some advice. Not looking to have one system over take the other just for the two to work together. How big around of a pole and do you need guide wires?