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Sizing and Pricing for Wind Turbine Systems

Dovetail Solar and Wind offers complete wind power systems with a range of options. We currently feature Xzeres, Evance, Kestrel, Proven and Southwest Windpower wind turbines. These are the best machines we have found for the low to moderate wind speeds that are commonly found throughout Ohio and the surrounding states.

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Wind Turbine Sizing

A typical home uses approximately 9,400 kilowatt-hours (kWh) of electricity per year (about 780 kWh per month). Depending upon the average wind speed in the area, a wind turbine rated in the range of 2.4 to 10 kilowatts is typically required to produce a significant portion of this demand. The installed price for these types of systems, including all electronics, foundation, tower, disconnects, etc. are in the $25,000 to $65,000 range. A typical $40,000 wind turbine can lower your electricity bill by 60 to 90 percent.

Selecting the correct tower size can make a big difference in energy production. In general, towers should be installed so that the machine is 30 feet above all obstacles surrounding it, within a 300 foot radius. This is to ensure that the air is free of turbulence. It will make the wind generator run more smoothly and create less stress on its parts. Another consideration for selecting tower height is that, the higher the tower, the faster and more consistent the wind speed. So, if you are unsure about how high you need to go, taller is generally better.

There are three primary types of towers. From lowest to highest cost they are: guyed lattice, freestanding lattice, and free standing mono-pole. Our lattice towers are typically made of galvanized steel tubing lattice mounted on a large, steel re-enforced concrete footing. They can be either free-standing or guyed with steel cables in four directions and anchored in concrete for outstanding durability. Tilt-up towers can be sometimes be used on for smaller turbines. They allow you to perform routine maintenance with ease using simple hand tools and a truck/tractor.

Free-standing towers are also available for all machines. Although these tower types may initially be more expensive they are easier to install and maintain. Furthermore, the free-standing towers are more aesthetically pleasing, and require less land area or footprint. Our experience leans toward the monopole tower design over all others.

Since a properly designed wind system requires careful consideration of many site and component characteristics, please contact us to obtain more specific pricing for a system to meet your needs.

When available, State grants and Federal tax incentives can offset a significant portion of a residential wind system’s cost. For commercial and farm systems, the offset can be much larger due to the Federal tax incentives. This can be as much as 70% of the system cost see the below presentation for details and examples of each type of system.

Xzeres ARE Turbines

For residential applications with modest electrical loads or budgets, or for homes that plan to utilize both and wind and solar PV in a hybrid system, we offer a 2.4 kW turbine called the Skystream from Southwest Windpower. The installed cost of a Skystream wind system is approximately $17,000 to $23,000, depending on the site, and the type and height of tower.

Another good residential turbine manufacturer is Kestrel. Manufactured in South Africa, Kestrel offers some of the highest quality turbines in the world. Kestrel turbines are quiet, powerful, and robust machines. Units are available in 600 watt, 800 watt, 1000 watt and 3000 watt sizes. All are marine grade with variable pitch blades (except for the 600 watt machine).

For home owners, farmers or small businesses that wish to obtain a larger energy production, an excellent turbine is the Evance Iskra 9000. This 5 kW turbine is one of the most sought after small wind turbine available. Being the "next generation" of small wind turbines, it fully integrates the very best of existing technologies with major new patented innovations. The result is an attractive turbine with uncompromising performance and excellent reliability. It features one of the lowest wind cut-in speeds of only 5.6 mph (2.4 m/s). At higher wind speeds, when the energy in the wind exceeds the maximum capacity of the generator, the R9000’s unique Reactive PitchTM mechanism automatically pitches the blades. This regulates energy capture, rotor speed, and the loads experienced by the turbine structure. It will therefore capture the full 5kW power, and the reduction in stresses mean that the R9000 offers greater safety and survivability. A particular unique feature of Reactive PitchTM is that rotor speed (and thus structural loads) are automatically regulated, whatever the wind or generator conditions, including grid failure.

Click here for information about wind energy tax credits, grants, and Incentives

Give us a call to discuss your specific situation. Ohioans can check the State of Ohio web site: Ohio Dept. of Development's Office of Energy Efficiency (ODOD, OEE) for details on any renewable energy grants that may become available for small to mid-size wind turbines. No Ohio grants are currently available.

See our Frequently Asked Questions (FAQ) section for more information. Or see Get Started to understand the next step. Also feel free to call or , if you have other concerns.
 

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