Common mistakes to avoid in your small wind project

A large fraction of small wind projects turn out to be subpar financial investments because of simple mistakes made in the initial phases of project development. This entry focuses on those common mistakes and provides simple steps that can be taken to ensure a more viable project from the performance and financial perspectives. For more details see the associated whitepaper.

Small turbines, with power ratings of less than 100KW, are being installed at a rapid pace. These wind projects are being used to power small businesses, buildings, malls, houses and a variety of other applications. Unlike the multi-million dollar large scale projects that undergo rigorous wind resource, siting, and financial assessments, small wind projects undergo significantly less analysis and preparation. The end result generally reflects the lack of preparation, as turbines produce less energy than advertised.

In order to attain on par financial performance of small wind projects the following due diligence must be performed:

• Ensure that the energy production used in the calculation is based on your local wind conditions and based on independently tested or certified power curve.
  
• Ensure that the wind speeds used in the calculations have been verified through onsite measurement or some other means.
  
• A location has been chosen that will receive unobstructed wind and minimum turbulence from obstacles and local vegetation.
  
• Ensure that the turbine is well built and is suitable for your environment and,
  
• Check if the turbine is certified; if it is not, obtain test results
  

If the proper due diligence is not performed you are likely to be negatively surprised by the results.

Article written by Dr. Pramod Jain

Email Pramod at pramod@frombeginningtowind.com

Visit Wind Energy Consulting and Contracting Inc.

Truth in Rated Capacity and Power Curve of Turbines

Among the challenges in piecing together a wind project is the selection of a wind turbine. Several factors are used to determine the appropriate wind turbine for each project. Primary among these is using the manufacturer's rated capacity to estimate energy production.

Some turbine manufacturers claim higher turbine name-plate capacity and therefore higher energy production than what a customer will realize. We have observed this most frequently in smaller vertical axis wind turbines (VAWT) and less frequently in horizontal axis wind turbines (HAWT). This is a particular problem if power ratings and power curves are not certified by an independent agency. I have written a whitepaper that will describe a quick method to verify, at a theoretical level, if a turbine's actual production will ever measure up to the claim. The analysis in the whitepaper and rules of thumb can be easily applied to assist you in evaluating a wind turbine for your project. A 'back-of-the-envelope' check, of both the rated capacity as stated by the manufacturer and the power curve supplied by the manufacturer, can prevent you from choosing a turbine that will not perform as advertised because, after all, the energy production cannot defy the laws of physics.

Article written by Dr. Pramod Jain

Email Pramod at pramod@frombeginningtowind.com

Visit Wind Energy Consulting and Contracting Inc.