All of the following is excerpted from Windterra press and website material. Key points to remember for this residential wind turbine are: much less expensive than solar install for similar output; very low visual profile; house needs professional assessment for structural integrity/sound damping. We strongly suggest you view the linked video and show it to the neighbors before you go for one. And finally, make sure you're up to laddering up the roof for an occasional oiling or can hire someone for occasional maintenance.
Advantages as outlined on the Windterra website are as follows:
Want to save on your electric bill with alternative energy but can't spring for a solar roof? The answer is blowing in the wind, at least according to Windterra, a Canadian wind turbine manufacturer that hopes to enter the California market via the East Bay...
Windterra turbines are vertical axis turbines (VATs) that have a boxy, low profile look, with three small blades perched on a short platform [pictured].
"Most people who pay about $200 a month for electricity can expect to save between $50 and $75 per month with a Windterra turbine," said Gayle Larson, director of market development for the company...
Solar roofs cost about 20,000 for a typical two-bedroom California home. Windterra turbines cost $5,900, with the cost of installation about $1,000...
"Yes, it needs to have an architect check for the structural integrity of the roof. The unit is 250 pounds or so," said Yanni Kalajakis, a marketer in Windterra's San Ramon office.
* VAWTs are omni-directional (can instantaneously accept wind from any direction) as opposed to Horizontal Axis Wind Turbines (HAWTs) which have to constantly rotate so that they are facing the wind.
* VAWTs are easily roof mountable and are less affected by turbulent air than HAWTs, which make VAWTs far better suited for residential areas where obstacles such as other houses and trees may disturb the airflow. Mounting the VAWT on a roof as opposed to a pole or tower makes the unit more accessible for easy routine maintenance.
* Windterra's VAWTs rotate at a much lower speed than the very high speeds of existing HAWTs (225 rpm versus 900 rpm), resulting in much lower noise levels and vibration.
* Windterra’s inverter technology provide efficiencies at lower voltages (lower wind speeds) not seen anywhere in the industry.
* Windterra's control system allow the turbine to operate at its most efficient level throughout the wind velocity range (Dynamic Loading). This ensures that the turbine is always producing the most energy possible for a given wind speed without overloading the turbine.
* Our blade design optimizes the turbine’s performance at typical lower wind speeds. Most designs concentrate on rated wind speed and rated power, which yield a lower annual power output at typical wind speeds. Windterra’s designs focus on generating the most amount of power at typical wind speeds. The result is a higher annual power output - this is what is important to the consumer - annual power output, not rated power!
* Windterra ships an all in one, complete system; everything you need to mount the personal wind turbine to residence or commercial building comes in one package!
* Windterra’s ECO1200 is a complete "all-in-one" wind turbine system, which includes the turbine, controller/inverter, and mounting system.
See promotional video with the turbine in motion here.
Via::Contra Costa Times, "Wind turbine manufacturer pitches alternative to solar roof"