MW-2200 tm

Technical Summary

·  Productivity:  2200 kWh/month in a 13 mph average wind, on a house with a UDA factor of 1.9.  (See below for a discussion on UDA).

·  Name Plate: Median 10 kW rated output in 28 mph wind at sea level with 80% relative humidity on a roof with a UDA factor of 1.9.

·  Weight: 800 - 1000 pounds depending on sails selected.

·  Height: 8-12 feet depending on sails selected.

·  Diameter: 10-14 feet depending on sails selected.

·  Sail Sizes.  

·        Small Sail  9’8” X 10’2”

·        Large Sail 12’6” X 14’

·        Hawaii Sail 8’ X 14’

·  Cut-In Speed: Less than 5 mph, on a roof with a UDA factor of 1.9.

·  Top Speed: Maximum rated speed 120 mph at turbine.

·  Temperature:

·        Turbine Operating Temp. -45˚ F to 130˚ F.

·        Inverter Operating Temp. 32˚ F to 113˚ F.

·  Hook-up :

·        Small FRP enclosure/J-box (6”X6”X4”) that fits under the roof modification, and to which conduit can be channelled for the down-wiring.

·        Output Wiring is 14-4 wiring from the turbine to the inverter. 

·  Electrical : From Turbine

·        Voltage 0-480 volts

·        Amperage 0-10 Amps

·        Wattage max depends on number of coil packs selected. Calculated with sail size.

·  Electrical : From Inverter

·        MEDCOM/CPE_ AC/AC converters modules with grid connection each rated at 10 kW.

·        Installed in a wall-mounted enclosure for 10 kW wind system with output voltage from permanent magnets, 3-phase axial flux alternator.

·        Converter specification:

·        Wal-Mounted

·        Sine wave grid connected inverter with up to 50% overload capacity

·        Inverter Output Voltage: Single phase, 208 Vac, +10% / -15%, 240 Vac, +10% / -15% and 220 Vac, +10% / -15%

·        Rated Frequency: 50 Hz. +0.5Hz and 60 Hz, +0.6Hz

·        Rated Output Power: 10 kW

·        Rated Output current harmonics: <4%

·        Anti-islanding contactor between inverter and electrical grid

·        AC/DC and DC/AC conversion efficiency between 90% and 95%

·        Power Factor: Unity P.F.

·        Ambient temperature: 0º to 45º C

·        Auto reconnect (restart) after power interruption.

·        Includes dumpload resistors

·        Includes DC terminals for connection to optional DC/DC converters and batteries (if required).  Note: Batteries & Optional DC/DC converters not included in price.

·        Approvals: UL, CE. Meets UL1741 & IEEE1547.

·        Equipment manufactured in ISO facility.

·  Maintenance and Operation Costs: Minimal

·  Cost: MSRP $55,500 plus installation, for base model with base model inverter.

·  Deployment: Rooftop Urban or Rural Setting.

·  Total Estimated Production Run 2008: 400 Units

·  Warranty:  3-year limited warranty, details available on request.

·  Production units ready for delivery 4^th Quarter 2008.  First 60 will be shipped in October 2008.

Technical Research

The inventors spent two years studying the documentation from the US Department of Energy’s Sandia National Laboratory research into the challenges of Vertical Axis Wind Turbines (VAWTs).  They realized that if the following problems were overcome then they could build a workable VAWT – as described in a separate document.  Sandia’s list of previous VAWT problems included these:

In addition to the problems of the vertical-axis configuration, there were specific issues that the inventors had to address for a roof-mounted wind turbine to be viable.   They spent some years discovering and solving the problems of roof-top generating, which are:

VAWT Considerations

The amount of power that can be obtained from the wind turbine is dependant on three factors:

1. The amount of wind available.
2. The shape of the roof (roof effect).
3. The size of the sails.

 The shape of the roof is very important because the Mag-Wind™ MVAWT is mounted on the roof of a building instead of on a pole as are most other types of wind turbines.

 The shape of the roof is a major consideration because it can amplify the wind speed or detract from it.  Delft University coined an excellent term for describing this, the UDA factor.  This is the wind speed on the roof versus the undisturbed air (UDA). In our survey of houses the best UDA factor that we saw was a house with a 3.5 UDA factor.  In the wind speed density formula (WPD=1/2*P*V³) the velocity is cubed.  So a 3.5 times increase in velocity is a remarkable 43% increase in wind power available.  However most of the time we find that the UDA for houses with peaked roofs is between 1.5 to 2.5.

A good roof shape or an increase in the wind turbine’s sail area can make up for poor wind conditions in most cases.   However if we increase the amount of sail area to account for low wind speed then we also have to increase the number of magnets and coils that we use in our axial flux alternator for generating electricity.

 Because we have these three variables to consider when placing a turbine on a roof, it is impossible to show a conventional wind power curve chart.  The power curve is dependent upon how much wind is available at the site (including daily and seasonal variations); the shape of the roof of a specific building; and the size of the sails on a specific model of Mag-Wind™ brand MVAWT wind turbine.

Pricing

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Last modified: 06/10/08