About StealthGen

The StealthGen Wind Generator is a new direct-drive wind generator, designed for a variety of microgeneration applications. It is exceptionally quiet and vibration-free in operation, qualities that are of paramount importance for any wind generator operating in close proximity to people. The StealthGen features a powerful 3-phase alternator, and computer-designed rotor blades optimised for low speed, user-friendly operation.

This innovative machine is extremely efficient in low wind speeds, yet is capable of sustained power outputs of over 500 watts in higher winds.

It is small and light enough to be easily attached to most building structures. Given average wind speeds at the site of around 12 mph, one D400 StealthGen could realistically provide 15 – 20% of the average home’s annual electricity requirement.

Inexpensive to purchase and virtually silent in operation, once installed the StealthGen is no more conspicuous than a satellite dish.

Distinctive and elegant in design, the StealthGen is superbly engineered for long, trouble-free service, and is available in 12, 24, 48,72  or 150 volt grid-connect variant.

Due to the StealthGen’s low cost, it is perfectly feasible to install several machines.

Environmental:

Small wind turbines sited within the urban environment have the potential to make a significant contribution to the attainment of fuel poverty and carbon abatement targets.

Eclectic Energy Limited has worked closely with INREB Faraday, the NGO tasked with the development of these technologies.

Conventional wisdom has largely precluded the mounting of wind generators on buildings due to the unacceptable noise and vibration associated with such installations. Eclectic and its research partners have overcome these problems in the development of the D400 and StealthGen technology.

The power produced can be used for:

Grid connect – G83 inverter technology

Battery inverter AC systems

DC direct supply to fluorescent lighting

DC supply water heating

Battery charging (transport)

Hybrid ground source heat pump systems

Hybrid micro wind/ photovoltaic systems

Power
produced
CO2
Abatement
1 x D4001 Year660 kW hrs.0.27 tonnes
25 year Lifespan16,500 kW hrs.6.75 tonnes
1000 x D400s1 Year660 MW hrs.270 tonnes
25 year Lifespan16,500 MW hrs.6,750 tonnes
1,000,000 x D400s1 Year660,000 MW hrs.270,000 tonnes
25 year Lifespan16,500,000 MW hrs6,750,000 tonnes
Specifications

StealthGen Wind Turbine Specifications

Performance

Rated power235 W @ 11 m/s (22 knots), 420 W @ 14 m/s (28 knots)

Power outputs

Maximum power600 + W
 Rotational speed1100 rpm @ 14 m/s
 Cut-in speed2.5 m/s (5 knots)
 Cut-out wind speedNone

Turbine features

Turbine typeHorizontal axis upwind
 Number of blades5
 Airfoil typeLow Reynolds – variable camber
 Diameter of turbine1.1 m
 Swept area0.95 sq. m
 Tip speed ratio4
 Typical noise level2 – 6 dbA over background
 Blade materialGlass-filled nylon

Alternator

Alternator typeDirect drive – axial field
features12 pole permanent magnet generator
 Design3-phase AC with rectification
 Outputs direct current (DC)
 Annular high energy magnet rotors
 Encapsulated stator windings
 Voltages availableDC: 12 V, 24 V, 48 V, 72 V
 AC: 240 V grid connect via inverter
 MaterialsAluminium alloy housing, hermetically sealed
 Alocrom 1200 corrosion protection and polyester powder coat
 316 stainless steel shafts and A4 stainless fasteners
 EMI (electromagnetic emissions)C.E. compliant
 MCS AccreditationPending
 Control systemStall regulation
 Brake systemElectromagnetic braking switch

Yaw system

PassiveLow resonance, formed aluminium tail
 Heavy duty slip ring assembly with saddle spring loaded output brushes
 Turning circle700 mm

Mounting

Typical stub tower50 mm – 75 mm O/D

Weight

Total17 kg

Finish

Colours availableWhite with white blades
 Black with translucent blades
Installation

StealthGenBuilding Mounting:

Eclectic StealthGen turbines can be successfully mounted off structural walls (typically the gable wall) using the specially designed bracketry illustrated. Drawing A (and photograph Aa) shows a typical standard duty installation, secured by 4 x M10 masonry anchors, and provides for a maximum free tower length of 2.5 metres. Refer to ‘Standard Bracket Installation’ section.

Where a greater free tower length is required, i.e. up to 4.5 metres, the heavy duty bracket system (see photograph B) should be used. These brackets are secured with 8 x M12 masonry anchors, and can accommodate towers up to 75mm diameter.

The masonry anchors used should be of the pumped resin grout type, and fixings should be subject to a proof load test prior to the bracket installation (photograph ‘C ‘). This testing demonstrates that fixings and masonry are sufficiently strong to absorb the loading produced by the turbine.

Note, any StealthGen mounting tower should be designed to provide a safe working load of 70 kg in a lateral direction at the hub height of the turbine.


Building Mounting
:

StealthGenStealthGenEclectic StealthGen turbines can be successfully mounted off structural walls (typically the gable wall) using the specially designed

bracketry illustrated. Drawing A (and photograph Aa) shows a typical standard duty installation, secured by 4 x M10 masonry anchors, and provides for a maximum free tower length of 2.5 metres. Refer to ‘Standard Bracket Installation’ section.

Where a greater free tower length is required, i.e. up to 4.5 metres, the heavy duty bracket system (see photograph B) should be used. These brackets are secured with 8 x M12 masonry anchors, and can accommodate towers up to 75mm diameter.

The masonry anchors used should be of the pumped resin grout type, and fixings should be subject to a proof load test prior to the bracket installation (photograph ‘C ‘). This testing demonstrates that fixings and masonry are sufficiently strong to absorb the loading produced by the turbine.

StealthGenNote, any StealthGen mounting tower should be designed to provide a safe working load of 70 kg in a lateral direction at the hub height of the turbine.

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