The D400 Wind Generator
Designed to be attached to
your house, outbuilding or boat.
Given average wind speeds at the site of around 12
one D400 / StealthGen could realistically provide 15 - 20% of the
average home’s annual electricity requirement.
The D400 /
Stealthgen is a
400 WATT direct-drive wind generator,
designed for a variety of marine, rooftop or terrestrial 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 D400 is available in white, or low
visibility black as the Stealthgen.
Conventional wisdom has
largely precluded the mounting of wind generators on buildings due to
the unacceptable noise and vibration associated with such
installations. The D400 Stealthgen overcomes these problems.
It is small and
light enough to be easily attached to most building structures.
The D400 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
high power outputs of up to 500 watts in higher winds.
connect – the Stealthgen's output is connected to your ring main
via a G83 inverter which produces 240 volts AC @ 50Hz synchronized to
the grid. When the Stealthgen's power is not required in the house,
the surplus flows back out to the local grid. You will need an export
electricity meter and tariff agreement with the power supplier if the
value of your exported energy is to be credited. Note that
grid-tied inverters are designed to be switched off in the event of
turbine grid tie installations you can either use a 72V turbine
together with an SMA WB700 inverter or a 48V turbine with a
Mastervolt Windmaster 500 inverter (the inverter efficiency level of
the system is 75% in real world conditions)
turbine control box / G83 interface has several functions - a) it
contains a voltage limiting circuit which prevents over-voltage
conditions at the inverter input. This can occur during the three
minute mandatory grid monitoring period following a grid failure and
re-connection (G83 requirement). b) it contains a DC isolator switch
(required under G83). This is of a 'no volts' type which trips out
when the grid fails. The system cannot be reset until grid power is
restored. This switch also operates a relay which brakes the turbine
when grid power is lost. c) it contains a brake switch which allows
the turbine to be stopped without taking the inverter off line.
NOTE : the conventional Landis &
Gyre type meters will not accurately record AC outputs. They typically
under-read by a factor of 3 to 4. High sample rate meters are
typical equipment list for the grid tie D400 turbine is:
D400 for grid connection (72V or
48V) = £1020.00 ex VAT = £1224.00
control unit for grid connection (G83 Interface) = £580.00 inc
Wall Bracket = £275.00 inc VAT.
Windmaster 500 grid tie inverter option is £565.00 inc VAT.
Windy Boy inverter option : please ask for details.
Single MC4 Plug for the Windmaster 500 inverter =
£6.20 each inc VAT.
Single MC4 Socket for the Windmaster 500 inverter =
£6.00 each inc VAT.
6mm Radox double insulated DC cable = £4.39/metre inc VAT.
Battery inverter AC systems
- the Stealthgen's output is used to charge a battery bank.
The battery bank has an inverter which produces 240 volts AC. A
battery-based system can produce power during periods of grid failure
and will function as part of a stand-alone supply to an off-grid
building. We generally recommend that the D400 is installed together
with a regulator to prevent battery damage through overcharging.
£1041.67 ex VAT = £1250.00
is either the 6TB12 or the 6TB24.
£181.92 ex VAT = £218.30 inc VAT for the 12v version
£203.49 ex VAT = £244.19 inc VAT for the 24v version
Using a Tristar 60A regulator you can run up
to 250 watts of Solar panels as well as the D400.
** A Dumpload may also be
12V or 24V
is £19.32 ex VAT = £23.18 inc VAT
Spare set of
D400 blades is £ 169.70 inc VAT
Shipping cost extra -
based on customer delivery address and equipment list (delivery
weight). Standard delivery cost in the UK is £ 25.00 inc VAT
installations do not need a bypass switch, but customers may want to
install a stop switch to slow and stop the blades prior to securing.
micro wind/ photovoltaic systems -
Stealthgen can be used to supplement the power from other devices such
as diesel generators and PV arrays.
direct supply to fluorescent lighting
DC supply to water heating
Battery charging (transport)
Hybrid ground source heat pump systems
Practical Boat Owner magazine Nov
2005 test for BEST OUTPUT.
the most popular wind generators used by yachtsmen were tested over
the summer. The testers were keen to assess output at 9 knots wind
speed, which is the average summer wind speed on the UK’s south coast.
And in such gentle breezes, the D400 proved
to be more than twice as productive as the
next best machine, even though two of the other units were
larger. The output recorded was 3.8 amps.
In fact, the D400 continued to outshine its competitors up to wind
speeds of nearly 20 knots, when the Air X joined in. The D400 was also
judged to be “exceptionally quiet”.
Specifically designed for installation
on boats, and on or near buildings
• Almost silent in operation
• Smooth running with optional integral
• Unparalleled low wind speed performance
• Low tip speed ratio, 1.1 metre diameter rotor
• Advanced variable camber airfoil blades
• Robustly engineered for long trouble-free service
• Highly efficient, low-speed, 3-phase axial field
permanent magnet alternator
• Excellent heat dissipation with heavy duty
encapsulated windings for sustained
high output operation
• Aesthetically attractive design
• Corrosion-resistant materials used throughout
• Available in 12, 24, 48 and 72 volt DC
• Turning circle – 585 mm
• Mounting tower 2’’ O/D tubing
• Weight 15 kilograms
The length of
the tower liner (insert into the pole) is 80mm.
10 knots wind speed produces 40 watts
15 knots wind speed produces 120 watts
20 knots wind speed produces 190 watts
25 knots wind speed produces 280 watts
32 knots wind speed produces 400 watts
NOTE: These figures are representative of performance at sea
level when operating in an open, turbulence-free site.
D400 turbines can
be installed singly or in multiples.
Each micro wind installation will produce up to 10 kW
hours per day under 'ideal' conditions, depending on the prevailing wind speed.
A realistic annual yield at a
typical urban site would be around 660 Kw hours which equates to a
daily average of 1.8 kW hours per day (20% of average UK household
bills are based on an annual
of 3,300 kWh/year
or 9 Kwh /day. (Source : Government News Network, Nov
Consumption varies according
to whether the household has two working people (around 4200 Kwh
/yr), one single person (around 3000 Kwh/yr) or a family with
children at school (around 5400 Kwh/yr)
1 x D400 WILL PRODUCE
AROUND 660 kW hrs OF ELECTRICITY IN 1 YEAR AND SAVE 0.27 tonnes OF
IN A 25 YEAR LIFESPAN 1 x D400 WILL PRODUCE ABOUT 16500 kW hrs OF
ELECTRICITY AND SAVE 6.75 tonnes OF CO2