146 Watt Vertical wind turbine
to 40 watt solar panels
winds it can produce 50% more electricity than a 100 watt PV
which sell for up to $699.
Questions? Call 800-658-8745
axis Airfoil enhanced Savonius turbine
Support Frame included
Built of Tough Impact Resistant Plastic
Incredibly strong yet light design.
Starts turning in 1 MPH wind.
Starts charging in 10MPH wind
Silent in wind speeds to 25MPH
Total swept area of 36 inch X 24 inch
Low friction ball bearings top and bottom
Can be installed by single person
Bird friendly low RPM design
Permenant Magnet Axial flux alternator.
No brushes to wear out or
No brush related electrical
Easy UPS Shipping
- Mobile computer charging in remote locations
- Small scale lighting
- Portable computer charging in field or forest
- Extended use of Instruments or Telemetry
- Signs & Lighting
- Signal repeating
- Bolt to banister
- Clamp to pole
- Tie to a fence post.
- Even clamp to top of car roof
- Clamp to boat mast
the sun isn't shining
wind is normally blowing.
small wind turbine has big features
that make it ideal to augment Solar Photo Voltaic (PV) systems.
Savonius turbines are well known for high torque, silent
robustness. This robust unit is designed around our high strength
proprietary plastic design retains the heritage of strength while
providing optimal performance. This turbine incorporates
modern design based on airfoils to maximize efficiency while a
simplified mechanical model makes it strong winds.
This turbine starts turning in 1 MPH winds and
torque even in low winds. This makes it ideal for locations where the
is erratic and turbulent.
An advantage of the Savonius turbines is
they turn slower than their horizontal axis propeller based relatives.
Even in high winds the unit is turning slow enough to avoid injuring a
Wind turbine farms have a terrible reputation for noise.
this is caused by the lift based designs of the propellers which turn
the propellers at speeds substantially higher than wind speed. This
unit is nearly silent. In 25 MPH winds I could hear no noise at all
the unit. At 30MPH there is a slight sound of rushing air as it blows
through the center cavity since it is accelerated like a Venturi
through the center.
Our Power estimates use a CP (Coefficient of Power) of 0.27
although our design may be a bit higher. It uses a assumption of a
electric generator which is 85% efficient and that the bearings and
gears are 95% efficient.
|Wind Speed MPH
||meter per sec
out in watts
||Amps @ 12V
At speeds above 40MPH the efficiency drops off which is part
design to help protect the unit from damage in high wind speeds. As a
result calculations for wind speeds above 40MPH would be inaccurate.
These estimates are based on a university formula not empirical test
results. A CP of 0.27 was used with a 85% efficient generator and 95%
DC power cables experience voltage drop more severe than AC wiring.
In general it requires larger wires to carry DC power than AC
power. For this reason most installations keep the DC wires
20 foot long. DC wires that are too small and which are
too much current will overheat and should be avoided.
Axial Flux Alternator
Generating usable power in low wind speeds is a challenge.
XDOBS has designed a special alternator using very powerful
permanent magnets which can produce 12 Volt output at speeds as slow as
This alternator does not use any brushes so there is none of
electrical noise commonly associated with DC generators. There
are no brushes to wear out which makes the unit more reliable for
remote and hard to service locations. Servicing
in generators is one of the more onerous repetative service aspects of
power generators which this design eliminates.
Unlike most auto alternators which use part of the power they
generate energize field coils this alternator uses more expensive
permanent magnets which makes the system more efficient by
saving the energy normally invested in the coils.
addition it eliminates the need to pass power back into the moving
turbine which eliminates the need for the brushes.
A solid state rectifier is used to convert the AC voltage to
pulsed output. As a result the alternator outputs a variable
voltage and variable frequency. The voltage goes up as wind
up as it is directly dependent on the current RPM. The variable
voltage is generally not a problem however some devices are sensitive
voltage and frequency. When used to charge
batteries the batteries
them selfs act as a filter absorbing the pulsed DC input and turning it
into a constant DC output.
In strong winds the power
output is substantial and could overheat some batteries. It
is a wise
precaution to use a charge controller to maximize battery
elsewhere for PMG (Permenant Magnet Geneators) and you will find they
start at $380 which is more than 1/2 the cost for our entire unit
the turbine and the generator.
- Charge & Current controller - Add on option may be
ordered with turbine. These controllers sense
speed and adjust current flow to allow optimium blade speed which can
be very helpful in lower wind speeds. It also
senses coil temperatures and prevents excess current from being drawn
off the unit during high wind speeds. Finally is
the battery voltage and switches over to trickle charge when the
battery if full. It automatically routes the excess power to
second cable output which can be used to feed secondary applications
such as pumps, fans, sign lights, etc.
- A charge controller for very sensitive instruments
available. This controller alternately charges two separate
battery banks and switches the load between them such that the load is
completely isolated at all times from the pulsed DC input charging from
the alternator. This eliminates any background noise that
effect very sensitive measurements.
- Extended Cables. Base unit comes with 2 meters of
resistant electrical wire. User must supply wire to run from
point to the batteries. XDOBS can add up to 20
additional UV resistant wire.
- Custom sizes available.
These units can be ordered in sizes from 12" X 12" up through
90 X 180 inches. Narrow turbines turn faster while
wider turbines provide higher torque. The axial flux
alternator is designed to work with the speeds commonly provided by a
20" to 24" wide turbine.
- Default color is off white cream. Specify
color at time of shipment. Choose from any valid Kyrlon or
Rustoleum paint color.
- Volume discounts start at 10 units.
Plastic Polycarbonate is a clear plastic that is
incredibly tough and UV
resistant. Some people prefer a clear turbine which
accommodate but it polycarbonate costs an addition 30%.
Some people prefer bright fluorescent or mirrored turbines.
produce these with special acrylic plastics at 50% additional.
- Back lights installed turbines
installed with signs.
- Reversed generator allows AC power to be delivered on the
turbine blade to use for sign lighting.
- Shipping box is approximately 46" X 12" X 26" and weights
about 50 pounds.
- Shipping generally runs about $130 but can be extra depending on
International, Alaska and Hawaii.
- Each unit is custom made when payment is received. In
cases items are shipped within 1 week of order. During times of heavy
order volume we tend to become backlogged and it may require up to 9
weeks to ship order. If your unit is for Christmas or
Birthday let us know and we will try to expedite.
- We buy parts for your turbine and as such there is a 50%
fee for returned items.
- Using a Tower will increase the wind speed the blades
encountering. According to some text books each 60 foot of elevation
off the ground will yield 2MPH increase in wind speed. Our frame
assumes you will be installing the turbine frame directly supporting
rail or pole.
- Installation needs to be above any near by fences
or at least 150 foot
away from the nearest building when ground installed. May be
installed closer but efficiency may suffer.
- The mounting
frame is easily adapted for tower top installation but we feel that the
ease and simplicity of ground based installation may make it better to
install more turbines instead.
- Moving water packs a incredible punch so even our super
strong design may not withstand floods where moving waves hit the unit.
Hurricane driven waves and tsunami will invalidate any warranty and are
likely to destroy the unit.
- This charger is capable of producing large amounts of power
especially in high winds. It is recommended that a charge
controller be used to limit charging current to the battery bank if
used for extended periods of time.
- One year warranty on parts and labor. Warranty
include repair or replacement. Liability is limited to
replacement cost of the unit. Warranty service is performed
factory. User may pay freight to return unit to factory. User
may request some parts to be replaced in the field which XDOBS may
approve in lieu of returning entire unit for service.
void if unit is exposed to hurricane force winds or other extreme
weather phenomenon. Warranty void if unit is
more then 3 foot.