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Primus Windpower AIR X WIND TURBINE LAND 400W 12V

Primus Windpower AIR X WIND TURBINE LAND 400W 12V
Primus Windpower AIR X WIND TURBINE LAND 400W 12V
Item code Model number Volts Watts
CHECK OUT OUR LIMITED-TIME AirX and AirBreeze Special Deals!

The AIR-X is designed to be mounted on tubing or pipe with a 1.875 inch (48mm) outside diameter. This is equivalent to 1.5 inch SCH 40 pipe. Also, please keep in mind that the data shown for the Air X turbine has been taken in a lab environment. The actual energy production of the turbine may be less than predicted in the graphs below.

Primus Windpower
Small Wind Turbines

Renewable Energy Made Simple

AirX wind turbine

Air-X Wind Turbine Picture     Introducing the latest evolution in small wind turbines. The AIR-X wind generator builds upon what made AIR the world's #1 selling small wind turbine with new technology previously found only in today's state-of-the-art mega-watt-class wind turbines. All of these features are primarily found within the body of the turbine. The new microprocessor based speed control results in increased performance, improved battery charging capability and the reduction of “flutter” noise from the machine. The controller allows for peak-power tracking of the wind by optimizing the alternator's output on all points of the cubic curve and then efficiently delivers the energy to the battery. The turbine’s smart controller allows it to actually control blade rotation speed thus eliminating the buzzing noise commonly found with the AIR 403 and 303 in high winds. Furthermore, a new series of carbon-reinforced blades with a modified pitch angle further increases power production. The new electronics are a considerable improvement over the AIR 403 controller that consists of diode-rectification and a simple off/off voltage switch.


Much Lower Noise: Previous AIR wind turbines relied on their aero-elastic blade design for protection in high winds, causing loud flutter noise in winds above 35 mph (16 m/s). AIR-X’s circuit monitors the wind speed and electronically slows the blades as it reaches its rated output preventing it from going into flutter. This results in a much quieter wind turbine. In high winds, the AIR-X wind turbine will continue to produce power at a reduced level until the wind decreases, at which point maximum output will resume. The Benefit: Quieter and neighbor friendly operation.

Don't Forget to Buy These for Your Air-X Wind Turbine!

DC rated circuit breakers provided the required electrical protection for your Air-X wind tubine installation.

For 12V, choose 50A version
For 24V, choose 30A version
(see related items on right hand side of this page)

Stop Switch
AirX wind turbinesThis DC rated 50 amp switch allows you to "stop" the turbine. Rated at 50 amps DC for both 12V and 24V.

(see related items on right hand side of this page to add this product to your cart)


wind turbinesImproved battery charging: Previous AIR wind turbine designs required 300-400 amp hour battery banks so the trickle charge of the wind turbine could be adequately absorbed. The AIR-X’s charge controller periodically stops charging, reads the battery voltage, compares it to the voltage setting and if the battery is charged, it completely shuts off all current going to the battery. This function is performed within a few milliseconds. The closer the battery is to reaching its full state of charge, the more often the AIR-X’s circuit repeats this action. This means any size battery bank from 25 to 25,000 amp hours or higher can be charged safely. When the battery has reached its charged state, the AIR-X will slow to an almost complete stop. Only when the battery has dropped below its voltage set point will it startup and resume charging. The Benefit: Extended battery life, no overcharging.

Lower stress design: AIR-X limits power on the input side of the electronics by controlling the torque from the blades. The power no longer has to be dissipated by the electronics resulting in lower stress on the circuit, bearings and other materials. Furthermore, stress on wind turbines occurs primarily in high winds. Under these conditions, the electronic stall design reduces the blade speed to 600 rpm, thereby significantly reducing turbine and tower loading while still producing power. The Benefit: Greater confidence in turbine operation in high wind conditions without manually operating the stop switch. Note: A manual stop switch control is an available option for the AIR-X.

Design changes are primarily found within the body of the wind turbine:

  • New microprocessor-based controller.
  • New "wave washer" combined with looser bearing-to-body tolerances are incorporated into the face bearing set. This results in lower compression on the bearing/race, with quieter running and lower startup speed. It also lowers stress on the bearings and shaft when subject to twisting forces during normal operation.
  • New series of carbon reinforced blades.
  • More robust tower clamp and yaw assembly for stronger and more secure tower mounting.

Features of the Air X Wind Turbine

  • Unprecedented 3 YEAR WARRANTY
  • Simple rooftop installation; no tower necessary
  • Carbon Fiber Composite Blades
  • Aircraft quality aluminum alloy castings
  • Exclusive Brush-less neodymium cubic curve alternator
  • Sophisticated internal battery charge regulator
  • Maintenance-free - Only two moving parts
  • Exclusive Auto-brake-feature that slows the AIR to a silent spin when the batteries are charged thus extending bearing life and reducing noise.
  • High Wind Safe Mode - Automatically slows turbine in potentially damaging winds and reduces noise.
  • Neighbor Friendly.

Air X Applications



  • Remote homes & cabins
  • Water pumping
  • Recreational vehicles
  • Battery charging
  • Science & education projects
Rotor Diameter:
46" (1.14 meters)
13 lbs (6 kg)
Start up wind speed:
7 mph (3 m/s)
12 & 24 VDC (36/48 VDC available soon)
400 watts at 28 mph (12.5 m/s)

Performance Curves

AirX wind turbines
Air-X wind turbines


Here are some tips from the altE staff

  • Air X users have reported that it is relatively common for the turbine to work in “fits and starts” because of the way the controller functions. This should not be a problem. Also, some folks on boats complain of the clatter of the stopping and starting of the blades. Wind turbines do make noise, and on a boat, this noise can be amplified. Please check with your local marina to be sure that you can use the air X on the boat when you are not there. Southwest Windpower now has the new Air Breeze model with slightly different blades and an updated controller. This should reduce noise.
  • What is the minimum size battery bank I can install with this wind turbine?
    • For all 12V units it's 400 amp hours. For all 24 and 48 volt units it's 200 amp hours. Why is this so? The reason is because the smaller the battery bank, the more time the turbine will spend in regulation mode. In other words, when the battery bank is full, the turbine will be regulating, and this puts more stress in the internal components of the turbine, which in turn shortens the life of the unit. According to the manufacturer, an inadequately sized battery bank will void the warranty for the turbine. Is there any way around the minimum sized battery bank? IF one uses a diversion load controller with a properly sized diversion load, one can get away with a smaller battery bank.
  • My Air wind turbine seems to start spinning but then quickly slow down and not work. What's wrong?
    • Because the AIR series have internal electronic charge controllers, they must be connected to a battery bank with a voltage of at least 10.5 volts DC in order to function. When customers observe that their AIR is spinning up then braking in a repeating cycle (spin up to speed, LED flashes for a second or two, then a sudden braking) this almost always indicates that the AIR is either not connected to the battery bank or the battery bank is bad. Common causes are a failed wire connection, a blown fuse, mis-wiring the stop switch, grossly undersized wiring, or severely discharged or damaged batteries.
  • Can I connect my AIR directly to a pump or light?
    • No. The turbine has an electronic controller and it must be connected to a battery bank to function properly. The turbine cannot be connected directly to a load such as a pump, fan or inverter.
  • Why am I only measuring 5 or 6 volts from my AIR?
    • The turbine controller circuitry must sense a battery bank voltage of 10.5 volts (for a 12V turbine) or 21 volts (for a 24V turbine) in order to operate properly. If you attempt the "drill spin" test, as outlined in the Bench Test section of the manual, please note that the turbine must be connected to a battery. If done without the battery connection, you will only measure a fraction of the rated voltage output. This is normal.
  • How do I know the AIR is charging?
    • For a precise indication of charge current you will need to install an amp meter (ammeter) in your system. The meter or meter shunt should be installed in-line on the positive wire. Almost any amp meter with a suitable current capacity and range will work. We offer a 30 Amp ammeter (in the search bar above on our site, just search for the phrase '30A ammeter').
  • Can I run my AIR through my solar panel controller?
    • Because the turbine must be able to sense battery bank voltage, the AIR cannot be run through external controllers or devices that contain diodes. These are frequently found in solar panel controllers, to keep the panels from discharging at night - but, these diodes will put the turbine into "open circuit" mode and prevent energy production.
  • How do I use the stop switch?
    • When wired as shown in the manual diagram, RUN is up and BRAKE is down. Do not use the center switch position - this is "open circuit" and the turbine will not produce any charging energy for you. Worse yet, this position will cause the turbine to repeatedly cycle between spinning and braking, which can cause excessive wear and can void your warranty. The stop switch is included with the Marine version of our AIR products, so that sailors can turn off the turbine while in a slip or mooring. In other cases, the stop switch is not needed and the AIR will brake on its own when in regulation or during extremely high wind speeds. If your installation calls for a stop switch, you can purchase a 50A stop switch (in the search bar above on our website, just search for the phrase 'stop switch').
  • What does the red LED indicate?
    • The red LED on your new turbine can provide important information. When steady, the AIR is charging. Slow blinking indicates regulation. If you don't see a charge indicator or regulation flashing, under normal operating conditions, then check your wiring for bad connections or breaks. Don't forget to check the fuse or circuit breaker.

Short Lifetime


My Air-X died after 2 years only. Probably molded circuit-board due to high humidity, which however rnan outdoor application like this should be able tornhandle. Factory said: Warranty out. New circuit-board ~120$.rnI ditched it since it did no
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Air 303/404 wind turbine


I have had both of these wind turbines over the years and have installed them for others. rnOne big problem is the blades do not hold up and start hitting the pole, which then shatter the blades. I have had one turbine that I had to replace blades
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It needs plenty of wind


The power generation curve is pretty steep and narrow. You'll need almost 20 mph to start producing anything worthwhile. In a 30 mph wind it does it's job very well. In a 40 mph wind power output will drop off considerably. When shorting the output w
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