Primus AIR 40


Primus 1-AR40-10, AIR 40 wind turbine, 250 Watt, internal regulator, CSA-listed

Find this useful? Share it with your friends!

PLEASE NOTE: The AIR-40 and High Winds

The AIR 40 was not designed for sustained high wind speeds, and can self-destruct if exposed to those conditions. The alternator inside will overheat, destroying the turbine. If your site regularly sees wind speeds in excess of 50 km/hr (30 mph) for periods exceeding an hour or so, you should be looking at the AIR 30. It handles these events much better, though with the downside of much more noise. The AIR Silent X likewise handles high wind speeds more gracefully and is very quiet, at a higher price point.

The AIR 40 can be used at sites that generally see lower wind speeds, as long as the turbine is stopped using a stop switch for those (winter) storms where high winds for longer periods of time are expected. Note that the Primus Control Panel contains a stop switch as well.

A wind turbine can help keep your batteries charged in winter, when there is little sun. In fact, solar PV and wind complement each other: The days with little sun tend to be windy, and vice versa. The Primus AIR-series of small wind turbines has been around since 1995, with over 150,000 installed since! Theirs is a proven product, for a reasonable price.

The AIR 40 produces best at low to moderate wind speeds. For a high-wind environment the AIR 30 could be a better choice. The AIR 40 is not intended for a marine environment, if salt-spray resistance is needed check out the AIR Breeze, AIR X Marine, or AIR Silent-X. Peak-power output is 250 Watt, and there are versions for 12/24/48 Volt battery-charging applications in desert or Arctic environments. It delivers the energy you need for communications, or remote monitoring, to name a few. A small wind turbine can also be a great addition to an off-grid system, to provide energy during those dark (but windy) winter days. With a build-in charge controller, the AIR 40 provides energy quietly and efficiently. These are the official type codes:

Primus 1-AR40-10-12: 12 Volt AIR 40
Primus 1-AR40-10-24: 24 Volt AIR 40
Primus 1-AR40-10-48: 48 Volt AIR 40

It is recommended to have at least a 200 Ah @ 12V, 100 Ah @ 24V, or 50Ah @ 48V battery bank size, to avoid frequent starting/stopping of the turbine. Also recommended is Primus’ Digital Wind Control Panel to make it easier to start/stop the turbine, provide overcurrent protection, and show power production.

Be sure to check out the Primus Webinars to learn more about installation, wind resources, turbine placement etc. See our Site Selection page for the best place to install your wind turbine.

Please note that the Primus turbines start to protect themselves from overheating above wind speeds of around 35 mph (16 m/s). This means it shuts down for 2-1/2 minutes, then runs again for a some of time, and shuts down again, this repeats. The effect is much lower energy production for these very high (and unusual) wind speeds. This is normal, and necessary for the turbine’s survival.


  • 1.17 meter (46″) rotor diameter
  • 3.1 m/s (7 mph) startup wind speed
  • Can produce 40 kWh/month at 5.8 m/s
  • Can withstand winds up to 49.2 m/s (110 mph)
  • Mounts on 1.5″ schedule 40 pipe, 48 mm (1.9″) outer diameter
  • Advanced microprocessor technology for superior performance
  • High wind protection without mechanical braking
  • Lightweight design is simple and easy-to-install
  • Permanent mold cast aluminum body
  • High-quality, field tested components
  • Warranty 5 years
  • CSA-listed

Turbine Selection Matrix

Turbine Location Application Wind Sound
AIR 30 Land Industrial, Oil & Gas, Telecom High High
AIR 40 Land Residential, Education Moderate Low
AIR Silent X Land & Marine Any All Very low
AIR X Marine Marine Industrial off-shore High High
AIR Breeze Marine Sailing, Residential Moderate Low

AIR Turbine Power Curves
AIR Turbines Energy Curve
Find this useful? Share it with your friends!
Find this useful? Share it with your friends!