Primus AIR 40


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

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

Be sure to check out the Primus Webinars to learn more about installation, wind resources, turbine placement etc.


  • 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


Turbine Selection Matrix

Low to Moderate Wind Speeds High Wind Speeds Very High Wind Speeds
under 5.5 m/s (12 mph) average December wind speeds 5.5 – 7 m/s (12 – 15 mph) average December wind speeds Over 7 m/s (15 mph) average December wind speeds
Coastal Use AIR Breeze AIR X Marine, AIR Silent X AIR X Marine, AIR Silent X, with TriStar 45 and TL-100 diversion load
Inland Use AIR 40 AIR 30 AIR 30 with TriStar 45 and TL-100 diversion load

The marine-type turbines (AIR Breeze, AIR X Marine, and AIR Silent X) can of course also be used at inland sites. They are just a more corrosion-resistant version of the inland wind turbines.

AIR Turbine Power Curves

AIR Turbines Energy Curve



Mnfr. model

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Battery Voltage

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Rated output power

250 Watt @ 11.6 m/s (26 mph)

Startup wind speed

3.1 m/s (6.9 mph)

Rotor diameter

1.17 m (46")

Rotor swept area

1.07 m^2 (11.5 ft^2 )

Temperature range




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