Freen OÜ announces the official European market launch of its horizontal-axis 20 kW model, Freen-H20. Designed for distributed wind energy generation, the Freen-H20 is engineered for efficiency, structural resilience, and compatibility with a wide range of installation sites.
Built for Power and Efficiency
The Freen-H20 is equipped with a 20 kW asynchronous generator and a planetary gearbox, delivering stable output with a rated rotor speed of 51 rpm. The turbine features a three-blade rotor with a 15-meter diameter, offering a swept area of 177 m².
The system uses a passive yaw mechanism guided by an aerodynamically shaped tail fin, and includes multiple integrated safety features:
- Centrifugal tip brakes that deploy at high rotational speeds,
- An electromechanical brake that activates when the system powers down,
- Aerodynamic stall functionality that reduces rotor speed at high wind speeds.
The Freen-H20 is designed for IEC Class II wind conditions and can operate across a wide temperature range, from –25°C to +60°C.
Proven Engineering Inside the Nacelle
Freen’s engineers combined an asynchronous generator with a compact planetary gearbox to keep rotor speed constant at 51 rpm, maximising output and grid quality with minimal wear. A passive yaw system—guided by an aerodynamically profiled tail fin—eliminates electric yaw motors, cutting parasitic losses and simplifying off-grid operation. Safety is layered:
- Centrifugal tip-brake segments deploy automatically at overspeed,
- A spring-activated electromechanical brake engages on loss of power, and
- The blade profile naturally induces aerodynamic stall in extreme winds.
These redundancies ensure reliable performance and low-risk operation across Europe’s diverse wind corridors.
Main Technical Parameters
- Rated power: 20 kW
- Generator type: Asynchronous
- Gearbox type: Planetary
- Rotor diameter: 15 m
- Swept area: 177 m²
- Rated rotor speed: 51 rpm
- Cut-in wind speed: 3.5 m/s
- Rated wind speed: 11 m/s (corresponds to 16.5 kW output)
- Survival wind speed: 42.5 m/s
- Total turbine height: 43.5 m (with 36 m tower)
- Noise level: 45 dB (measured at 60 m)
- Operating temperature: –25°C to +60°C
- Design lifetime: 20 years
- Total system weight: 4,870 kg (turbine + 36 m tower)
Tower height options include 12 m, 24 m, and 36 m, allowing adaptation to specific site conditions.
Annual Energy Production
The Freen-H20’s performance is validated through a certified AEP curve based on a Rayleigh wind distribution (K = 2). The turbine delivers consistent energy production across a range of average wind speeds. Specific AEP values are available upon request or through detailed site analysis.
Availability and Compliance
The Freen-H20 is manufactured in Estonia and built according to ISO 9001:2015, ISO 3834-2, and CE EN 1090-2 standards.
