Libellula - Model 20 kW -Small Wind Turbine
Libellula 20 kW is a simple and efficient small wind turbine, designed to maximize efficiency in energy production. It is equipped with a large 2 bladed rotor which grant simplicity of installation and high performances even in less windy sites. Reliable and safe, Libellula 20kW is the ideal turbine for farms, small industries and communities.
- Libellula 20kW is a small wind turbine designed to maximize efficiency in energy production, simplicity of installation, safety and reliability.
- Libellula 20kW can be installed on grid or off-grid. The large rotor (17,4m) and the direct grid connection (no inverter losses) grant high performances even at low wind speeds.
- Libellula 20kW is the ideal wind turbine for farms, small industries and communities. With an average wind speed of 6 m/s, it will produce around 75.000 kWh/year.
General
- cut-in wind speed 3 m/sec.
- rated wind speed 10 m/sec
- cut-out wind speed 25 m/sec.
- extreme wind speed Ve50 = 52,5 m/sec.
- IEC class III A
- rated power 20kW
- grid voltage 400V 3 ph 50Hz
Rotor
- number of blades 2
- diameter 17.4 m
- speed 46.23 rpm
- power regulation passive stall
Gearbox
- type 2 stages – planetary gear
- ratio 1:32.9
Main Generator
- type asynchronous - 4 poles
- nominal voltage 400 V
- frequency 50 Hz
Connection
- On-grid applications direct grid connection
Tower
- type cylindrical pipe
- number of sections 2
- hub height 20 m (other on request)
- material hot dip galvanized steel
- ascent external ladder
Control System
- type n.2 PLC
- remote diagnostic YES
Yaw System
- type active
- yaw motors n.1
- yaw bearing crown-bearing; externally geared
Safety
- disk brake on main rotor shaft
- independent brake calipers n.4
Weights
- rotor 600 kg
- nacelle including rotor 2000 kg
- tower 4000 kg
- Off-grid applications inverter + battery
Power curve
The curve is valid assuming standard atmospheric conditions of 15° C air temperature, 1013 mbar air pressure and 1.225 kg/m3 air density, clean rotor blades and horizontal undisturbed air flow.
Estimated production
The annual energy production data at different annual mean wind speeds are calculated from the power curve data assuming a Rayleigh wind speed distribution, no losses and 100% availability.
