Lehnhoff Levento - Windenergieanlagen im kleinen Maßstab
Small-scale wind energy converter systems need up-to-date technology solutions, as well as viable concepts that make running them in close proximity to residential and business areas an attractive option – not only for economic reasons, but also regarding visual and acoustic concerns.
The Levento 1 fulfills all these requirements, taking its looks and pleasantly smooth running performance from historical models, while possessing technical features expected of a modern wind energy converter: Adjustable blade angles and the dual speed concept allow for precise power regulation, as well as a substantial output. With a large rotor ensuring high energy yields, the emphasis on robust technical solutions makes this small-scale wind energy converter a reliable source of electricity.

The Levento 1 owes its existence to 20 years’ worth of experience in the technology of megawatt-class wind energy converters, fused with comprehensive design studies regarding their smaller counterparts.
Technical Data
General
Model Levento 1
Rated power 5 kW
Cut-in wind speed 3 m/s
Rated wind speed 10.5 m/s
Cut-out wind speed 25 m/s
Design code IEC 61400-2
Type class IEC III, 7.5 m/s
   
Rotor
Rotor diameter 6.5 m
Rated speed 35 min-1
Rotor area 33.2 m2
   
Rotor blade
No. of blades 15
Material Steel
Length 2 m
 
Gear box
Type Helical gear box
Gear Ratio approx. 1:40
   
Power electrics
Generator dual speed induction type, 400 V ac
Grid connection Thyristor controller, reactive power adaptation
 
Control systems
Power control Blade pitch control
Turbine control system plc controller
Yaw system Wind vane
Safety systems 1.: Blade pitch control
  2.: Disc brake
 
Tower
Typ Steel tube, cylindrical
Hub height 15 m
 
Status August 2014