**Model
**Airforce 4.1 Off-grid
**Rated output power
5 kw
**Rotor diameter
4.1 m
**Max. output power
5.1 kw
**Blade length
2.02 m
**Voltage
48 Vdc
**Blade material
**FRP
**Rated wind speed
12 m/s
**Generator
3 phases PM generator
**Max. wind speed
20 m/s
**Braking system
**Electromagnetic braking control system
**Survival wind speed
60 m/s
**Type
**Downwind rotor
**Start-up wind speed
1.5 m/s
**Yaw control
passive
Cut-in wind speed
2 m/s
Total weight
120 kg
Rated rotational speed
400 rpm
Warranty
Whole system-2 years
Max. rotational speed
450 rpm
Controller
Full-automatic control
No. of blades
3
Tower
12 m(optional)