... (2)Low wind speed model,has electric brake (3)Overcharging protection, stable output voltage It build in MPPT charge controller Parameter ... three SUS304 M4x10 hexagonal screw ,It will never broken andblow off the hub4,GeneratorOulu generator is made of SUS304 material . ... the body .It is a full Intelligent controller,Voltage rise,auto brake,autounloading,12/24V auto distinguish,auto week up and so on , ...