... , Here some info for your reference. NK series gas generator setGenerator set type20GFT25GFTRated power 20kW25kWRated frequency50/60HZRated voltage400VPower ... parallel running system6,Other extend function device 1,NK series generator set is designed, assembled, tested and qualified ... operation and convenient maintenance.2,Alternator adopts XN164 series.and you may choose Faraday, Stamford or Siemens ...