... AC generator. 2,Certificate of ISO9001:2008. Automatic voltage regulator SY-AVR-20581,Introduction:Model: 2058 series Introduction: SY ... controller, water preheater, generator synchronizer, genset controller, power factor regulator, fuel solenoid, charger for engine start battery, actuator, speed ... are approved by ISO9001:2008 standard. Auto Voltage Regulator For Diesel Generator SY-AVR-2058