JFP 400kW (500kVA) Open Type Open Frame Yuchai Gas Generator Set with Marathon Alternator This 400kW (500kVA) open-frame gas generator set adopts original Yuchai industrial gas engine matched with Marathon brushless synchronous alternator. It is designed for continuous prime power supply, adaptable to natural gas, biogas, landfill gas, CNG/LNG. The open-frame structure brings convenient maintenance, excellent heat dissipation, low operation cost and low exhaust emission.