SDC series generating and welding dual use sets will be the best to be driven by an internal combustion engine. They can be used as mobile or stable power supply unit which is suitable for using in towns, countrysides, boats, workshop for lighting or welding purpose. This series alternator can serve as lighting or as welding individually, further more, they can serve both as welding and as illumination simultaneously. Operating Condiyions: 1. Altitude: not exceed 1000m. 2. Cooling air temperature: 258~313K(-15 oC ~ 40 oC) 3. Relative air humidity: not exceed 90%.