A power converter for an engine generator includes an insulative support that receives and supports circuit components for converting incoming AC power to desired power, such as power suitable for a welding application. One or more rectifier modules are provided that are received and supported by the support. Three such modules may be provided for receiving three phase power from a generator. DC power from the rectifier module is applied to DC bus plates. The plates may be coupled to capacitors. A power conversion circuit, such as a buck converter, is coupled to the DC bus plates to convert the DC power to output power.