Abstract: A mobile electric power generation system includes a variable speed generator, an engine to drive the generator, a DC bus coupled to the generator, an inverter coupled between the DC bus and an electrical power bus in the vehicle, an electrical energy storage device coupled to the DC bus, an operator interface including a display and several operator input devices, and operating logic executed by a processor. One operator input device is used to initiate an automatic mode of operation of the system. The operating logic is structured to activate both the generator and the inverter during the automatic mode. Another operator input device is selected to initiate a manual mode of operation. The operating logic is responsive to one input to change activation of the generator and to another to change activation of the inverter.