An energy system for a vehicle system having a plurality of motors that may include a first power supply assembly that may also include a first battery assembly of a plurality of battery assemblies. The first power supply assembly also may include a first bus coupled to a first motor of the plurality of motors and coupled to the first battery assembly. A second power supply assembly may also be provided that includes a second battery assembly of the plurality of battery assemblies coupled to a second bus that is coupled to a second motor of the plurality of motors. A controller may also be provided that may be configured to vary conduction of electric current from the first battery assembly to the first motor by the first bus based on an operating condition of the second power supply assembly to provide a first input to the first motor that may be different than a second input provided to the second motor by the second battery assembly.