A system of managing charging schedules in a fleet having electric vehicles includes a command unit. The command unit has a processor and tangible, non-transitory memory on which instructions are recorded. The command unit is adapted to define a plurality of discharge categories, including a transportation category, a transfer category and a reserve energy category. The respective battery power in the electric vehicles is proportioned by setting a respective percentage allocation for the plurality of discharge categories. The command unit is adapted to signal the electric vehicles to charge when at least one of the plurality of discharge categories falls below the respective percentage allocation. The command unit may be adapted to group the electric vehicles in respective virtual boxes based in part on their respective physical locations.