A central controller may use an algebraic formula to control the charging of electric vehicles (EVs). The algebraic formula may provide for at least two strategies for allocating power to EV chargers: (1) focused charging to a subset of chargers or (2) a semi-level loading to all chargers. Under the focused charging strategy, the system controls the total power delivered to all chargers by providing full power to higher priority charger(s) while delaying any power to lower priority charger(s). Meanwhile, under the semi-level loading strategy, the system controls the total power delivered to all chargers by providing approximately the same power level to all chargers with specific chargers receiving more or less power based on each charger's priority. The system calculates charger priority on an ongoing basis for all chargers connected to an electric vehicle. The system may assign a charge priority value to each charger based on multiple methods.