Patent ID: 8680812

Claim:
An electric vehicle charging system comprising: a plurality of electric vehicle charging apparatus coupled to, and configured to receive electric power from, a distribution transformer; a central processing device configured to control operation of said plurality of electric vehicle charging apparatus; and at least one sensor coupled to said central processing device and configured to provide said central processing device with data, said central processing device further configured to: determine a present electrical load on the distribution transformer based on the data; receive a charging request from a first electric vehicle charging apparatus of said plurality of electric vehicle charging apparatus; determine if providing power to said first electric vehicle charging apparatus will cause the present electrical load on the distribution transformer to exceed a predefined nominal load rating of the distribution transformer; provide said first electric vehicle charging apparatus with an electric power charging signal if providing power to said first electric vehicle charging apparatus will not cause the present electrical load on the distribution transformer to exceed the predefined nominal load rating of the distribution transformer; compare the present electrical load to a predefined maximum distribution transformer load rating if it is determined that providing power to said first electric vehicle charging apparatus will cause the present electrical load on the distribution transformer to exceed the predefined nominal load rating of the distribution transformer; deny service to said first electric vehicle charging apparatus if it is determined that providing power to said first electric vehicle charging apparatus will cause the present load on the distribution transformer to exceed the predefined maximum distribution transformer load rating; and place the first electric vehicle charging apparatus in a queue.