RECHARGEABLE ELECTRICAL ENERGY STORAGE

The present document describes an auxiliary electrical energy storage system for a vehicle such as a semi-truck comprising a main electric energy storage component (main EESC), an ICE, an alternator, and accessory components generating an auxiliary load. The auxiliary electrical energy storage system has an auxiliary EESC; a DC/DC converter electrically coupled to the main EESC, the auxiliary EESC, the alternator, and the accessory components; and a controller coupled to the DC/DC converter, controlling flow of energy in and out of the EESC's. Such system allows to power the auxiliary load when the vehicle is in an idle state.