Abstract: An energy supply unit (15) for an electric motor vehicle (1b) comprises a first interface (10) on the alternating voltage side to a vehicle-external power network, a second interface (16) on the direct voltage side for the connection to an onboard power system of the electric motor vehicle (2b), and an AC/DC converter (17) arranged in a current path between the first interface (10) and the second interface (16). Additionally, the energy supply unit (15) comprises a third interface (18) on the alternating N voltage side, for the connection to an alternating voltage generator (12) and a switching device (19) to connect the second interface (16) to the first interface (10) or the third interface (18) via the AC/DC converter (17). The AC/DC converter (17) may be connected to said vehicle-external power network or to said alternating voltage generator (12), which is driven by a combustion engine (11). In addition, an electric motor vehicle (1b) having such an energy supply unit (15) is set forth.