Energy supply unit for a motor vehicle, having - an electrical energy store for storing electrical energy, - electrical connection means for connecting the electrical energy store to an external voltage source of a charging station via charge electronics in order to charge the electrical energy store, - a first current branch in order to supply electrical energy to a drive train having an electrical drive of the motor vehicle, which is used to drive driven wheels (16L, 16R) of the motor vehicle, - a second current branch in order to supply electrical energy to heating and/or air-conditioning means of the motor vehicle, - a first power capture unit which is connected to input lines or input terminals of the charge electronics and is used to capture the electrical energy transmitted from the charging station to the electrical energy store, and - a second power capture unit and a third power capture unit which are designed to separately capture the electrical energy consumed by the electrical drive and the electrical energy consumed by the heating and/or air-conditioning means, characterized in that the energy supply unit has a control unit which is connected to the second and third power capture units (46, 48) in order to determine values of the respectively consumed electrical energy, wherein the control unit is connected to the first power capture unit which is assigned to the connection means in order to determine the total electrical energy consumed by the energy supply unit and in order to separately capture the total consumed energy and the electrical energy consumed by the electrical drive and by the heating and/or air-conditioning means. - an electrical energy store for storing electrical energy, - electrical connection means for connecting the electrical energy store to an external voltage source of a charging station via charge electronics in order to charge the electrical energy store, - a first current branch in order to supply electrical energy to a drive train having an electrical drive of the motor vehicle, which is used to drive driven wheels (16L, 16R) of the motor vehicle, - a second current branch in order to supply electrical energy to heating and/or air-conditioning means of the motor vehicle, - a first power capture unit which is connected to input lines or input terminals of the charge electronics and is used to capture the electrical energy transmitted from the charging station to the electrical energy store, and - a second power capture unit and a third power capture unit which are designed to separately capture the electrical energy consumed by the electrical drive and the electrical energy consumed by the heating and/or air-conditioning means, characterized in that the energy supply unit has a control unit which is connected to the second and third power capture units (46, 48) in order to determine values of the respectively consumed electrical energy, wherein the control unit is connected to the first power capture unit which is assigned to the connection means in order to determine the total electrical energy consumed by the energy supply unit and in order to separately capture the total consumed energy and the electrical energy consumed by the electrical drive and by the heating and/or air-conditioning means.