Device for charging a battery unit and operating a load unit via an inverter, comprising: a load unit having a plurality of connections, wherein the load unit has at least one inductive element (22a, 22b, 22c) between at least two of the connections and wherein the load unit has a delta circuit or a star circuit; an inverter, which comprises a plurality of switching elements and the output of which is coupled to the connections of the load unit, a selection unit, and a control unit, wherein the control unit is set up - in an operating phase to actuate the selection unit in such a way that a first pole of a battery unit is coupled to a first input of the inverter in order to supply same with a battery voltage, and to switch the switching elements of the inverter in such a way that the load unit is supplied with a required AC voltage, wherein the control unit is set up: - in a charging phase in which a voltage tap of an external supply unit is coupled to the first input of the inverter in order to supply same with an external DC voltage or external direct current, to actuate the selection unit in such a way that the first pole of the battery unit is coupled to one of the inductive elements (22a, 22b, 22c) of the load unit and to switch the switching elements of the inverter in such a way that the battery unit is supplied with a required charging current or a required charging voltage by the external supply unit via the inductive element (22a, 22b, 22c) coupled to the battery unit, wherein the inverter in a first time interval and in a second time interval, which occur alternately over the course of the charging phase: in the first time interval of the charging phase couples the external supply unit to a first pole of the battery unit via a first switching element of the switching elements and via an inductive element and a plurality of the switching elements, which are connected to the first input of the inverter, are interconnected in the first time interval; and in the second time interval of the charging phase couples a second pole of the battery unit to the first pole of the battery unit via a second switching element of the switching elements and via an inductive element of the load unit and a plurality of the switching elements, which are connected to the second input of the inverter, are interconnected in the second time interval. a load unit having a plurality of connections, wherein the load unit has at least one inductive element (22a, 22b, 22c) between at least two of the connections and wherein the load unit has a delta circuit or a star circuit; an inverter, which comprises a plurality of switching elements and the output of which is coupled to the connections of the load unit, a selection unit, and a control unit, wherein the control unit is set up - in an operating phase to actuate the selection unit in such a way that a first pole of a battery unit is coupled to a first input of the inverter in order to supply same with a battery voltage, and to switch the switching elements of the inverter in such a way that the load unit is supplied with a required AC voltage, wherein the control unit is set up: - in a charging phase in which a voltage tap of an external supply unit is coupled to the first input of the inverter in order to supply same with an external DC voltage or external direct current, to actuate the selection unit in such a way that the first pole of the battery unit is coupled to one of the inductive elements (22a, 22b, 22c) of the load unit and to switch the switching elements of the inverter in such a way that the battery unit is supplied with a required charging current or a required charging voltage by the external supply unit via the inductive element (22a, 22b, 22c) coupled to the battery unit, - in an operating phase to actuate the selection unit in such a way that a first pole of a battery unit is coupled to a first input of the inverter in order to supply same with a battery voltage, and to switch the switching elements of the inverter in such a way that the load unit is supplied with a required AC voltage, - in a charging phase in which a voltage tap of an external supply unit is coupled to the first input of the inverter in order to supply same with an external DC voltage or external direct current, to actuate the selection unit in such a way that the first pole of the battery unit is coupled to one of the inductive elements (22a, 22b, 22c) of the load unit and to switch the switching elements of the inverter in such a way that the battery unit is supplied with a required charging current or a required charging voltage by the external supply unit via the inductive element (22a, 22b, 22c) coupled to the battery unit, in the first time interval of the charging phase couples the external supply unit to a first pole of the battery unit via a first switching element of the switching elements and via an inductive element and a plurality of the switching elements, which are connected to the first input of the inverter, are interconnected in the first time interval; and in the second time interval of the charging phase couples a second pole of the battery unit to the first pole of the battery unit via a second switching element of the switching elements and via an inductive element of the load unit and a plurality of the switching elements, which are connected to the second input of the inverter, are interconnected in the second time interval.