A modular vehicle system, comprising: - an electric vehicle, in particular a lightweight electric vehicle, comprising at least: - one high-performance electrical system for supplying energy to an electrical drive unit, - one or more interfaces connected to the high-performance electrical system for connecting to at least one module (20, 20'), and - a control apparatus that is designed to communicate with the at least one module (20, 20'), and - at least one module (20, 20'), comprising - a connection element that is releasably connectable to the interface, - an electrical assembly for connecting to the high-performance electrical system, and - a module control, characterized in that - the module control of the module (20, 20') and the control apparatus of the electric vehicle are designed to communicate in a compatibility mode in order to check the electrical compatibility of the module (20, 20') with the high-performance electrical system, wherein - the module control is designed to send an identification signal to the control apparatus when connecting the connection element to the interface, - the control apparatus is designed to receive the identification signal, - the control apparatus is designed to ascertain at least one electrical operating parameter of the assembly from the identification signal, wherein the electrical operating parameter of the assembly is any electrical value suitable for a comparison such as for example voltage, current, performance and/or battery capacity; - the control apparatus is designed to compare the ascertained operating parameter with at least one electrical compatibility parameter of the high-performance electrical system, wherein the electrical compatibility parameter of the high-performance electrical system is any electrical value suitable for a comparison such as for example voltage, current, performance and/or battery capacity, and in the event that the ascertained electrical operating parameter corresponds with the electrical compatibility parameter, to send an activation signal to at least one switching unit to connect the electrical assembly to the high-performance power system. - an electric vehicle, in particular a lightweight electric vehicle, comprising at least: - one high-performance electrical system for supplying energy to an electrical drive unit, - one or more interfaces connected to the high-performance electrical system for connecting to at least one module (20, 20'), and - a control apparatus that is designed to communicate with the at least one module (20, 20'), and - one high-performance electrical system for supplying energy to an electrical drive unit, - one or more interfaces connected to the high-performance electrical system for connecting to at least one module (20, 20'), and - a control apparatus that is designed to communicate with the at least one module (20, 20'), and - at least one module (20, 20'), comprising - a connection element that is releasably connectable to the interface, - an electrical assembly for connecting to the high-performance electrical system, and - a module control, characterized in that - a connection element that is releasably connectable to the interface, - an electrical assembly for connecting to the high-performance electrical system, and - a module control, - the module control of the module (20, 20') and the control apparatus of the electric vehicle are designed to communicate in a compatibility mode in order to check the electrical compatibility of the module (20, 20') with the high-performance electrical system, wherein - the module control is designed to send an identification signal to the control apparatus when connecting the connection element to the interface, - the control apparatus is designed to receive the identification signal, - the control apparatus is designed to ascertain at least one electrical operating parameter of the assembly from the identification signal, wherein the electrical operating parameter of the assembly is any electrical value suitable for a comparison such as for example voltage, current, performance and/or battery capacity; - the control apparatus is designed to compare the ascertained operating parameter with at least one electrical compatibility parameter of the high-performance electrical system, wherein the electrical compatibility parameter of the high-performance electrical system is any electrical value suitable for a comparison such as for example voltage, current, performance and/or battery capacity, and in the event that the ascertained electrical operating parameter corresponds with the electrical compatibility parameter, to send an activation signal to at least one switching unit to connect the electrical assembly to the high-performance power system.