Charging device for coupling to a motor vehicle in order to electrically charge an energy store of the motor vehicle, - wherein the charging device has an energy intake connection for coupling to an energy source, wherein the energy source is designed to provide generated regenerative energy and energy that can be obtained from a public power supply grid to the energy intake connection of the charging device, - wherein the energy source has an energy generating device for generating the regenerative energy, and a connection device for coupling to the public power supply grid, - wherein the charging device has a first charging mode and, in the first charging mode and in a state in which it is coupled to the energy source and the motor vehicle, is designed to provide a predefinable constant charging power for charging the energy store, characterised in that - the charging device, in the first charging mode, is further designed to cover the predefinable constant charging power as far as possible with regenerative energy, and only in the event that the predefinable charging power can only partially but not exclusively be provided by the regenerative energy that can be provided at the energy intake connection, to simultaneously provide a first proportion of power in the form of regenerative energy and a second proportion of power in the form of energy obtained from the power supply grid in order to charge the energy store. - wherein the first proportion of power can be provided in the form of a maximum proportion of the regenerative energy that can be provided at the energy intake connection by the energy source for charging the energy store, and - wherein the charging device has a communication unit which is designed to communicate with a communication unit associated with the energy source and, in the first charging mode, to request the predefinable charging power in the form of the maximum proportion of the regenerative energy that can be provided at the energy intake connection by the energy source and the second proportion of power in the form of the energy to be obtained from the power grid. - wherein the charging device has an energy intake connection for coupling to an energy source, wherein the energy source is designed to provide generated regenerative energy and energy that can be obtained from a public power supply grid to the energy intake connection of the charging device, - wherein the energy source has an energy generating device for generating the regenerative energy, and a connection device for coupling to the public power supply grid, - wherein the charging device has a first charging mode and, in the first charging mode and in a state in which it is coupled to the energy source and the motor vehicle, is designed to provide a predefinable constant charging power for charging the energy store, - the charging device, in the first charging mode, is further designed to cover the predefinable constant charging power as far as possible with regenerative energy, and only in the event that the predefinable charging power can only partially but not exclusively be provided by the regenerative energy that can be provided at the energy intake connection, to simultaneously provide a first proportion of power in the form of regenerative energy and a second proportion of power in the form of energy obtained from the power supply grid in order to charge the energy store. - wherein the first proportion of power can be provided in the form of a maximum proportion of the regenerative energy that can be provided at the energy intake connection by the energy source for charging the energy store, and - wherein the charging device has a communication unit which is designed to communicate with a communication unit associated with the energy source and, in the first charging mode, to request the predefinable charging power in the form of the maximum proportion of the regenerative energy that can be provided at the energy intake connection by the energy source and the second proportion of power in the form of the energy to be obtained from the power grid.