Method and device for charging an electric vehicle

A method for charging an electric vehicle comprising:

• connecting the electric vehicle to a charging current from a domestic mains supply connected to a power generating plant, a power supply grid,
• and an energy management device;
• controlling the charging current for charging the electric vehicle by a control device connected to the energy management device, wherein the charging current is selected from at least first and second preset charging currents preset for the control device, wherein the first preset charging current is less than the second preset charging current, and the electric vehicle is charged with one of the at least first and second preset charging currents controlled by the energy management device;
• defining an activation threshold value and a deactivation threshold value for each of the at least first and second preset charging currents;
• selecting the charging current for charging the electric vehicle from the at least first and second preset charging currents by determining a surplus power of the domestic mains supply and a drawn power drawn from the power supply grid and making a comparison between the surplus power and at least one activation threshold value defined for each of the at least first and second preset charging currents and between the drawn power and at least one deactivation threshold value defined for each of the at least first and second preset charging currents, and
• upon reaching the corresponding activation threshold values or deactivation threshold values, activating or deactivating the corresponding preset charging current, the first preset charging current being activated when based on the comparison a first activation threshold value is reached and being deactivated when based on the comparison a first deactivation value is reached and the second preset charging current being activated when based on the comparison a second activation threshold value is reached and being deactivated when based on the comparison a second deactivation value is reached, wherein a current infeed from the domestic mains supply is used to charge the electric vehicle until the first activation threshold is reached or exceeded.