System to recharge an accumulator of electric energy of an electric vehicle, comprising: - a first converter unit having a first voltage and at least a second converter unit having a second voltage, - a first electrical circuit connecting the first converter unit and the accumulator, to recharge the accumulator with the first converter unit, - a second electrical circuit connecting the second converter unit and the accumulator, to recharge the accumulator with the second converter unit, the first converter unit and the second converter unit being galvanically isolated; the first converter unit and the second converter unit being included in a charging power station; characterized by: - a switch connected to the first converter unit and to the second converter unit, and adapted to connect in series the first converter unit and the second converter unit and to form a third electrical circuit connecting in series the first and second converter units with the accumulator, to recharge the accumulator with the first converter unit and the second connected unit in series,: - a first diode between the accumulator and the first converter unit on said first electrical circuit, an end of the first diode being connected to the connection of the switch with the first converter unit and an opposite end being connected to one of the accumulator terminal, to prevent a current flow from the accumulator to the first converter unit on the first electrical circuit, - a second diode between the accumulator and the second converter unit on said second electrical circuit, an end of the second diode being connected to the connection of the switch with the second converter unit and an opposite end being connected the other accumulator terminal, to prevent a current flow from the accumulator to the second converter unit on the second electrical circuit, - a controller of the switch adapted to detect a voltage of the accumulator, and adapted to open the switch (switch off) and to recharge the accumulator with one of the first or the second converter units (3, 4) on said first and second electrical circuit (8, 9), or with both the first and the second converter units (3, 4) in parallel, if a voltage (V3+V4) of the first and second converter units (3, 4) connected in series is not compatible with the voltage of the accumulator, or close the switch (switch on) and to recharge the accumulator with the first and second converter units (3, 4) in series on said third electrical circuit or to provide current from the accumulator to the first and the second converter units (3, 4), if said voltage of the accumulator is compatible with the voltage (V3+V4) of the first and second converter units (3, 4) connected in series - a first converter unit having a first voltage and at least a second converter unit having a second voltage, - a first electrical circuit connecting the first converter unit and the accumulator, to recharge the accumulator with the first converter unit, - a second electrical circuit connecting the second converter unit and the accumulator, to recharge the accumulator with the second converter unit, - a switch connected to the first converter unit and to the second converter unit, and adapted to connect in series the first converter unit and the second converter unit and to form a third electrical circuit connecting in series the first and second converter units with the accumulator, to recharge the accumulator with the first converter unit and the second connected unit in series,: - a first diode between the accumulator and the first converter unit on said first electrical circuit, an end of the first diode being connected to the connection of the switch with the first converter unit and an opposite end being connected to one of the accumulator terminal, to prevent a current flow from the accumulator to the first converter unit on the first electrical circuit, - a second diode between the accumulator and the second converter unit on said second electrical circuit, an end of the second diode being connected to the connection of the switch with the second converter unit and an opposite end being connected the other accumulator terminal, to prevent a current flow from the accumulator to the second converter unit on the second electrical circuit, - a controller of the switch adapted to detect a voltage of the accumulator, and adapted to open the switch (switch off) and to recharge the accumulator with one of the first or the second converter units (3, 4) on said first and second electrical circuit (8, 9), or with both the first and the second converter units (3, 4) in parallel, if a voltage (V3+V4) of the first and second converter units (3, 4) connected in series is not compatible with the voltage of the accumulator, or close the switch (switch on) and to recharge the accumulator with the first and second converter units (3, 4) in series on said third electrical circuit or to provide current from the accumulator to the first and the second converter units (3, 4), if said voltage of the accumulator is compatible with the voltage (V3+V4) of the first and second converter units (3, 4) connected in series