The development of electric vehicles (EV) during the last 10 years has made a major contribution to the growth of the automotive sector. The technique that is used to charge the batteries of electric cars will have a major impact on their development. When the battery of an electric vehicle is charged from the grid, there is an increase in the load demand for that grid. As a consequence of this fact, the authors of this research propose an off-board method for charging the batteries of electric vehicles that is founded on photovoltaic (PV) arrays. The battery of the electric car has to be constantly charged, and this is true regardless of the quantity of available sunshine. The EV battery may be charged by the system that has been designed both during the daytime hours and during the hours in which there is no sunlight due to the SEPIC converter and the three-phase bidirectional DC–DC converter. Both of these converters are capable of helping the system. When there is an abundance of sunshine, both the electric vehicle’s battery as well as the backup battery are concurrently charged, and when there is an absence of sunlight, the EV battery is charged with the assistance of the backup battery. In order to do simulations of the proposed charging system, the MATLAB software, which comes packaged with a programme called Simulink, is used.