This paper presents a medium-voltage (MV) (12.47 kV), 350 kW electric vehicle (EV) fast charger using 10 kV SiC MOSFETs. Detailed system design procedure based on the 10 kV SiC MOSFET characterization is presented to provide a guide on the 10 kV SiC MOSFET converter development. Taking the advantage of the 10 kV SiC MOSFET s high voltage blocking capability and efficient switching performance, a single module high power density system is designed with the DC/DC stage operates at 25 kHz and the simulated system efficiency exceeds 98%, input current THD lower than 2%. With all the passive components selected, the designed system power density is 1.6 kW/L.