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This paper proposes an improved Maximum Power Point Tracking method and design methods of unmanned solar vehicle system by

parts of hardware, unmanned driving control and power conversion. The hardware design is offered on the weight reduction and

structural reliability by using structural analysis software. The technique of curve fitting is applied to unmanned control system due to

minimizing the vehicle’s behavior. Furthermore, lateral controller applying actuator dynamics is robust enough to prevent performance

degradation by measurement noise regarding position and heading angle. The power conversion system contains battery charger

system and tapped-inductor boost converter. In the battery charger system, variable step-size MPPT is conducted for quick response

of maximum power point tracking. The validity of the proposed algorithm are verified by simulations and experiments.