Unmanned Aerial Vehicle (UAV), or commonly known as drone, is a type of aircraft without a human pilot on board, as the name suggested, but controlled autonomously by computers and/or taking commands from remote stations. The UAVs are perfect candidates for tasks that are tedious or dangerous for human, for example, patrolling along boarder lines, wild fire control, aerial surveillance and etc. The applications of UAV, as described above, generally require long flight time and reliable power supply. However, current UAV designs utilizing traditional battery or fuel cells usually struggles to meet such requirement. This project aims to provide an innovative solution to this problem by introducing the current popular photovoltaic system into the UAV power system design. It focuses on the electrical system design and the product will be a platform for future development on solar powered UAVs. The UAV has a vast variety of configurations. The type of UAV chosen for this project is quadrotor helicopter, or called quadcopter, for its benefit as being easy to configure and having space for solar panel placement A working power management system is designed, fabricated and tested in this project. Such power management system is able to prolong the flight time of quadcopter, as opposed to that with only battery on board.