The controller we use is an intelligent waterproof controller, which is composed of a light controller and a time controller. After it is installed and set up, no man-made operation is needed. The control function in the solar lighting system is equal to people’s brain, which is connected with solar panels absorbing sunlight, storage batteries for storing energy and the lamp of lighting. When it senses the voltage of the solar panel dropping down to a certain level, it will automatically turn on the circuit of the lamp. And when the set working hours of lighting is ended, it will turn off the light automatically. Besides the function of intelligent light control switching-on and switching-off, such an intelligent controller has many other functions, such as prevent the battery from overcharge or over-discharge.