Solar light is made up of four main components, namely solar panels (photovoltaic), batteries, light sensors, and control electronics. During the day, photovoltaic cells absorb the sunlight and store it in batteries. This stored energy is converted into electrical energy. Batteries should. After learning how do solar lights turn on at night, let's also see whether solar lights automatically turn off in the morning. Photosensors detect. Sometimes it happens that the sun is on its head and solar lights are still on. It means that the photo sensors are not working properly. How do solar lights turn on at night without any direct sunlight? Yes, direct sunlight is a good and fast way to charge solar light. They need sunlight to hit the panel for the cell to charge. Different types of photo sensors are used for solar lights. The most common photo sensors used in solar lights are as follows: a) Light Sensors: It is a simple sensor that senses the absence.