Professional analysis of the working principle of solar street lights

The solar street lamp is composed of solar cell components including bracket, LED lamp holder, controller, battery and lamp pole in the control box. The light efficiency of the solar cell panel reaches 127Wp/m2. The higher power is very beneficial to the wind resistance planning of the system. 1W white light LED and 1W yellow light LED are integrated on the printed circuit board and arranged in a certain distance dot matrix as a plane light source. The operating principle is introduced. The solar cell made by the photovoltaic effect principle during the day receives solar radiation energy and converts it into electrical energy. The output is stored in the battery through the charge and discharge controller. At night, when the illuminance gradually drops to about 10lux, the solar panel opens. The charge and discharge controller with a voltage of about 4.5V detects this voltage and then activates the battery to discharge the lamp cap. After the battery is discharged for 8.5 hours, the charge and discharge controller will act, and the battery will be discharged. The primary function of the charge and discharge controller is to maintain the battery. Compared with general solar lighting, the planning of solar street lights has the same basic principles, but there are more links that need to be considered. The following will analyze the following aspects of LED high-power street lights. Requirements for solar cell module selection and planning 1. Load input voltage 24V, power consumption 34.5W, working hours per day, 8.5h. Ensure 7 consecutive cloudy and rainy days. The average annual radiation in the past two decades is 107.7Kcal/cm2. After a brief calculation, the peak sunshine hours in this area is about 3.424h. The minimum total power of solar modules u003d 17.2×5.9u003d102W. Choose the peak output power of 110Wp and a single unit of 55Wp. Standard battery components should be able to ensure the normal operation of the street lighting system in most cases of a year. The calculation of battery capacity planning is simpler than the peak wattage of solar modules. According to the above calculation, the daily power consumption of the load is 12.2AH. In the case of battery overflow, it can work 7 consecutive cloudy and rainy days, plus the battery capacity of the first night.