What are the reasons why solar street lights are on during the day?

Nowadays, solar street lights are installed in urban areas. Solar street lights not only bring light to people at night, but also dress up the night of the city. However, some solar street lights are on during the day, which not only wastes energy but also cannot work normally at night. So what is the reason why solar street lights are on during the day? Next, the editor of Century Sunshine Lighting will give you a detailed introduction.

1. Solar panels convert sunlight energy into electrical energy. The stronger the light, the weaker the light, the lower the output light. The output voltage of the solar panel can be used as a basis to turn on the street light when the voltage is lower than a certain level, and turn off the street light when the voltage is higher than a certain level.

2. Object cover If the solar panel is covered, it will also cause the solar street light to not work normally, such as heavy snow cover and dust cover. When these covers cover the solar panel, the output voltage of the solar panel will be lower than a certain value, and the solar street light will be triggered to light up.

3. The solar street light controller displays under voltage status, and the light will not be on after dark, but the battery voltage has exceeded the under voltage value, indicating that the battery has power. After the battery drops to this voltage point, the controller turns off the power supply and stops discharging, mainly to protect the battery from being over-discharged and affecting the subsequent use of the entire device. The charging voltage will only continue to discharge when it is charged to 24V (controller default value). The main purpose of this setting is to prevent the battery from being damaged by long-term deep discharge. In the case of under voltage of the battery, if the solar street light controller is not restarted, 22.2 volts to 24 volts are all under voltage states. Only when the solar street light battery voltage is charged to more than 24 volts will it continue to discharge.

4. Photoresistors are particularly sensitive to light. When the light intensity is weak, the resistance is large. As the light becomes stronger, the resistance value decreases. A balance point can be found by sliding the rheostat. When the light is strong, the photoresistance value is small. Using photoresistors has certain disadvantages. Photoresistors have high installation requirements and are prone to miscontrol in rainy and cloudy days.

The above reasons for the solar street lights to be on during the day are shared here. In addition, there is another less likely reason. In rainy weather, the solar panels absorb insufficient solar radiation and emit weak power. The controller will think it is dark and will automatically turn on the lights.