The solar street light is a lighting device that uses solar energy to produce electricity. It can provide lighting function at night. In order to ensure that the solar street lights can last more than 10 hours, we must be equipped with appropriate sized panels and batteries.
First of all, we need to consider the energy requirements of solar street lights. Generally speaking, the power of solar street lights is between 10 watts and 100 watts. Suppose we choose a 50 watt solar street light, then we need to calculate the energy it consumes per hour.
The energy consumed by a 50 watt per hour solar street light is 50 watts times 1 hour, or 50 watt hours (Wh).
Next, we need to consider the power generation capacity of the solar panel. The electricity production capacity of solar panels depends on the intensity of solar radiation and the efficiency of thepanels. Generally speaking, the efficiency of solar panels is between 15 and 20%. Suppose we choose a solar panel with an efficiency of 18%, then we need to calculate the energy it generates per hour.
The energy generated by a solar panel per hour is equal to the intensity of solar radiation multiplied by the surface area of the panel multiplied by the efficiency. Assuming that the solar radiation intensity is 1,000 watts per square meter and the panel area is 1 square meter, the energy generated by the solar panel per hour is 1,000 watts times 1 square meter times 18 %, or 180 watt hours (Wh).
Finally, we need to take into account the battery capacity. The battery capacity depends on the energy generated by the solar panel per hour and the energy consumed by the solar street light per hour. In order to ensure that the solar street light can last more than 10 hours, we need to choose a batterye of a capacity greater than or equal to the energy consumption of the solar street lamp per hour multiplied by 10.
According to the previous calculation, the energy consumed by solar street lamps per hour is 50 watt hours (Wh) , the capacity of the battery must therefore be greater than or equal to 50 watt hours multiplied by 10, or 500 watt hours (Wh).
In summary, in order to ensure that the solar street light can last more than 10 hours, we must be equipped with a solar panel with a power of 50 watts and a battery with a capacity of 500 watt hours. This way, solar street lights can provide continuous lighting at night.