How to Calculate Solar Power in Solar Powered Led Street Light?

As the country vigorously promotes green energy conservation, the application of solar energy resources has entered people's attention. Solar powered led street light is a successful example of the application of solar energy resources. Solar powered led street lights are mainly powered by solar energy, and are composed of solar panels, controllers, batteries and light sources and other accessories. EXC is the leading solar powered led street light manufacturer, and its products are exported to more than 40 countries and regions, becoming the leading brand in the global solar powered LED street light industry.

Next, let's talk about how to calculate solar power in the solar street lighting system.

First of all, we need to determine a few points: the full-power lighting hours per day; the number of consecutive cloudy and rainy days; the number of sunshine hours at the installation site; the power of the lamps; road conditions, assuming that the lights are turned on for 12 hours a day, the first four hours are full power, the middle half of the power for four hours, and 25% power for the next four hours. The full power lighting time per day = 4+4*0.5+4*0.25=6 hours, set the number of continuous 5 rainy days, because the battery panel will also charging, so it can be set to not charge, the street light can be continuously lit for 4 days.

Peak sunshine hours ≠ local sunshine hours, peak sunshine hours are much less than sunshine hours, and this peak sunshine hours can not simply take the average of one year, we should test the peak sunshine hours around the winter solstice of one year, then How to measure it? First, you take a 100W monocrystalline solar panel, be sure to wipe it clean, fix it on the bracket, and connect it to a battery system (guarantee that it will not be fully charged in one day).

Start the test after turning off the lights before sunrise. The battery panel charging voltage and charging current are tested every 10 minutes (the shorter the interval, the better), until the battery panel is no longer charged after sunset, and the voltage tested from morning to night* Current *10min=100W*60*X, so that the value of x can be determined to determine the peak sunshine hours on the winter solstice. The theoretical peak sunshine hours in Jinan is 4.44H, which is basically the same at the same latitude. This data is used in Shandong, China.

To determine the power of the lamp, it is first necessary to make it clear that the lighting effect of the LED is more than 2.5 times that of the high-pressure sodium lamp, so we must abandon the previous concept that the greater the power, the better, and the power of the LED is reasonably determined. In general urban arterial roads, when the light distribution is good, 10M light pole 90W-120W is sufficient, secondary arterial road 8M light pole 60W light source, and rural roads generally 30W-50W.

Now that the above information is known, an actual calculation will be carried out below. Suppose a place requires solar powered led street lights with a power of 40W, full power work for 5 hours per night, continuous 5 rainy days, local peak sunshine hours of 4 hours, a 12V battery system, and light air pollution: first determine every day The power consumption at night is 40W*5H=200WH, and it needs to consume 1000WH for 5 rainy days. The power needs to be fully charged within two days when the power is used up. The power of the battery panel should be 1000WH/10H*0.85=117.64WP, 0.85 Is the charging efficiency of the battery. Due to the degradation of the power generation efficiency of the solar panels and the influence of local dust, the power of the solar panels needs to be increased by 40%. Then the power of the battery panel should be 165WP. In determining the battery capacity, the discharge depth of the lithium battery is generally about 0.8, and the battery system is a 12V system, then the battery capacity can be determined as 1000WH/12V/0.8=104.0AH. Due to the influence of winter and spring temperature and other factors on the battery, it is necessary to increase the battery capacity by 20% to ensure the normal lighting of the system during the winter solstice. Therefore, the capacity of the battery is 124.8AH, which results in the capacity of the solar panel.