How to calculate the configuration of solar street lights? Since solar street lights rely on the sun to generate electricity, we need to know how to calculate. I will start with how much electricity solar street lights use each night. Only by knowing the electricity consumption each night can we calculate how much electricity needs to be generated each day.
Case: In the process of constructing beautiful rural areas in the middle and lower reaches of the Yangtze River (with peak sunshine of 4H), a 30W LED light source was installed and lit for 7 hours every night, ensuring normal lighting for 3-4 rainy days; Let's first calculate the required power consumption for this configuration: a 30W LED light source, on a solar street lamp, and a normal 12V system. From this, we can determine the current size of 30W, with 30W/12V=2.5A. Currently, the power consumption per night is 2.5A * 7H=17.5AH; If there is no sun to ensure normal lighting for 3 to 4 rainy days, the size of the battery is 17.5AH * 4=70AH; However, due to the existence of overcharge and overdischarge protection in solar street light batteries, the normal charging depth and discharge depth of solar street light batteries are 90% and 70%, which means that the 70AH configuration accounts for 70% of the total configuration, and the true capacity of the battery is 70AH/0.7=100AH;
In order to meet the daily electricity consumption, the solar panel must generate more than or equal to the electricity consumption. We assume that the wattage of the solar panel is X, X/17.5V (17.5V represents the working voltage of the 12V solar panel)=working current, and X/17.5V * 4H (effective lighting time)=17.5AH. Therefore, we can infer that the required size of the solar panel is X=76.56W; However, due to the presence of line loss and controller loss in the solar street light system, the normal loss is around 5% -25%. That is to say, during the process of configuring the battery panel, the normal calculation is based on a loss of 20%. It can be inferred that the true size of the battery panel X is X=76.56W * (1+0.2)=92W; The configuration of the solar controller has a discharge current of 2.5A for 30W LED and a charging current of 92W/17.5V=5.2A; So when choosing a controller, you can choose one within 10A. The 3A controller of Kaiyuan Lighting Group has a power generation current of 5A and a charging current of 10A, which is more suitable. If you configure a 10A controller, it is not necessary to have such a large current. The current of the controller only needs to exceed that of the power generation and charging, so the larger the better in the process of configuring the controller.
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