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How to Calculate Battery Capacity of All In One Led Solar Street Light?

2021-06-10

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Many people would wonder how all in one led solar street light provide illumination in the night? The electricity of the street light comes from the solar rechargeable battery. To make you clearer, we had to mention the working principle of the all in one led solar street light. The solar street light consists of controller, solar panel, battery, lighting fixture, light pole, etc. In the day, the solar panel will absorb the solar energy and store the energy in the battery. When it comes to night, the battery will provide electricity to the lighting system under the command of controller.

all in one led solar street light


Reasonable configuration of all in one led solar street light will save the cost of users and make the light last longer. If you don’t know how to configure your all in one led solar street light, keep on reading. You need to know how bright you need the light to be and how long you need it to light up. Various factors need to be considered when calculating the capacity of the solar street light battery.


  • Power of all in one led solar street lights

  • Consecutive rainy days

  • Lighting hours per day


First, we need to calculate the watt-hours

Watt-hours= Light power * lighting hours

Then, we can calculate the ampere-hour. 

Ampere-hour=Watt-hours/voltage

As we all know, we can’t discharge the battery totally. 90% would be the maximum discharge. 

Battery requirement= Ampere-hour/90%

Consecutive rainy days is also one of the important factors.

Battery capacity=Battery requirement* consecutive rainy days


Let's take EXC-CR-Z01-20 all in one led solar street light as an example. This model have PIR motion sensor. Normally our lamp keep 20% dim brightness, When one person passed by the light, the lamp will keep full brightness in 30s. If we assume that 120 people passed by per day, then the lamp will keep full brightness for 1 hour per day. The lamp power is 20W, battery voltage is 12.8V. The lamp keep 10 hours brightness per day., and the consecutive rainy days is 3. 


High brightness 1 hours  output: 20W*1 h=20Wh

20% Dim brightness 8.5 hours  output: 20W*8.5h* 20%=34 Wh

The lamp need output energy in one day: (20WH+34WH)/12.8V= 4.2 Ah

Battery requirement= 4.2Ah/90%=4.7Ah

Battery capacity=4.7Ah*3=14Ah



Battery is the most significant part of all in one led solar street lights components. Reasonable configuration of the solar street light will help you a lot. Shenzhen EXC-LED Technology Co., Ltd. is the leading solar led street light manufacturer in China with more than 10 years of experience. If you are still confused about the configuration of the all in one led solar street light, please consult us.


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