When we talk about the city at night, street lights on the road are an integral part. In recent years, the concept of green environmental protection has been increasingly popular among the public, and solar-powered street lights have attracted much attention. In order to ensure that these street lights can reliably illuminate the road at night, we need to consider several important parameters including the wattage of the street lights, photovoltaic panel power, battery capacity and controller stability. The design and configuration of solar street light system are key factors. It is related to whether the road can be illuminated reasonably and permanently
Why we should pay attention to the parameters of solar street light
The solar panels are related to the energy collection capacity, that is, how long it takes to fully charge the battery with effective sunlight. The LiFePO4 battery capacity should be related to whether the street light can be continuously driven during night lighting. These parameters and components of solar street lighting systems, if configured unreasonably, will affect the normal operation of solar street lighting systems. For example, If the solar panel & battery capacity is too small, the street lights may not be able to meet energy needs at night, etc. On the contrary, a deep understanding of these parameters can help create efficient, rational and sustainable solar street light systems that provide reliable urban lighting
Calculate total watt-hours per day for street lig
The total watt-hours is the electrical energy consumed by solar street lighting system every day, which directly affects the capacity of the battery and the power selection of the solar panel. To calculate the daily energy consumption (total watt-hours) of a street light, you need to know two main factors: the wattage of the fixture during different time periods and the number of operating hours during each time period. The formula for calculating the total watt-hours per day is as follows: Total watt-hours per day = Electricity consumption 1 (W) × Number of working hours in the different time period. For example, assuming a street light with a wattage of 100W street light works 12 hours a day, with the first 5 hours working at 100% power and the last 7 hours working at 50% power, then the total daily watt-hours are calculated as follows: Total daily watt hours = 100W × 5 hours + 50W × 7 hours = 850 watt hours (Wh). The calculation results can be used in the following sections to determine the battery capacity and solar panel power required for the solar street light.
Battery of solar street lighting systems – capacity
The recommended battery type for use in solar photovoltaic systems is deep cycle batteries. Deep cycle batteries are designed for rapid charging after being discharged to low energy levels or for continuous charging and discharging for many years. The battery should be large enough to store enough energy to run the LED street light at night and on cloudy days. Solar street lighting systems usually use lithium batteries (LiFePO4). It has relatively long life, good safety, and high
Calculate the total watt hours used by the light fixture per day. Calculate the system’s conversion efficiency as 95% Calculate the depth of discharge of the battery. lithium batteries are calculated as 95% Calculate the number of autonomous operation days (that is, the number of days the system needs to operate without photovoltaic panels to generate electricity) Required battery capacity (Wh) = Total Watt-hours (per day) x Days of autonomy / 0.95 / Depth of discharge of deep cycle battery
E-LITE case study of solar street lighting systems
Currently, our customer is working on a solar street light project. The customer requires to use of 115W solar street lights, which do not require sensors and use PWM dimming, but need to set time period dimming. The specific period-based work is as follows: the first period is 100% and continues to work for 5 hours; the second period is 50% and continues to work for 7 hours; where there is only required one night lighting. Sunshine Time(Charging.
The road condition is 8 meters wide, with sidewalks of 1.5 meters on both sides. The height of the light pole is 10 meters, the length of the cantilever is 1 meter, and the distance between the light pole and the curb is 36 meters, which meets the requirements of M2 lighting level. According to the lighting simulation results of E-LITE, it is shown that the 115W Omni series is very suitable.、
Watt-hours of
Based on the project conditions, we calculated the actual power consumption as follows:
Total street light use = (115W x 5 hours) + (57.5W x 7 hours) = 977.5Wh/day
Capacity of
Depending on the project situation, since the number of working time is for one night only. We then translate this energy requiremen
battery capacity, taking into account the voltage of our battery system is 25.6V
Battery capacity = Total street light use 977.5WH×(0+1)/25.6V/95%/95%=42.3AH
Conclusion: The battery capacity is: 25.6V/42A
(the capacity of a single battery cell is 6AH,so 42.3AH is rounded to 42AH
Wattage of the
1、The minimum power generation capacity of the battery panel per day (the battery will be fully charged in one day-6hrs)
25.6x42AH=1075.2WH
2、Minimum power generation current of battery panel
1075.6WH/6H=179.2W 3、System conversion efficiency 95%
179.2W/95%=188.63
Based on the results, we can choose to install 1pc 36V/190W (99% safety charging factor reserved) solar panel module to meet the energy needs of the project.
E-Lite Semiconductor, Co.,L
Web:www.elitesemicon.com
Att: Jason, M: +86 188 2828 6679
Add: No.507,4th Gang Bei Road, Modern Industrial Park North
Chengdu 611731 China.
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Post time: Sep-03-2024
