Practical applications of solar street lights and batteries

With the increasing shortage of traditional energy sources, the application of solar energy will become more and more extensive. In particular, the field of solar power has developed into a mature sunrise industry in a short period of time.

1: Currently, one of the most important factors restricting the application of solar power generation is the price. Take a two-way solar street lamp as an example. The total load of the two roads is 80 watts. (Effective light 4.5h/day and night in the middle and lower reaches of the Yangtze River. Discharge 8h, increase the battery board 20% reservation amount calculation) its battery board will need about 250W, according to 30 yuan per watt, the cost of the battery board will be 7500 yuan, plus about 250AH battery pack costs are also about 2500 The one-time investment cost of the entire street lamp is much higher than that of the city circuit lamp, causing a major bottleneck in the application of solar street lights.

2: The battery life should also be considered in the application of the entire street light system, the general battery warranty for three or five years, but the general battery in one year or even six months later will appear to be dissatisfied with the charge, some of the actual charge rate It may drop to about 50%, which will definitely affect the normal lighting at night during continuous rainy days, so it is particularly important to choose a better battery.

3: Some engineering companies often use LED lights as the lighting of solar street lamps, but the quality of LED lights is not uniform, and the light failure of serious LED can attenuate 50% of the illumination for half a year. Therefore, we must choose LED light with slower light decay, or use non-polar light, low pressure sodium light and so on.

4: The controller selection is often a problem that is neglected by the engineering company. The quality of the controller is uneven. The market price of the 12V/10A controller is between 100-200 yuan, which is the lowest value in the entire street lighting system. Partly, but it is a very important part. The quality of the controller has a direct impact on the component lifespan of the solar street lighting system and the procurement cost of the entire system. One: The controller with lower power consumption should be selected. The controller operates 24 hours a day. If the power consumption of the controller is high, the controller will consume more power. Consuming part of the energy; Second: To select a controller with high charging efficiency, the controller with MCP charging mode can automatically track the maximum current of the battery board, especially in the winter or during the period when the light is insufficient, the MCP charging mode is about 20% higher than others. s efficiency. Three: The controller with two-way power adjustment should be selected. The controller with power adjustment has been widely promoted. One or two lights can be automatically turned off during the rare pedestrians at night, which saves electricity and can also be used to power LED lamps. adjust. In addition to selecting the above power-saving features, the controller should also focus on the protection functions of the battery and other components. A controller with a trickle charge mode can protect the battery and increase the battery life.

5: The distance from the urban areas should also pay attention to anti-theft work, many construction companies because of construction negligence, there is no effective anti-theft, resulting in battery and other components stolen, not only affects the normal lighting, but also caused unnecessary property damage.

6: In many practical applications of solar street lamps, solar street lamps in many places can not meet the normal lighting needs, especially in the rainy days, in addition to the selection of poor quality related components, the other main reason is to blindly reduce the cost of components, Design and configuration are not in accordance with requirements, and the standards for use of battery panels and batteries are reduced. As a result, street lamps cannot provide illumination during rainy days.

The following provides formulas for calculating the solar panel and battery configuration:

One: first calculate the current: such as: 12V battery system; 40W lamp 2, a total of 80 watts. Current = 80W ÷ 12V = 6.67A

Two: Calculate the battery capacity requirement: For example: The cumulative lighting time of the street lamp needs to be 7 hours full load (h); need to meet the lighting needs of continuous rainy days 5 days. Battery = 6.67A × 7h × 5 days = 6.67A × 35h = 233.45AH

Three: Calculate the peak demand of the panel (WP): The cumulative lighting time of the streetlight needs to be 7 hours per hour (h);

★: The panel receives an average of 4.5 hours per day (h) of effective light; at least, it relaxes 20% of the panel's demand. WP÷17.4=(6.67A×7h×120%)÷4.5hWP÷17.4=12.45WP=216.63(W)

★: The daily illumination time of 4.5h is the sunshine coefficient near the middle and lower reaches of the Yangtze River.

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