How to achieve 100% solar street lighting throughout the year
Yu summary of the source of solar PV Co., Ltd.
Main issues: the current most solar lights on the market: (1) source of long-term continuous light rain leaving insufficient or failure to maintain lighting, (2) Battery: Long-term continuous use, shortening the life span and improve the overall business needs Total costs (maintenance, replacement costs). Solar lights work: solar panels generated electricity stored in batteries, and then consumed by the lamp. As the amount of solar radiation throughout the year different, so the amount of solar panels generating a corresponding different. Therefore, the technology and configuration needs of the dynamic design of integrated systems to achieve 100% of the year, solar street lighting, the key technology to realize 100% of the year. Solar street lighting is adjusted with changes in battery capacity lamp's electricity consumption. Keywords: solar street lighting, lighting 100% throughout the year, power conditioning
1, describes the current solar lamps in China industry:
According to the trend of energy saving, and many pilot projects have been implemented for all in China. However, since many local governments into doubt the quality and result of these tests are caused by the poor quality, low reliability, system design inappropriate, due to the high cost of solar lights. This suspicion is increasingly becoming the solar lights and solar lights industry's healthy development, universal obstacles. Statistics show that 83% of the solar street lights to be installed in the Beijing city within a year in 2008 to replace its battery lights. Jiangxi Province in the other case, the "1000 solar street lights be installed on the end of 2008, after 3 rain in March 2009, only 3 lights are still working. In addition to possible improper installation, the above situation, mainly because many solar lights different suppliers to purchase parts directly to do simple assembly, rather than investing in research and development, professional design, manufacturing, and other self-made and issued. We hope that local governments and contractors check before buying the professional supplier of solar lights (large does not mean the de facto professional) intellectual property and key technology suppliers, the sample should be installed and tested to check the quality, performance, reliability and so on.
2, peak power select solar panels
The distribution of solar radiation levels are also different, even in different months of the year, with the location change. 30 years of EAI (effective temperature sunshine) records show that our total annual solar radiation in Lhasa (Tibet) than Chengdu (Sichuan) and more than 2.2 times. Harbin City in June, although the average daily solar radiation was 12 months 5 times. In the calculation of the solar panels of the peak power, we need to know the daily average in the installation location of solar panels tilted surface solar radiation levels: HT = ṛ × high serotonin, out of the tilted surface solar radiation levels of R - Monthly inclined plane on the average level of solar radiation / monthly average solar radiation level of the surface of the horizontal total solar radiation levels ħ
The above formula, easy to understand the purpose, the actual calculation is more complicated than this. The key question is how to select the reference level of the horizontal solar radiation and solar panel tilt angle. Usually for the local latitude angle degrees ± 5%, according to the project experience. Although the level of solar radiation must be consistent with the reference value of total annual generating capacity of the break-even point. If the reference value chosen is too low, natural lighting, solar street light time requirements will be easier to achieve, but the power of solar panels will have the necessary cost will be higher than the corresponding greater. If the reference value chosen is too high, then it will be difficult to meet the requirements of solar street lighting time, the solar lights will be affected, while, in this case, the battery in the long run to work under low power, which will lead short life, we must increase the cost of frequent battery replacement. Based on our experience of 9 years of the project, cost performance and battery life when the break-even point will be the best choice to ensure that 85-90% of the time the normal lighting and illumination reduced, 10-15% of the time left in office (winter rainfall season, etc.).
3, the battery capacity choice
Now widely used lead-acid batteries using solar lights. The following curve shows that between the deep-cycle emissions of the depth and time relationships.
SW100, SW200 Series Battery: When the discharge depth of "30%, and longer battery life (more in-depth cycle). At the same time, the curve of the conditions on the basis of the charge capacity is 130% of the discharge capacity of the solar the application of false lights, so the depth of discharge the battery every day must be designed to "30%. Based on our years of experience in project, should be 13.5-16% depth of discharge, the following calculation: Ah Q / V.ρ A: battery capacity; Q: Daily lamp power consumption; five: system voltage, ρ: the depth of discharge 4, the actual results to adjust the lamp power consumption and battery capacity
Assumptions: it began to rain before the battery capacity is full, the battery capacity of the design work 6 nights, 5% of the normal charge capacity can be achieved in the rainy days, consecutive rainy days 8. If the lamp power adjustment will be the same, the battery is empty, the first 7 days and 8 days of light will not work, and if the ratio of lamp power consumption and battery capacity to adjust to change, 8 days, the battery remaining 50% of capacity, which is an important basis for maintaining long-term continuous rain the sun operations; while maintaining the long-term high-capacity battery to extend its life. Therefore, adjusting the lamp power, the battery capacity and key technologies to ensure 100% of the year, solar street lighting. The technique (a type of LED lighting, energy storage device) has been the source of solar PV Co., Ltd. Yu realized, has been China's national patent (Patent No.: ZL 2007 1 0031050.6, the new utility model patent registration number.: ZL2007 2 0058679.1). The main features of this technology:
A, the use of SFC Smart LED driver module (power: 0.0625W), to replace the conventional constant current drive (the total power consumption 15-10%), savings of 15-20% of the electricity.
B, the use of FM switch technology, coupled with persistence of vision effect (25 frames / sec), save 50% power than LED constant current drive technology, visual brightness drop is not obvious.
SPC generated output power regulation modules, power saving mode after midnight classification, saving the "20% of the energy consumption. Finally, the source of solar lights Yu patent, save 70% -90% of the power consumption of the same configuration than the average solar street light . solar lights, often rainy season is usually 2-7 days, and the buildings and the source of solar lights for 35-50 consecutive rainy-day maximum. Thus, the source of solar lights yu do not use as a supplement to achieve full-year 100% of the power cord electricity for lighting. Of course, accurate system configuration, professional design and high quality raw material selection is also important.
Conclusion: The above description and analysis show that the promotion of solar lights bottleneck has been broken. We will cherish the opportunity to discuss with their peers, experts, and jointly promote the development of solar energy industry, promote energy conservation.
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