Recognize the growing shortage of traditional energy, green new energy solar applications will be more and more widely.
1, Currently, The price is one of the most important part to restrict solar energy application . A two-way solar spotlight, for example, two-way load 60 watts, (effective light in the Yangtze River region 3.5-4.5h / 7 hours per night to increase the battery board 20% reserve calculation) which panels need about 160W , according to RMB 30 yuan/W, the cost of panels will be RMB 4,800 yuan, plus about 180AH cost of the battery pack also Close to RMB 1800. the cost of the entire street one-time input is much higher than the Grid Power lights, resulting in a major bottleneck in the field of solar street lighting applications.
2, The battery lifespan should also be considered in the entire street light applications system. The general battery warranty are about three or five years, but the average battery in a year, or even six months later there will be unfulled charging, some of the actual charge rate May fall to about 50%, which will affect the normal lighting during continuous rainy days at night, so to choose a better battery is particularly important.
3, As the LED light lifespan is longer, and can be reduced low power work by night time. The general project will use LED lights as solar lights to lighting. However, the quality of LED lights are uneven, light fades serious LED may be 50% light attenuation half a year. So be sure to choose the slowly decline of LED lights. The most important thing of LED lights need to do are cooling and constant current problems. Constant current can be added by constant current driving or use controller; cooling must rely on aluminum to heat disspation, It is the best to add copper sheet or copper pipe under the aluminum plate for more effective heat disspation, good controlling of temperature will be longer for LED life.
4, It is often a problem of overlooked by the engineering to the controller.Controller quality are also uneven, 12V / 10A controllers which market price are RMB 100-200. Although it is the smallest value Part of the entire street light system ,it is a very important part. The quality of controller directly affects the component lifespan of solar street light system and the procurement cost of whole system.
(1) Should choose a lower power consumption controller. The controllers work 24 hours without interruption, If big power consumption, it will consume part of power, the best controller below 5 mA power consumption .
(2) To select a controller with high charge efficiency, the controller with MCT charging mode can automatically track the maximum current of the panel, especially in the winter or low light period, MCT charging mode efficiency is about 20% higher than other.
(3) Should select the controller with power regulation, this controller has been widely promoted, can be in the pedestrian rare hours automatically lower LED lamp operating current, saving electricity, but also saves the battery board configuration proportion. In addition to the above-mentioned power-saving features, it also need to focus on protection function of controller battery and other components. Like a trickle charge mode controller can protect the battery, increase battery life; and when setting the controller under-voltage protection, as far as possible to adjust the undervoltage protection value above 11.1V, to prevent the battery over-discharge, battery overcharge, over discharge will reduce the service life.
5, Distance from the urban areas should also pay attention to anti-theft. Many construction companies because of negligence, there is no effective anti-theft, resulting in batteries, battery panels and other components stolen, not only affects the normal lighting, but also caused unnecessary property loss. Currently, stolen project mostly are batteries and battery panels. Batteries buried in the ground with cement pouring is an effective anti-theft measures, and can play a role in temperature. The best Installed battery in the poles on box to be welded reinforcement,morever if battery far from the controller must be added with the temperature sensor line, or the controller can not detect the temperature of battery ,or can not give the relevant temperature compensation. Mainly stolen solar panels due to lower pole or around pole have climbing objects, so the height of the best design poles are more than 5M.
6, Controller waterproof. Most controller installed in the shade, battery box. The general will not water, but in the actual case of some improper installation because of some controller circuit board did not do three anti-paint treatment, Will be short-circuited because the rain water flows into the controller along the external wiring of the terminal.So in the construction should be noted that the controller terminal internal connection line bent into "U" shaped and solid type, exposed in external connection is also fixed as "U" type, so that rain can not be poured into the controller and short circuit, Can also be applied to the inside and outside line interface waterproof glue to waterproof.
7, In many practical applications of LED solar lights outdoor, in many places can not meet the needs of normal lighting, especially in continuous rainy days and less than light in winter is more prominent. In addition to use poor quality relevant components, the other main reason is to reduce the cost of components blindly, do not according to demand design configuration, reducing the use of battery panels and batteries using standards, resulting in rainy days can not provide lighting.
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