Technical problems of solar lights

With the development and progress of solar photovoltaic technology, solar cells, as a new energy, first used in lighting, solar lighting products due to the dual advantages of environmental protection and energy saving. Solar LED lighting products are a new generation of green lighting products, and its major components, including the battery box solar photovoltaic semiconductor lighting source. LED solar lights integrated solar photovoltaic and LED solid-state lighting advantages of solar LED lighting system to achieve the perfect combination of a new generation of energy and new light source. However, in the design of solar lighting, involving light source, solar battery system, battery charge and discharge control many factors, any link problems are caused by defects in the product.

The LED characteristics close to the regulator diode, changes in operating voltage 0.1V, operating current may change 20mA. For safety, the ordinary case limiting resistor in series, and a great deal of energy loss is obviously not suitable for solar lawn lamps, and LED brightness changes with the operating voltage.

4, the discrete nature of operating voltage, the same model, the same batch of LED operating voltage have some differences, and should not be used in parallel. Must be used in parallel, should consider both streams.

5 super bright white LED color temperature of 6400k-30000k. Low color temperature ultra bright white LED yet to enter the market, manufactured with a super bright LED solar lawn lights penetrating power is relatively poor, so pay attention to the optical design.

6 large electrostatic super bright LED to have anti-static installation facilities, workers have to wear an anti-static wrist. Damage by electrostatic ultra bright white LED was probably their eyes can not see out, but life will be shorter.

7, the system portfolio to pay attention to the photosensitive sensors, solar lamp light control switch, and some designers often use photosensitive resistor to automatically switch lights, solar cell itself is actually an excellent photosensitive sensors, with It do photosensitive switch characteristics better than photoresistor. For the application of solar garden is not a big problem, but for the mere use of a 1,2 VNi-Cd batteries, solar lawn lamp, solar cell device consists of four solar cells in series, the voltage is low, lower voltage under low light even the day did not the black voltage below 0,7 V, resulting in light control switch malfunction. In this case, add a transistor direct coupled amplifier, you can solve the problem.

8, demand battery voltage level of the control load size, solar lights are often demanding sustainable time of consecutive rainy days, which increases the cost of the system. Consecutive rainy days, when the battery voltage decreases to reduce the number of access of LED or the energy-saving lamp, or to reduce solar lights a luminous time per day, which reduces the cost of the system.

9, flashing dimmer, dimming fade is a good way to energy-saving, one hand, it can increase the effect of solar lawn light irradiation, on the other hand can flicker by changing the duty cycle control battery average output current, and extend the system work time or Under the same conditions, and reduce costs.

10, the switching speed of the three-color color energy efficient lamps.

11, the solar cell is not able to use the main road lighting, highway trunk illumination lighting statutory requirements in respect of the conversion efficiency of solar cells and prices, is not able to meet this requirement. With the improvement of all aspects of technical level in the near future, the solar cells will be used in the main road lighting.

12 on the storage capacitor, solar battery life of more than 25 years, the ordinary life of the battery in 2-3 years, so the battery is the weakest link in the solar power system. The storage capacitor can solve this problem to some extent. The service life of the storage capacitor can reach more than 10 years, and the control circuit is simple, but the high price limits its application, currently only application on the part of the traffic lights and decorative. With the improvement of the technical level, the decline in the price of the product, it will be one of the most promising solar cells supporting ideal energy storage element.