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<p>Compared with traditional street lamps, <a href="https://www.srssolargroup.com/solar-street-light" target="_blank">solar street lamp</a> have the advantages of installation without laying cables, energy saving and environmental protection without energy consumption, low-voltage safe electricity and a service life of up to 30 years, so it is difficult to design solar street lamp. But a lot of people don't know what the problem is with <a href="https://www.srssolargroup.com/solar-street-light" target="_blank">solar street light</a>.</p><p><br></p><p>Common problems in designing solar street lamp</p><p><br></p><p>1. Selection of light source</p><p><br></p><p>Most lawn lights use LED as the light source, LED life is long, can reach more than 100000h, low working voltage, very suitable for the application of solar lawn lights. In particular, there have been key breakthroughs in LED technology, and its characteristics have improved significantly in the past five years. At the same time, the performance and price ratio have been improved greatly. In addition, LED USES low-voltage dc power supply, its light source control cost is low, it is possible to adjust light and dark, frequent switch, and will not have a bad impact on the performance of LED. Leds can also control color, change the distribution of light and create dynamic illusions, so they are particularly suitable for solar lawn lights. But leds have many inherent characteristics that can lead to undesirable consequences if not used carefully.</p><p><br></p><p>At present, the high luminous efficiency of LED sold on the market can only reach 30Lm/W, which is only 1/2 of that of three-color efficient energy-saving lamps, and the luminous efficiency of three-color efficient energy-saving lamps can reach 50-80lm-w. Compared with two kinds of light source, the cost of producing each lumen is quite different at present. In terms of service life, the service life of the three-color efficient energy-saving lamp (including electronic ballast) can reach 6000h, and the LED can reach more than 100000h. On the surface, the LED life is dozens of times longer than that of the three-color efficient energy-saving lamp (including electronic ballast), but this is not the case.</p><p><br></p><p>At present, most solar lawn lamps adopt ultra-high brightness white LED. The time (life) when the optical flux maintenance rate reaches 50% of the initial brightness under 20mA electrified current is less than 10000h, which has been proved by the institute of electrical light source of fudan university. This argument shows that leds are not a good source of solar light in many cases, unless they are used in low-grade solar lawn lights with a service life of 1-2 years, or under 1W solar lawn lights. The solar energy lamp of 1W above, good use 3 main color efficient and energy-saving illuminant. At present, there are some solar lawn lamp with just 30 to 40 super bright white LED, the input power, for more than 2 w in this case, if the use of three main colors efficient energy-saving lamps, the price is only 1/10 of the leds, luminous flux is the original 2 times, more gratifying is now successfully developed 2-10 w low voltage dc tricolor efficient energy-saving lamps, service life can reach 6000 h.</p><p><br></p><p>2. Installation Angle of solar cells and light transmittance of lamp shade</p><p><br></p><p>Many solar lighting plants place solar cells horizontally for the sake of aesthetics. In this case, the output power of solar lithium-ion batteries will be reduced by 15-20%. If a decorative hood is added to the solar cells, the output power of solar cells will be reduced by 5% or so. Solar cells are expensive, we collected a lot of foreign solar lamp data, they in the beautiful and energy-saving both, most choose energy-saving. The ideal tilt Angle for solar cells in the lower reaches of the Yangtze river is about 40 °, with the direction being due south. For the solar lawn lamp that must add decorative outer cover to solar cell or the courtyard lamp that needs to add outer cover to light source, the pervious property of outer cover must be considered, as well as the problem such as anti-ultraviolet ageing below sunshine. The following table gives the transmittance of all kinds of commonly used materials, when designing solar cell and lamp shade, should give full consideration from the Angle of energy-saving.</p><p><br></p><p>3. Booster circuit and matching efficiency</p><p><br></p><p>Small power solar lawn lights are generally a booster circuit, the current manufacturers use the shock circuit inductance booster. The inductance adopts standard color code inductor, the standard color code inductor USES the open magnetic circuit, the flux loss is big, so the circuit efficiency is low. If a closed magnetic circuit is used to make inductance boost, such as a magnetic ring, the efficiency of the boost circuit will be greatly improved. We used 10 magnetic ring to make inductance, under the same conditions to carry out the control experiment, the comparison sample is a small power solar lawn lamp. Results the efficiency of inductance made by closed magnetic circuit is 20%-40% higher than that by standard color code inductor.</p><p><br></p><p>4. The price of solar street lamp</p><p><br></p><p>Many users for the solar street lamp price, only choose the cheap. This is wrong.</p>
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