Split-type Solar Street Light System Design - Lighting

The Split-type solar street light is composed of the solar panels (including bracket), lamp head, control box (with the controller, battery, etc.) and lamp pole, foundation, etc. Split-type Solar street lamps generally form their own power supply system and are not connected with the grid network. There are two kinds of solar street lamp system: 12V and 24V. Solar cells convert solar energy into electricity. There are three kinds of more practical solar cells: monocrystalline silicon, polycrystalline silicon, and amorphous silicon. 1) Monocrystalline silicon solar cell performance parameters are relatively stable. It is suitable for use in southern areas where there are more rainy days and less sunlight; 2) Polycrystalline silicon solar cell production process is relatively simple, the price is lower than monocrystalline silicon. It is suitable for use in the East and west areas with sufficient sunlight and good sunshine; 3) Amorphous silicon solar cells have low requirements for sunlight conditions and are suitable for outdoor areas with insufficient sunlight. The working voltage of the solar cell is about 1.5 times the battery voltage, which can guarantee the normal charging of the battery. 8-9v is required for charging 6V battery For solar cells, 15-18v solar cells are needed to charge 12V batteries. It needs a 33-36v solar cell to charge a 24V battery. The output power per unit area of the solar cells is about 127wp / m2. Solar cells are generally composed of multiple solar cells in series, and their capacity depends on the total consumption of lighting sources and transmission components. Power and local solar radiation. The output power of solar cell should be more than 3-5 times of the light source power: when the light is abundant and the lamp is on The short sunshine area is more than (3-4) times, and vice versa. The output power WP of the solar cell is the 10L standard defined by the European Commission under the standard sunlight conditions, with the radiation intensity of 1000W / m2, The output power of solar cells at atmospheric quality AM1.5 and cell temperature 252c. The output power of the same solar cell is different at different times and different places. The so-called standard conditions are close to the sunshine conditions around noon on a sunny day. Table 1 sunshine conditions in different regions of China Generally, Split-type solar street light pole is more than 5m, with a high center of gravity. Most of the solar panels are hanging type, in order to enhance the wind resistance of the whole set of equipment, generally Select the component power required by the composition of multiple solar panels. Table-3 annual average sunshine time and optimal installation angle of major cities in China The battery stores the power generated by the solar panel when it is illuminated, and then releases it when it needs lighting at night. The Split-type solar street light system with battery is mainly discussed 1) Lead-acid (CS) battery: suitable for low- temperature high rate discharge, low specific energy, most of the current Split-type solar street light. Maintenance- free sealing,The price is low. Pay attention to prevent lead-acid pollution, which should be phased out. At present, lead-acid maintenance-free battery, ordinary lead-acid battery and alkaline nickel-cadmium battery are used less and less due to environmental protection and volume reasons. People tend to use more compact design lithium battery, especially the stable and long-life lithium iron phosphate battery. The capacity of the battery is too small to meet the needs of lighting at night, if the capacity is too large, the battery is always in a state of power loss, which affects the battery life, It also causes waste. The ratio of battery capacity (ah) to load capacity (ah) should be more than 3-6 times: in areas with less days of continuous rainy days, it should be more than 3-4 times It is 5-6 times more than that in rainy days. When connecting in parallel, the unbalanced effect of each cell should be considered. The number of parallel groups should not exceed The operation of solar street lamp is controlled by controller. Most controllers realize intelligent control. The controller shall have the following functions: Light control, time control, temperature control and other functions are available. With dimming (or midnight lights) function Limit the charging and discharging conditions of the battery to extend its service life: Display the working status of main components of solar street lamp: battery, solar cell, LED lamp, etc. The solar cell angle inclination refers to the angle between the solar panel plane to the horizontal ground. The inclination angle of solar cell module (which refers to the angle between the plane of solar cell and the ground plane) has been discussed in many technical circles. Tilt angle according to location. Set (latitude, etc.) to determine; the front of the solar panel is facing the sun (or South slightly West), and the inclination angle is consistent with the local latitude. If conditions permit· The tilt angle of solar panel can be adjusted according to the season. Refer to "table-3" for the installation angle of solar cells in major cities in China. According to the maximum wind power, the wind resistance design of olar street lamp is carried out: Table 4 corresponding relationship between wind force and wind speed There are more typhoons in the south of China. The solar street lamp pole should be able to resist at least grade 12 typhoons, and most areas in the North should be able to resist grade 10 gales. 1) Solar module: the manufacturer shall ensure that it can withstand the local wind speed without damage, with the emphasis on the connection between the battery module bracket and the light pole. 2) Lighting pole and foundation; wind resistance design of street lamp pole and foundation and height, area, inclination angle, pole structure, local maximum wind speed, etc. of battery board Relevant, the calculation and design shall be carried out by the lamp pole manufacturer or structural discipline to ensure the stability of the Split-type solar street light pole at the maximum wind speed. There are two forms of light source and solar energy system: 1) Solar powered HID lamp electronic ballast (or trigger, the same below). )In fact, it is a DC / AC high-value converter. Therefore, the Split-type solar street lighting system generally does not need additional DC / AC inverter to reduce the circuit loss. This form is suitable for the new solar street lamp project. 2) Equipped with traditional HID lamp electronic ballast: connected to AC220 mains power supply. Its electronic ballast is essentially AC / DC / AC high-frequency converter. If it is connected with solar energy system, DC / AC small power inverter shall be added between battery and hid lamp electronic ballast. This form is suitable for street lamp reconstruction. Solar powered street light does not need additional DC / AC inverter to reduce the circuit loss too, it allows up to 65% energy savings than conventional solar street light. Application: low power solar LED lamps are used in residential or commercial areas, such as 5W / 10W / 15W / 25W / 30W, etc. High power solar street lamps are generally used in industrial parks and road lighting, such as 40W / 60W / 80W / 100W / 120W. The solar street lamp generally uses dcl2v or DC24V. It is a safe voltage and does not do electrical protection grounding 1) Street lamps and solar panels shall not be used as lightning arresters; 2) Use metal lamp post as lightning arrester and downlead: 3) When the reinforcement cage of street lamp foundation is below -0.50m and the surface area of reinforcement is more than 0.37m2, it can be used as lightning protection grounding body. Otherwise, the artificial grounding electrode shall be added, with the grounding resistance ≤ 10 Ω. If necessary, connect the grounding body. The grounding method is the same as that of general street lamp 4) TVs (transient voltage suppression) lightning protection is set in the street lamp controller Split LED solar street lights are to be installed on a pavement in Shanghai. The lamp is 5 meters high, the street lamp input voltage is 24V, the power is 70W, the work is 8.5h every day, to ensure the continuous rainy days 7 days to provide lighting. 1.05 is the comprehensive loss coefficient of the solar cell module system, and o. 85 is the charging efficiency of the battery. Choose 2pcs Pm=135W solar panels in parallel. The best working voltage is 34.8V. Optimal operating current 3.88A. The component size is 800*1580*50mm Select the intelligent controller. According to the requirements of Shanghai street lamp system, adjust the controller parameters and protect the street lamp batter The direction of the solar pack is due south slightly to the west, with a horizon dip Angle of 34.170 As far as possible to use solar street lamp sets of products, by the manufacturer to provide qualified supporting anti-wind lamppost material and basic drawings, or by the structure of professional technical personnel according to the local climate conditions of the lamp poles and foundation anti-wind design or verification.

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Choose the right solar panels and battery depending on the wattage of the lamps, the required lighting level and the weather conditions. Solar panels or solar panels are designed to extract sunlight as an energy medium to produce electricity, light, etc.These cables are used to connect the battery compartment on the top of the pole, the LED and the solar panel. These panels are called photovoltaic because they are used to convert light energy directly into electrical energy.The energy stored in the battery is subsequently released in the form of direct current to power the LEDs for lighting at night. The use of sunlight minimizes the pollution of the environment resulting from the use of kerosene lamps in rural homes. Controllers available on the market these days include a charger, auxiliary power supply, LED lamp driver, microcontroller, and insurance circuitry. The battery can be recharged using the energy obtained from the solar panels at sunrise and taking into account that it charges the battery at sunset.During the day, solar energy is converted into electrical energy and stored in batteries. Now, the use of lithium batteries has been extended to the solar industry, replacing lead and gel batteries. When sunlight shines through the solar panel, the battery will charge and store electricity throughout the day. The principle of solar cells is that if the amount of light falling on the battery is more, it helps to generate more electricity.You can check out our How Sunlight Works article for more information. In rainy or cloudy weather, these devices will not charge to the optimum level. It is a convenient, economical, durable and modern way to illuminate streets and houses. This type of sunlight emits a wide beam of high intensity that covers a large area.Each time you press the button, the operating modes will change, while the light will flash. If not configured correctly, it will affect battery charging performance, shorten illumination time, and also affect detection performance, resulting in inaccurate auto power-on times. In fact, sphere integration can also help get even more electrical parameters such as illumination (brightness), light output, and so on.LEDs (Light Emitting Diodes) last longer and are more durable, so the device is worth your money. Typically used for emergency lighting such as power outages and nighttime activities. It then turns on the light automatically, so you don't need to worry about manually controlling it.If low-quality lithium batteries are used, they need to be replaced frequently after long-term use, resulting in very high actual use costs. All you have to do is use its auger and rotating rod to balance and fix the light. High-quality lithium iron phosphate battery with a service life of up to ten years. These fixtures are more common and easier to install than the other three.The color rendering index (CRI) shows how well a light source allows a substance to reflect its true color; the higher the CRI, the more an object can reflect its true color under that light source. Outdoor luminaires usually have an IP65 rating, which is the highest level of protection for outdoor luminaires, excluding underwater luminaires. Because these light poles are installed in harsh environments, the coating of the battery, equipment, and exterior surface finishes require extra care during installation. At the same time, keep it away from the shadows of the house, trees, etc.
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