As science and technology develop more and more rapidly, more and more new energy sources appear. Wind power, nuclear power, solar power, etc. Nowadays, solar energy is the most widely used source of energy. Not only is it environmentally friendly, but it also has abundant resources. Solar panels not only convert the sun's thermal energy into electrical energy, but also store electrical energy. Solar panels are mainly made of crystalline silicon materials and are used in many fields. The most common is electricity. Solar panels convert light energy from the sun into electrical energy and can charge and discharge continuously. energy.
Solar panel prices
A single solar cell cannot be used directly as a sourceand energy. To realize a power supply, several individual cells must be connected in series, in parallel and tightly sealed within the components. Solar panels (also called solar cell modules) are the essential part of the solar power generation system and the most important part of the solar power generation system.
Xinghuo 100w monocrystalline solar power costs 385.00 yuan (price source, for reference only).
How much does a 5W solar panel cost, 37.00 yuan (price source, for reference only).
300W solar power generation system? 1688.00 yuan? (price source, for reference only).
Solar panel components
(1) Tempered glass: Its function is to protect the main body from the production of 'electricity (such as batteries) ), there are requirements for the selection of transmissionn of light:
1. Light transmittance should be high (generally above 91%
2. Ultra-white tempered); treatment.
(2) EVA: Used to bond and fix the tempered glass and the main body of power generation (battery sheet). The quality of the transparent EVA material directly affects the lifespan of the component exposed to the EVA. air is prone to aging and degeneration, thereby affecting the light transmission of the module, thereby affecting the power generation quality of the module. In addition to the quality of the EVA itself, the module manufacturer's lamination process is also of great importance. impact. For example, the bonding degree of EVA is not up to standard, and EVA and tempered glass, backplane, insufficient bonding strength will cause premature aging of EVA and affect the lifespan life of the components.
(3) Cells: the main function isto produce electricity. The main market for power generation is crystalline silicon solar cells and thin-film solar cells, both of which have their own advantages and disadvantages. Crystalline silicon solar cells have relatively low equipment costs, but high consumption and cell costs. However, the photoelectric conversion efficiency is also high and is more suitable for generating electricity under outdoor sunlight. Thin-film solar cells have relatively high equipment costs, but low power and battery costs. However, the photoelectric conversion efficiency is more than half of that of crystalline silicon cells, but the low light effect is also very good. ordinary light, like on a solar cell calculator.
(4) Backplate: Function, waterproofing, isolation and waterproofing. Typically, TPT, TPE and other materials are used and must be resistant to aging. Most component manufacturers offer a 25-year warranty. Tempered glass and aluminum alloys are generally no problem. It depends on whether the backplate and silicone can meet the requirements.
(5) Aluminum alloy: protects rolled parts and plays a certain sealing and supporting role.
(6) Junction box: Protects the entire power generation system and acts as a power transfer station. If any component is shorted, the junction box automatically disconnects the shorted battery string to avoid any hazards. critical element of the entire grill junction box system. This is the diode selection. Depending on the cell type of the module, the corresponding diodes are also different.
(7) Silica gel: foSealing function, used to seal the junction between components and aluminum alloy frames, components and junction boxes. Some companies use double-sided tape and foam to replace silica gel. commonly used in China. The process is simple, practical, easy to use and the cost is very low.
Types of solar panels
Monocrystalline silicon solar panels
The photoelectric conversion efficiency of monocrystalline silicon solar panels is by about 15%. the highest reaches 24%, which is the highest photoelectric conversion efficiency among all types of solar panels. However, the production cost is so high that it cannot be widely and commonly used in large quantities. Since monocrystalline silicon is usually encapsulated in tempered glass and waterproof resin, it is strong and durable,with a lifespan of typically up to 15 years and up to 25 years.
Polycrystalline silicon solar panels
The manufacturing process of polycrystalline silicon solar panels is similar to that of monocrystalline silicon solar panels, but the photoelectric conversion efficiency of solar panels in polycrystalline silicon is much weaker. Its photoelectric conversion efficiency is about 12% (on July 1, 2004, Japan Sharp launched the world's most efficient polycrystalline silicon solar panel with an efficiency of 14.8%). In terms of production cost, it is cheaper than monocrystalline silicon solar panels. The material is easy to manufacture, saves energy, and the overall production cost is low, so it has been widely developed. In addition, the lifespan of polycrystalline silicon solar panels is shorter than that of silicon solar panels.monocrystalline. In terms of performance-price ratio, monocrystalline silicon solar panels are slightly better.
Amorphous silicon solar panel
Amorphous silicon solar panel is a new type of thin film solar panel that appeared in 1976. It is completely different from monocrystalline silicon solar panels and in polycrystalline silicon. the process is greatly simplified, the silicon consumption is very low, and the power consumption is lower. Its main advantage is that it can produce electricity in low light conditions. However, the main problem of amorphous silicon solar panels is that the photoelectric conversion efficiency is low, the international advanced level is about 10%, and it is not stable enough. Over time, its conversion efficiency decreases.
Solar panels are mainly made of crystal silicon materialsin, and solar panels are used in many fields, such as electric power, communications, transportation, petroleum and power supply for home lighting. And the technology used in solar panels is also very advanced. It is made of tempered glass, cells, backsheets, aluminum alloys, junction boxes, silicone and other components. Solar panels can not only fully absorb solar energy, but also can be converted into other functions according to individual needs. More and more industries are starting to try using solar panels.
One, the sunClassification of solar cells:
Solar cells currently on the market are divided into amorphous silicon and crystalline silicon. Crystalline silicon can be divided into polycrystalline silicon and monocrystalline silicon. Judging by the effectiveness of conphotoelectric version of the three materials: monocrystalline silicon (up to 17%) > polycrystalline silicon (12 to 15%) > amorphous silicon (around 5%). However, crystalline silicon (monocrystalline silicon and polycrystalline silicon) basically does not generate current under low light, and amorphous silicon is good under low light (it has very little energy under low light). Therefore, from an overall point of view, it is suitable to use monocrystalline silicon or polycrystalline silicon solar cell materials.
Second, the selection method of solar cells
1 When we purchase solar cells, the focus is on the power of solar cells. Generally speaking, the power of solar panels is the same. like the power of solar cells. Directly proportional to the surface area of the solar panel. The surface area of the solar cell wafer is not completely equal to thehas the panel surface of the solar package, because although some solar panels are large, the gaps between single solar pads are very wide and the power of these solar panels is not necessarily high.
Knowledge about purchasing solar batteries
2. Generally speaking, the larger the power of the solar panel, the better, so that the current generated in the sun is large and it can be built. -in quickly. The battery is fully charged. But in reality, you have to find a balance between the power of the solar panel and the portability of the solar charger. It is generally believed that the minimum power of a solar charger cannot be less than 0.75W, and an under-power solar panel can produce 140mA current under standard strong light. The current generated under sunlight is about 100mA. If the charging current is too low below underpower, there will be almost no obvious effect.