it is known,Photovoltaic modulesIt is an important part of the photovoltaic power generation system, and the cost of the components accounts for half of the cost of the photovoltaic system. However, how much do you know about the working principle, composition, production, efficiency calculation and related parameters of photovoltaic components? Today, let me introduce the basic knowledge of photovoltaic components in detail.
Principle of solar power generation
PN junction is composed ofSolar CellsThe most basic structure of a junction. Its main function is to separate the electron-hole pairs generated by light and generate a potential difference at both ends of the junction under the action of its built-in electric field. When connected to a load, a directional movement of current is generated and electrical energy is transferred along with the current.
Simply put, the principle of solar power generation is to convert solar energy into electrical energy. It is connected to the power grid or battery through an external circuit to form a grid-connected photovoltaic system or an independent photovoltaic system.
SolarPhotovoltaic modulesComposition and technical performance of each part
Photovoltaic modules are mainly composed of tempered glass - EVA - battery string - EVA - back panel - aluminum frame - junction box - connector.
1) Tempered glass: protects the cell, is waterproof, UV-resistant, has high light transmittance, strong impact resistance, and long service life. The general thickness is 3.2mm, and the light transmittance exceeds 90% within the wavelength range (320-1100nm) of crystalline silicon solar cells. It has a high reflectivity for infrared rays with a wavelength greater than 1200nm, and can also resist solar ultraviolet radiation.
2) EVA: It acts as a bond between the battery and glass, and between the battery and TPT. After curing, the light transmittance reaches more than 90%.
3) Battery string: power generation.
4) Back panel: insulation, moisture-proof, UV-resistant, seepage-proof, aging-resistant and corrosion-resistant.
5) Aluminum frame: protects the module, connects and installs, and has strong impact resistance.
6) Junction box: Lead out the busbar and configure bypass diodes to reduce the impact of shadows and hot spots.
7) Plug: connection function.
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