Solar module Solar module refers to solar cell module. Because...
The composition structure and material composition of photovoltaic module
Constituent structure
Refers to a package and internal connection, can provide direct current output, the smallest indivisible photovoltaic cell combination device.
Photovoltaic modules (commonly known as solar panels) are composed of solar cells (two specifications of the whole sheet 125*125mm, 156*156mm, 124*124mm, etc.) or solar cells of different specifications cut by laser cutting machine or steel wire cutting machine. Since the current and voltage of a single solar cell are very small, then we put them first in series to obtain a high voltage, and then in parallel to obtain a high current, through a diode (to prevent current input) and then output.
They are enclosed in a stainless steel, aluminum or other non-metal frame, fitted with glass and a backplane on the back, filled with nitrogen, and sealed.
The whole is called a module, that is, a photovoltaic module or solar cell module.
Material composition
Its role is to protect the main body of power generation (such as battery), and the selection of light transmission is required:
Light transmittance must be high (generally more than 91%);
Super white tempering treatment
Used to bond and fix the tempered glass and power generation body (such as battery), the quality of transparent EVA material directly affects the life of the component, EVA exposed to the air is easy to age yellow, thus affecting the light transmission of the component, thus affecting the power generation quality of the component in addition to the quality of EVA itself, the lamination process of the component manufacturer is also very large. If EVA adhesive connection is not up to standard, EVA and tempered glass, backplane bonding strength is not enough, will cause early aging of EVA, affecting the life of the component.
The main role is power generation, the main market is the mainstream of crystalline silicon solar cells, thin film solar cells, both have advantages and disadvantages of crystalline silicon solar cells, the equipment cost is relatively low, but the consumption and the cost of the cell is very high, but the photoelectric conversion efficiency is also high, in the outdoor sunlight power generation is more suitable for thin film solar cells, relatively high equipment cost, However, the consumption and battery cost are very low, but the photoelectric conversion efficiency is more than half of that of the crystalline silicon cell, but the low-light effect is very good, and it can also generate electricity under ordinary light, such as the solar cell on the calculator.
Functions as above, mainly bonded packaging power generation body and backplane
Function, sealing, insulation, waterproof (generally used TPT, TPE and other materials must be resistant to aging, most component manufacturers warranty is 25 years, tempered glass, aluminum alloy is generally no problem, the key is in the backplane and silicone can meet the requirements.)
Protective laminate, plays a certain sealing, supporting role.
Protect the entire power generation system, play the role of current transfer station, if the component short-circuit junction box automatically disconnect the short-circuit battery string, to prevent burning the entire system junction box the most critical is the selection of diodes, according to the type of battery in the component, the corresponding diode is not the same
Sealing function, used to seal components and aluminum alloy frame, components and junction box junction some companies use double-sided tape, foam to replace silicone, the domestic common use of silicone, simple process, convenient, easy to operate, and the cost is very low.
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A lithium battery pack for home energy storage systems, which is compatible with solar panels and the sun The inverter can work together with the power grid to power household appliances, and it can also be used as a For off grid systems.
Extended reading
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