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The Jiaotong University Optics Valley Photovoltaic Off grid Power Generation System is a power generation system that utilizes the principle of photoelectric effect to convert solar energy into electrical energy. It typically consists of solar cell components, controllers, battery packs, DC/AC inverters, etc. The purpose of solar cell modules is to convert solar energy into electrical energy, supply load operation or charge battery packs; The purpose of the controller is to protect the charging and discharging of the battery pack; A battery pack is used to store electrical energy; The purpose of an inverter is to convert direct current into alternating current. When the solar cell module cannot work at night or on rainy days, the battery pack supplies power to the load for operation.
The working mode of batteries can be divided into two types: cyclic use and floating charge use. Frequent charging and discharging, i.e. cyclic use; Frequently in a charged state, it is used as a floating charge, which can compensate for the capacity loss caused by self discharge of the battery. VRLA batteries used in photovoltaic power generation systems belong to the recycling mode.
To ensure high reliability of the battery system, it is first necessary to choose the correct battery. There are differences in the design between UPS and communication batteries: some batteries have good cycling characteristics; Some batteries are suitable for starting; Some batteries are suitable for low-temperature environments; Some batteries are suitable for low current discharge, etc. The editor of Optics Valley at Jiaotong University reminds everyone that when choosing batteries, it is necessary to understand the differences in technology and usage of various batteries. Firstly, it is necessary to fully understand the user's own needs for the product. For example, the capacity requirements of the backup power system, the frequency of use, the environment of use, important purposes, service life, reliability requirements, instantaneous discharge rate, rectifier specifications, and other battery related performance requirements. Secondly, it is necessary to understand the electrical performance of the battery, including product design parameters (battery model, appearance size, rated capacity, rated voltage, weight, weight specific energy, volume specific energy, design life, number of positive and negative plates, thickness ratio of positive and negative plates, electrolyte density, type of plate, material of grid, etc.), product electrical performance parameters, actual service life of the product, installation and usage environment The performance and price of different models, as well as the warranty period of different types of products.
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