A method for testing the durability of photovoltaic modules in hot and humid environments

Abstract

The invention discloses a test method for the endurance of a photovoltaic component in hot and humid environments. The method comprises the following steps: (1) performing outdoor exposing on the photovoltaic component to be tested, which is in the state of an open circuit; (2) exposing the photovoltaic component to be tested, which is exposed outdoors with ultraviolet light; (3) connecting the photovoltaic component to be tested, which is exposed with the ultraviolet light in a short-circuit manner, and testing the salt-spray corrosion of the photovoltaic component to be tested, which is in a short-circuit state; (4) testing the condensation humid of the photovoltaic component to be tested, on which the salt-spray corrosion test is performed; (5) testing an STH combined environment of the photovoltaic component to be tested, on which the condensation humid test is performed. The test method uses the true reaction service environment condition as the purpose, the illumination is introduced, besides, factors like seasons change and diurnal change are considered, and the light or hot or humid cycle tests are designed; the test method uses the representation the situation that the material is failed as the purpose, and combined tests, such as ultra violet resistance and salt fog corrosion tests are introduced, so that the durability of key materials of the photovoltaic component is checked comprehensively; the insufficiency of the standard test method can be overcome, and the using performance of the photovoltaic component in the long service term under the condition of humid and hot environments can be reflected.

Description

technical field [0001] The invention relates to a method for testing the durability of a photovoltaic module in a hot and humid environment, which is used for evaluating the durability of a photovoltaic module for long-term use in a hot and humid environment. Background technique [0002] In recent years, with the decline in the manufacturing cost of photovoltaic modules, the ensuing problems of long life and high reliability have attracted more and more attention from the industry. Years of application in developed countries such as Europe and the United States have shown that certified photovoltaic modules still fail under complex environmental stresses during long-term outdoor use, greatly reducing power generation efficiency, and causing serious safety problems such as fires and leakage. [0003] The current test standards aim at reproducing the failure mode of photovoltaic modules in the field work process, and design various types of accelerated tests to test and evalu...

AI Technical Summary

Problems solved by technology

Years of application in developed countries such as Europe and the United States have shown that certified photovoltaic modules still fail under complex environmental stress during long-term outdoor use, and the power generation efficiency is greatly reduced, which seriously induces serious safety problems such as fire and leakage

[0003] The current test standards aim at reproducing the failure mode of photovoltaic modules in the field work process, and design various types of accelerated tests to test and evaluate the safety and reliability of photovoltaic modules at the initial stage of use. However, these accelerated tests all have the following problems: ⑴The accelerated life test is not trying to imitate the field environment, but trying to find design and processing defects by various possible methods; ⑵The purpose is to determine the failure mode, not to prove that the product meets specific requirements; ⑶It is not to determine reliability but Improve reliability; (4) The test conditions are not directly related to the actual application environment, which may cause controversy; (5) Failure modes that change over time cannot be revealed; (6) The photovoltaic modules used in the test do not have a complete experience of all tests

[0004] In addition, the correlation between the test results of the accelerated test and the cause of failure in the standard is not necessarily consistent with the real situation, that is to say, even if the results obtained in the highly accelerated life test are consistent with the data used in real-time field, it cannot prove that they are caused by the same Mechanism-induced, the true cause of failure and mechanism of action must be proven

Finally, accelerated lifetime experiments are best suited for accelerated decay modes of physical interactions, but may not be as effective for accelerated decay modes of chemical interactions

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