Through the following analysis, the I-V characteristic curve shape of the photovoltaic array can be detected using a portable IV curve tester, which can not only preliminarily determine the photovoltaic moduleWhether the power generation performance is normal,You can also find that there isFaulty PV modules,Replacing the faulty component solves the problem, but the cause of the damage cannot be further determined.
Photovoltaic modules can only be used after transportation, handling and installation after leaving the factory, and it is inappropriate to find out the cause only after finding that the power generation is low in the process of use, because any mistake in any link will cause damage to the module. Therefore, we recommend sampling testing the modules before the installation of the PV modulesAfter installation and fixation, all portable IV curve testers are used to test the photovoltaic array.
Photovoltaic power stations** The proportion of power stations with photovoltaic module power generation performance problems in the total number of power stations is at least 10% or more, and only by carrying out the detection and careful analysis of the portable IV curve tester can we ensure that there is no problem with the quality of the photovoltaic array after installation.
The failure of the electrical performance of photovoltaic modules will generally not lead to the shutdown of power generation or safety accidents in photovoltaic power stations, but will only reduce the power generation efficiency, according to the relevant regulations, when the power generation efficiency decreases by more than 5%, the quality of the power station is judged to be unqualified.
Although problems can be identified in components through characteristic curves, further problems need to be carefully analyzed to find the cause.
Abnormal characteristic curves of photovoltaic modules are usually caused by the following reasons:Dust blocking, broken individual cells, mismatched module parameters, short circuit of bypass diodes, etc.
The characteristic curve of photovoltaic modules, also known as i-V curve, is an important basis for analyzing the power generation performance of photovoltaic modules. In general, the I-V curve test is carried out when the module leaves the factory to determine whether the electrical performance of the module is normal and the power is large. However, after the installation of the power station, few people will go to the I-V curve test of the array, and from my experience, I think it is very necessary to perform a convenient IV curve tester test.