What is the difference between the photovoltaic module IV tester and the EL tester

　　Let me introduce two important tests in the photovoltaic industry, the IV curve/EL test, which are mandatory tests for photovoltaic modules. And these two mandatory items are tested and verified by the IV tester and EL detector, respectively.

　　The photovoltaic module IV tester is mainly used to detect the power of photovoltaic modules, and finished modules are classified based on the detected power values. It is a solution for performance testing of photovoltaic modules. The photovoltaic module IV tester can test the on-site temperature, and calculate the module power based on the power, open circuit voltage, open circuit current of the tested module, and professional algorithms. Curve data can be automatically generated through supporting software.

　　The photovoltaic module IV tester uses a large capacitive load, so the test results are very fast, able to produce results in 0.5 seconds, and the consistency of the test results is very good. It can adapt to the assembly line and test once in 10 seconds, which is much higher than the testing effect and accuracy of handheld testing instruments, and also achieves no impact of irradiance changes. The photovoltaic module IV tester adopts the four wire method for measurement, ensuring the accuracy of voltage and current testing and eliminating other interference, so the test results are true effective values.

　　EL detectors are commonly used in places with photovoltaic modules, which are important equipment for identifying internal defects in the modules. Because the internal damage of the component cannot be detected with the normal naked eye, it is necessary to use an EL detector to detect the internal defect situation and specific location of the component. EL detection is based on the principle of electroluminescence, using a high-resolution infrared camera to capture and determine the defects of components. It has the advantages of high sensitivity, fast detection speed, and intuitive image results. It can comprehensively detect internal defects in photovoltaic modules, provide a basis for improving production processes, enhance product quality, and promptly repair defective photovoltaic modules to minimize losses.

　　Both of these detection devices are fully enclosed optical systems, ensuring the stable operation of the entire system, avoiding testing instability caused by external stray light, and ensuring the intuitiveness and accuracy of testing.