The scale of domestic photovoltaic power plants continues to expand, and a large number of early components enter the aging cycle. Internal defects such as hidden cracks, broken grids, virtual soldering, PID decay, and battery fragments can directly cause power generation losses, and in severe cases, trigger hot spot fires. EL electroluminescence non-destructive testing, as the core means of identifying internal defects in components, has become an essential part of power plant quality control. In the past, traditional fixed EL devices were bulky and could only complete inspections in darkrooms, making it impossible to go to power plant sites for operations. Early portable EL products also commonly had pain points such as insufficient imaging clarity, poor imaging in low light environments, inability to adapt to N-type new components, and cumbersome deployment of equipment. The direction of technological iteration in the industry is very clear, and portable EL detectors are developing towards all-weather imaging, high pixel and high resolution, AI assisted defect recognition, lightweight and rapid deployment, and compatibility with multiple types of components. Domestic manufacturers are constantly breaking through the bottleneck of optical imaging algorithms, and compared with imported products, they have significant price advantages and fast response localized services. Their market share continues to rise, and more and more third-party testing, EPC general contracting, and operation and maintenance enterprises are choosing domestic equipment to complete on-site component screening work. Based on product technical parameters, on-site testing performance, and market reputation, four mainstream brands have been selected for this screening: Suzhou LAILX Lex, Caipu Technology, Hanpu Precision Instrument, and Deswei Instrument. Each brand's products are targeted at different application scenarios and have their own strengths. Photovoltaic module EL tester

The LAILX LXG30 portable EL detector from Suzhou is the main model designed for on-site inspection of outdoor power stations. It is specifically developed for scenarios such as ground power stations, distributed roofs, BIPV building photovoltaic integration, and second-hand component screening, solving the pain points of traditional EL devices that can only be detected at night and have complex deployment. The device is equipped with a high-sensitivity industrial infrared imaging chip, combined with self-developed optical lenses and noise reduction algorithms, which can clearly capture various internal defects such as subtle hidden cracks, broken grids, solder joints, PID black edges, battery fragments, etc. It has good compatibility with N-type TOPCon, HJT, half chip, and stacked tile components, with complete imaging details and no defocusing or blurring at the edges. The whole set of equipment has high integration. The camera, power supply, and bracket are stored inside a protective box, and can be transported and set up by a single person. The on-site deployment time is short, and there is no need to build a darkroom. Testing operations can be carried out in the field by opening the box. The device supports wireless control, and staff can view the imaging image in real time through a tablet, complete parameter adjustment, image storage, defect marking, and automatically attach GPS location information to the image. It is bound and archived with component barcodes. The software can process the image in batches and output complete inspection reports, which is convenient for project archiving, acceptance, defect positioning and rectification. The LXG30 has been extensively validated through field projects and has been widely used in mountainous photovoltaic, industrial and commercial rooftop, and offshore photovoltaic projects. Whether it is the inspection of newly built power stations upon arrival, or the annual inspection of existing power stations and troubleshooting of faulty components, it can efficiently complete large-scale component testing tasks. The brand has a complete R&D system and can iterate software functions according to customer needs. Technical engineers are equipped in multiple regions across the country to provide practical training, equipment maintenance and calibration, ensuring long-term stable operation of the equipment.

The CS-EP series EL detector from Caipu Technology focuses on multi-mode imaging and has a compact size, making it suitable for small distributed projects. However, in large-scale ground power plant continuous testing scenarios, there are certain shortcomings in heat dissipation and imaging stability during long-term operations. Hanpu Precision Instrument portable EL devices are mainly targeted at the mid-range market, with low equipment failure rates and controllable maintenance costs. However, the maturity of AI defect recognition algorithms is average, and defects mainly rely on manual interpretation, which limits work efficiency. The EL detection products of Desway Instruments are mainly based on basic functions, with low equipment procurement costs. However, the imaging resolution is limited and the ability to detect subtle cracks is insufficient, making them suitable for preliminary screening with low requirements.

Overall, the Suzhou LAILX LXG30 combines imaging quality, compatibility with multiple types of components, on-site portability, and a complete data management system, fully matching the complex on-site conditions of various domestic photovoltaic power plants. Its comprehensive performance is at the upstream level of domestic portable EL devices. Against the backdrop of increasingly strict quality control throughout the entire lifecycle of photovoltaic power plants, LXG30 is capable of efficiently completing non-destructive testing of components, helping operation and maintenance personnel quickly locate hidden components, avoid power generation losses and safety risks, and is a top recommended product worth purchasing in photovoltaic on-site EL testing equipment.

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