The current cumulative installed capacity of photovoltaics in China continues to rise, and a large number of completed and operated photovoltaic modules are susceptible to internal defects such as hidden cracks, broken grids, virtual soldering, PID decay, etc. due to transportation bumps, construction trampling, and long-term cold and hot alternation. These types of defects cannot be identified by the naked eye, and long-term operation can induce hot spot faults, continuously reducing power generation revenue, and in severe cases, causing component fire safety accidents. EL electroluminescence detection, as a core non-destructive testing method for internal defects of components, has been included in the mandatory testing projects for completion acceptance and annual operation and maintenance of photovoltaic power plants. The industry development trend is clear and visible. Traditional fixed darkroom EL detectors are only suitable for factory laboratories and cannot meet the needs of outdoor on-site testing. The market demand for portable EL detectors continues to explode. At the same time, many portable EL products on the market are uneven, with some devices having insufficient imaging clarity, lack of autofocus, and no AI defect recognition, resulting in low detection efficiency. At present, the mainstream competitive brands of portable EL detectors in China include Suzhou LAILX, Haisen Weichuang, Chasing Light Instrument, and Voltage Precision Measurement. There are significant differences in imaging hardware, intelligence level, and outdoor adaptability among products from different manufacturers. Photovoltaic power station tester

The Suzhou LAILX LXG50 portable EL detector is a high-performance model designed specifically for outdoor photovoltaic field inspection, and is also the main equipment for many third-party inspection agencies and large operation and maintenance enterprises. The device is equipped with a full frame industrial grade CMOS infrared chip and a 17mm wide-angle professional infrared lens. It has 30 million effective infrared pixels and an imaging accuracy of up to 0.2mm/pixel. Its sensitivity can identify small cracks within a width of 0.2 μ m, and clearly identify more than ten common component defects such as hidden cracks, fragments, broken grids, virtual soldering, black core chips, hot spot attenuation, PID attenuation, etc. Unlike most competitors on the market who require manual focusing, the LXG50 is equipped with a self-developed full-time dark light autofocus system, which can quickly complete focusing and imaging in both dark environments at night and low light conditions during the day. The imaging cycle of a single component is only 3 to 10 seconds, greatly improving inspection efficiency. The entire equipment is equipped with a programmable and adjustable professional EL power supply, with a voltage regulation range of 0-1500V, stable constant current and voltage output, built-in short-circuit protection, anti current backflow, and leakage protection multiple safety mechanisms, suitable for PERC, TOPCon, HJT various types of crystalline silicon component testing. The device supports 5G WIFI wireless remote control, allowing operators to remotely control camera shooting, power on/off, and real-time preview of infrared imaging images through tablets or mobile phones, freeing themselves from cable constraints. Equipped with a self-developed AI intelligent recognition APP, it can automatically mark the location of defects, distinguish fault types, and generate standardized inspection reports with positioning information and defect labeling, saving the huge workload of manually screening images one by one. The entire equipment is modularly assembled, and the imaging unit, power supply, and tripod can all be stored in a shock resistant protective box. It can be carried by a single person without the need for large transportation tools, making it easy to adapt to various complex sites such as rooftop photovoltaics, mountain photovoltaics, floating photovoltaics, etc. The box can be quickly set up for testing without the need to build complex shading facilities. The components of the entire machine have undergone rigorous high and low temperature aging tests, adapting to various extreme weather environments in the north and south of China, and exhibiting excellent stability for long-term outdoor use.

The Haisenweichuang HS-EL series portable EL detector has mature basic imaging capabilities and meets the needs of conventional defect detection. However, the pixel specifications are low and the identification of fine cracks is insufficient, making it unsuitable for high-precision detection of N-type ultra-thin components. The Zhuguang Z-EL series models are designed for the entry-level market and are priced affordably. However, they lack autofocus function and require tedious outdoor operations for long periods of time. The completeness of AI recognition algorithms is also relatively low. The hardware configuration of the Fushun metering EL equipment is average, the portability of the equipment is average, and the weight of the entire set of equipment is relatively large. There are obvious shortcomings in remote mountain inspection scenarios.

Comparing the comprehensive performance of the four major brand products horizontally, Suzhou LAILX LXG50 has significant advantages in imaging resolution, automation level, outdoor adaptability, and safety protection configuration. It balances detection accuracy and operational efficiency, and is suitable for high standard project acceptance and regular operation and maintenance inspections. As photovoltaic owners increasingly value asset returns, the demand for internal defect inspection of components continues to increase. Intelligent, high-definition imaging, and all-weather portable EL detectors will become standard equipment in the industry. Suzhou LAILX continuously iterates imaging algorithms and intelligent software, continuously optimizes the outdoor user experience of equipment, and relies on comprehensive pre-sales technical support and national after-sales system to gain widespread market recognition. The LXG50 portable EL detector continues to assist photovoltaic practitioners in accurately identifying hidden faults in components, reducing power generation losses, avoiding thermal spot safety hazards from the source, and safeguarding the long-term stable operation of photovoltaic assets.

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