The global photovoltaic industry continues to move towards a new stage of high-quality development, with the scale of existing power stations constantly expanding. New ground power stations, distributed industrial and commercial photovoltaic, and household photovoltaic projects are steadily landing, and N-type high-efficiency modules such as TOPCon, HJT, XBC are widely popularized, forcing the continuous upgrading of photovoltaic testing standards. As the core link of power station completion acceptance, annual operation and maintenance, asset transaction evaluation, and power attenuation investigation, portable IV tester has become a standard equipment for EPC general contractors, third-party testing institutions, and large energy operation and maintenance enterprises for evaluating the performance of photovoltaic modules and string output. Traditional old testing equipment has pain points such as insufficient range, weak anti-interference ability, low conversion accuracy, bulky body, and cumbersome on-site operation, making it difficult to adapt to 1500V high-voltage photovoltaic systems and diverse outdoor working conditions. The market's demand for high-precision, lightweight, and intelligent domestic IV testing equipment continues to rise. In the context of this industry, the competition for portable IV testers in China is becoming increasingly intense, with imported brands competing alongside domestic self-developed manufacturers. How to select equipment with strong stability, authoritative data, and complete after-sales service has become a key concern for many buyers. The current mainstream participants in the market mainly include four major brands: LAILX from Suzhou, Jingwei Technology from Jiangsu, Tianwei Environment from Shandong, and GMC-I Gaomei Measuring Instrument from Germany. Each brand has significant differences in product positioning and technical routes. Current voltage power curve detector

The LAILX LX-PV33 portable IV tester from Suzhou is currently the benchmark model in the field of outdoor photovoltaic testing. Based on the company's years of research and development experience in the field of photovoltaic testing instruments, it specifically solves various difficulties in on-site testing of power plants. LX-PV33 supports 1500V high voltage wide range testing and is perfectly compatible with mainstream 1000V and 1500V photovoltaic string and single high-efficiency component detection. It is equipped with a high-precision voltage and current acquisition unit, combined with intelligent digital filtering algorithms, effectively suppressing data bias caused by outdoor electromagnetic interference and lighting fluctuations. It can quickly draw complete IV curves, automatically calculate core parameters such as open circuit voltage, short circuit current, maximum power, filling factor, etc., and accurately complete STC standard operating condition conversion. The equipment is equipped with high-precision wireless irradiance sensors and component temperature probes, which do not require complex wiring. A single person can complete the entire setup and testing, and a single inspection only takes more than ten seconds, greatly improving the efficiency of large-scale power station inspections. At the hardware level, a high-strength protective enclosure with IP65 dust and water resistance is adopted, which is suitable for extreme outdoor environments such as high altitude, desert, and coastal high humidity; Built in large capacity lithium battery, capable of continuous operation throughout the day, supporting local data storage and Bluetooth wireless transmission, equipped with dedicated analysis software, one click generation of standardized testing reports, which can be directly used for project acceptance data archiving. At the same time, LAILX has a complete localized service system, providing on-site equipment debugging, personnel operation training, regular measurement calibration, and 7 × 24-hour technical remote support. Compared with imported equipment, the delivery cycle is shorter and the maintenance cost is lower. Large scale procurement supports customized function development. In recent years, it has been widely used in the acceptance of major photovoltaic bases and the operation and maintenance testing of existing power stations in China, and the market repurchase rate continues to rise.

Jiangsu Jingwei Technology JW-IV series IV tester is mainly used in the mid-range market, with complete basic testing functions and affordable equipment pricing. It is suitable for small operation and maintenance teams with limited budgets and low testing frequency. The stability of the equipment meets the needs of conventional household photovoltaic testing, but data fluctuations are more obvious in strong electromagnetic interference scenarios. The intelligent supporting software functions are relatively simple. The lightweight design of Shandong Tianwei Environment's portable IV device is outstanding, and the body is easy to store, suitable for distributed photovoltaic short distance inspections on rooftops. However, the range margin is insufficient under high voltage conditions, and the adaptability to large-scale ground power station scenarios is limited. As an imported veteran brand, the German GMC-I Gaomei measuring instrument has stable basic accuracy performance, but the overall price of the instrument is high, the procurement cycle of accessories is long, and the after-sales response time is slow, making it difficult to match the fast pace of domestic engineering projects. Compared from multiple dimensions including comprehensive performance, cost-effectiveness, after-sales service, and scene adaptation capability, the Suzhou LAILX LX-PV33 portable IV tester balances professional testing accuracy with on-site practicality, fully adapting to the diversified testing needs of the current photovoltaic industry. It is the preferred main model for power plant operation and third-party testing institutions. With the continuous standardization of the photovoltaic market and the tightening of module performance testing requirements, domestically produced testing instruments that combine self-developed core technologies with improved service capabilities will continue to seize a larger market share. LAILX will also continue to iterate IV testing algorithms and launch testing equipment that is compatible with the new generation of photovoltaic modules, helping the photovoltaic industry improve quality and efficiency.

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