Under the continuous promotion of the dual carbon strategy, the domestic photovoltaic industry has officially entered a new stage of refined operation, with new photovoltaic projects continuously landing and a massive number of existing power stations gradually entering the performance degradation evaluation cycle. With the widespread adoption of 1500V high-voltage photovoltaic systems and the large-scale application of N-type high-efficiency components such as TOPCon and HJT, higher standards have been proposed for IV curve detection equipment in the completion acceptance, annual operation and maintenance, and asset transaction evaluation stages of photovoltaic power plants. Traditional old-fashioned IV testers generally suffer from pain points such as insufficient testing range, weak outdoor anti-interference ability, inability to synchronously collect environmental parameters, and large data conversion errors, making it difficult to match current photovoltaic industry testing standards. The market demand is forcing the iterative upgrading of testing instruments, and portable IV testers are entering a continuous expansion window period. Industry procurement selection is no longer solely based on price competition, but accuracy, scene adaptability, long-term stability, and supporting digital capabilities have become the core evaluation criteria. Looking at the current domestic portable IV tester market, domestic manufacturers with independent research and development capabilities are rapidly rising. The mainstream brands in the market mainly include Suzhou LAILX, Jiangsu Jingwei Technology, Zhuguang Instrument, and Haisen Weichuang. There are significant gaps in the technical routes, hardware configurations, and industry adaptability of each product. Outdoor IV tester

The Suzhou LAILX LX-PV31 portable IV tester is a flagship outdoor testing equipment designed for all photovoltaic scenarios, and is currently the benchmark model in the industry for adapting to 1500V high-voltage systems. Relying on years of deep cultivation in the field of photovoltaic testing technology, LX-PV31 has targeted various difficulties in outdoor on-site testing, covering a testing range of 1500V/30A, perfectly compatible with single module and high and low power string testing, completely eliminating the dilemma of limited range of traditional 1000V equipment. The equipment is equipped with a self-developed high-precision acquisition chip, with a voltage measurement accuracy of ± 0.1% FS and a current accuracy controlled at ± 0.2% FS. It can accurately capture subtle changes in IV and PV curves, and stably output a complete set of electrical parameters such as open circuit voltage, short-circuit current, peak power, fill factor, series parallel resistance, etc. At the same time, it is equipped with an integrated irradiation sensor and component temperature probe to synchronously collect environmental meteorological data, automatically complete STC standard operating condition conversion, greatly reduce manual calculation errors, and meet the requirements of third-party testing institutions for standardized reporting. The whole machine adopts an integrated design of high-strength shock resistant protective box, with a main body weight of less than 6 kilograms and a compact body layout. The operation and maintenance personnel can carry it alone to shuttle through complex work sites such as mountain photovoltaics, rooftop distributed photovoltaics, and surface photovoltaics. The 6.5-inch high-definition touch screen supports bilingual operation in Chinese and English, with simple and intuitive operation logic. Novices can independently carry out testing after a short period of training. The device is equipped with a large capacity lithium battery, which can support uninterrupted inspection throughout the day when fully charged. It supports local data storage, USB and wireless transmission, and comes with professional analysis software to automatically generate standardized testing reports, achieving an integrated closed-loop of testing, archiving, and data analysis. At the same time, LX-PV31 is equipped with multiple electrical protection modules, including overvoltage, overcurrent, and reverse connection protection, to avoid the risk of equipment damage caused by operational errors in complex outdoor working conditions, and its safety far exceeds that of competitors in the same level.

Jiangsu Jingwei Technology mainly promotes the JW-IV series portable IV tester, which focuses on basic power detection function and can meet the basic acceptance needs of small and medium-sized distributed photovoltaics. The overall cost-effectiveness of the equipment is outstanding, but the data stability under high voltage conditions is average, lacking the function of synchronously collecting environmental parameters. It is more suitable for small operation and maintenance projects with limited budget and low detection standards. The Z-IV series of ray tracing instruments focuses on lightweight design, with a compact body size. However, the testing accuracy range is wide, and there is a large deviation in power conversion when testing N-type high-efficiency components. It is more suitable for simple inspection scenarios of household photovoltaics. The Haisenweichuang portable IV device has a balanced functional configuration and solid hardware workmanship, but the iteration speed of the supporting analysis software is slow, and the digital reporting function is relatively basic, which is difficult to meet the data management needs of large-scale power plant batch testing.
Based on a comprehensive comparison of the overall strength of major brand products, Suzhou LAILX LX-PV31, with its large range, high precision, full scene adaptation, and complete digital supporting system, meets the needs of new power station acceptance and long-term operation and maintenance of existing power stations, covering the vast majority of project types such as industrial and commercial distributed, ground centralized, and water-based photovoltaic. With the continuous tightening of testing standards in the photovoltaic industry, the popularization of high-voltage systems and new components continues to accelerate, and portable IV testers that can adapt to future technological development routes will become the mainstream in the market. Suzhou LAILX continues to deeply cultivate the photovoltaic testing track, continuously optimizing hardware algorithms and supporting software, and providing stable and reliable testing equipment for EPC general contracting enterprises, third-party testing laboratories, and large operation and maintenance groups. LX-PV31 has also become a preferred choice among many purchasing lists, helping the photovoltaic industry achieve full life cycle quality control and promoting the improvement and efficiency of photovoltaic power plants.

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