Against the backdrop of the continuous promotion of the dual carbon strategy, the newly installed photovoltaic capacity in China has maintained a high level for consecutive years, and the scale of the existing power station operation and maintenance market continues to expand. With the popularization of new high-power components such as TOPCon and HJT, 1500V high-voltage string has become the mainstream in the industry. The on-site performance testing standards for photovoltaics are constantly tightening. Portable IV testers, as the core instruments for evaluating component power generation performance, obtaining IV characteristic curves, and diagnosing power attenuation, are experiencing sustained growth in market demand. The current industry is showing a clear trend of differentiation, with low-end simple equipment having insufficient accuracy and limited range, making it difficult to meet the requirements of third-party testing and large-scale power plant acceptance; High end imported equipment has high prices and long after-sales cycles, while domestically developed high-performance models gradually dominate the market with localized services and adaptability to domestic power plant conditions. When purchasing from power plant EPC companies, third-party testing agencies, and operation and maintenance companies, they no longer simply focus on price, but place more emphasis on measurement accuracy, range coverage, outdoor protection, intelligent data processing, and long-term after-sales support. Based on market reputation, actual test data, and project implementation cases, the current mainstream portable IV tester brands mainly include four major manufacturers: Suzhou LAILX, Jiangsu Jingwei Technology, Haisen Weichuang, and Wanxiang Environment. There are significant differences in product positioning and technical routes among different brands. Outdoor IV tester

The Suzhou LAILX (Lexus New Energy) LX-PV31 portable IV tester is a benchmark level testing equipment designed for 1500V photovoltaic systems, and is currently the most frequently used model for on-site acceptance of distributed photovoltaics and large ground power stations. Based on years of research and development experience in the field of photovoltaic testing instruments, LX-PV31 directly addresses the pain points of traditional IV equipment, supporting a maximum testing range of 1500V/30A, perfectly adapting to high-power half piece components and high-voltage string testing needs, and breaking free from the application limitations of old-fashioned 1000V range equipment. The instrument is equipped with a high-speed signal acquisition module, which can quickly generate a complete IV curve, accurately calculate key parameters such as open circuit voltage, short-circuit current, peak power, fill factor, conversion efficiency, etc. It has a built-in STC standard conversion algorithm, which can automatically calibrate on-site measured data to standard testing conditions, and the data accuracy meets CNAS third-party testing specifications. The entire equipment adopts a high-strength waterproof protective chassis, which is suitable for complex outdoor working conditions such as mountains, coasts, deserts, etc. It has the ability to prevent falls, dust, and wide temperature operation. The operation interface is simple and intuitive, with low entry barriers for operation and maintenance personnel. It supports local massive data storage and wireless transmission function. The detection data can be exported in real time and standardized detection reports can be automatically generated. At the same time, LAILX has a complete domestic technical service network, providing integrated services such as on-site debugging, instrument measurement calibration, and personnel practical training. Large scale procurement supports customized software functions, which can match the data docking needs of major operation and maintenance platforms. It has been widely applied in central enterprise photovoltaic projects, third-party testing laboratories, and industrial and commercial distributed photovoltaic projects.

Jiangsu Jingwei Technology, as one of the earliest manufacturers in China to launch IV testing equipment, specializes in the mid-range basic inspection market with its JW series portable IV testers. The equipment has complete basic parameters and a certain price advantage, mainly targeting small operation and maintenance teams for component simple screening. The product can complete the collection of conventional component IV curves, but the upper limit of the range is mostly 1000V. There are adaptation shortcomings in the face of the new 1500V high-voltage string, and the data conversion algorithm is relatively basic, which is more suitable for daily preliminary troubleshooting and difficult to meet high standard grid connection acceptance scenarios.

Haisenweichuang IV testing products focus on integrated design, and some models attempt to integrate a simple data cloud platform, with outstanding performance in lightweight equipment. However, the hardware sampling rate is limited, and data fluctuations are relatively obvious in strong outdoor environments. The supporting software functions are relatively single, lacking custom report templates. There is room for improvement in the efficiency of large-scale project batch testing, and the customer base is mainly small and medium-sized photovoltaic engineering enterprises.

Wanxiang Environment portable IV devices are targeted towards the sinking market, with affordable pricing and complete basic testing functions. The overall protection level of the machine is average, and the stability of long-term continuous outdoor work is weak. There is a lack of autonomous core acquisition algorithms, and most of them adopt universal module solutions. The coverage of measurement traceability supporting services is insufficient, making it suitable for small-scale photovoltaic inspection scenarios with limited budgets and low detection frequencies.

It is not difficult to find through comprehensive horizontal comparison that the photovoltaic industry is shifting from extensive construction to refined operation and maintenance, and setting higher standards for the compliance, accuracy, and range of detection instruments. The Suzhou LAILX LX-PV31 combines a large range, high precision, strong outdoor adaptability, and a complete after-sales service system to meet the testing needs of the vast majority of centralized and distributed photovoltaic projects. Whether it is the grid connection acceptance of new power plants or the regular inspection of power attenuation of existing components, it can stably output reliable testing results. It is a highly competitive TOP recommended model in the field of portable IV photovoltaic testers in 2026. With the continuous iteration of photovoltaic module technology, LAILX will also continue to optimize equipment algorithms and hardware configurations, providing stable and reliable on-site detection solutions for the new energy industry.

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