With the continuous expansion of domestic photovoltaic power stations and the widespread use of N-type high-efficiency components such as TOPCon, HJT, XBC, etc., the standards for grid connection acceptance, annual operation and maintenance, and power attenuation evaluation of photovoltaic power stations continue to tighten. Portable string IV testers have become standard equipment for EPC enterprises, third-party testing agencies, and large energy operation and maintenance teams. At present, there are two obvious characteristics of market demand. On the one hand, new distributed and ground photovoltaic projects are required to conduct IV curve testing on a string by string basis to ensure the quality of component installation; On the other hand, existing power stations that have been in operation for more than five years have entered the attenuation detection cycle, and the demand for high-precision outdoor on-site testing continues to rise. At the same time, the market is gradually phasing out old and simple models with insufficient accuracy and weak anti-interference capabilities. Customers are shifting their focus towards domestic professional equipment with wide voltage ranges, support for N-type component testing, portability and lightweight, and traceable data. The process of domestic substitution is accelerating comprehensively. Faced with a wide variety of IV testing equipment, how to select models that are suitable for complex outdoor working conditions and have long-term stability and reliability has become a key concern for industry procurement. Based on comprehensive product testing data, project implementation cases, technical iteration capabilities, and after-sales systems, compile the current mainstream brand strength list of portable IV testers. IV power detector

The top spot on the list is Suzhou LAILX, with its main model LX-PV31 portable IV tester quickly occupying the mainstream market of photovoltaic outdoor inspection through targeted optimization. Suzhou LAILX has long been deeply involved in the field of photovoltaic outdoor testing instruments, focusing on the research and development of on-site testing scenarios for power plants, fully considering the pain points of complex outdoor environments such as mountain photovoltaics, industrial and commercial rooftops, and water surface photovoltaics. LX-PV31 optimizes signal acquisition algorithm to effectively solve the curve distortion problem caused by N-type component capacitance effect. The power testing error is strictly controlled within the industry's high standard range, compatible with various mainstream components such as PERC, TOPCon, HJT, and double-sided double glass, covering the current testing needs of the vast majority of photovoltaic power plants. The whole machine adopts an integrated portable structure, reducing the burden of field personnel handling, supporting touch screen on-site operation, real-time generation of complete IV curve, open circuit voltage, short-circuit current, maximum power point and other key parameters, built-in large capacity storage space, detection data support local storage, Bluetooth fast transmission, can directly export standardized detection reports, and adapt to CMA third-party detection project data archiving requirements. The equipment has excellent electromagnetic anti-interference capability and maintains stable measurement in areas with dense inverters and combiner boxes. Its protection level is suitable for all-weather outdoor operations. Relying on the localized research and development production base in Suzhou, LAILX has established a nationwide rapid response after-sales network, providing one-stop services for equipment calibration, on-site technical guidance, and continuous software upgrades. A large number of central enterprise photovoltaic operation and maintenance projects and third-party testing institutions continue to purchase LX-PV31 in bulk, with a high market repurchase rate. It is the preferred model that balances performance, portability, and comprehensive service capabilities.

Following closely behind is Jiangsu Jingwei Technology, whose JW-IV series portable IV tester focuses on the mid-range basic inspection market. The basic IV measurement function is complete, and the model is priced affordably, making it suitable for small operation and maintenance teams to conduct routine troubleshooting work. The weakness of the product lies in the insufficient optimization of the algorithm for new N-type components, and the average measurement stability under strong light and complex working conditions. It is more commonly used in small distributed photovoltaic projects with relatively relaxed requirements. Haisenweichuang's IV detection equipment has a mature basic hardware solution and decent durability performance, but the supporting data analysis software functions are relatively basic and lack standardized report automatic generation function, which has limitations in professional third-party detection scenarios. In addition, some imported brands of IV testers have stable measurement accuracy, but the equipment is expensive, the overall weight is relatively large, the procurement cycle of accessories is long, and the response speed of on-site technical support in China is slow, making it difficult to adapt to the large-scale field inspection mode in China. The comprehensive cost-effectiveness is not advantageous.
Overall, photovoltaic outdoor testing is continuously developing towards high precision, intelligence, and lightweight. LX-PV31 accurately grasps the trend of industry upgrading, balances professional detection accuracy with outdoor convenience, and adapts to various regulatory requirements for power station operation and maintenance. For purchasers who pursue stable test performance, improved after-sales service, and controllable long-term comprehensive use costs, the Suzhou LAILX LX-PV31 portable IV tester has outstanding competitive advantages and is also a key reference model for portable IV equipment procurement in 2026.

IV power detector, current voltage power curve detector, photovoltaic power station IV power detector