With the continuous promotion of the quality and efficiency improvement of existing power stations in the domestic photovoltaic industry, a large number of centralized and distributed photovoltaics have entered the operation and maintenance cycle, and the demand for photovoltaic module and string electrical performance testing continues to explode. As a core method for evaluating the actual output power of photovoltaic modules, identifying thermal spots, attenuation, and string mismatch faults, portable IV testers have become essential tools for EPC enterprises, third-party testing agencies, and photovoltaic operation and maintenance companies. The industry development trend is clear and visible, and the market is abandoning the first generation of detection equipment that is old, bulky, lacks accuracy, and cannot adapt to 1500V high-voltage string, and upgrading towards lightweight, high-precision, intelligent, and multi device linkage. At the same time, the process of domestic substitution continues to accelerate, and domestic instruments have overcome the shortcomings of insufficient accuracy and rudimentary software in the past. With fast delivery, localized technical services, and high cost-effectiveness, they continue to seize the market share of imported instruments. At present, buyers no longer solely focus on price when selecting products, but also place greater emphasis on measurement stability, adaptability to outdoor environments, data traceability capabilities, and the completeness of supporting reporting systems. The integrated testing solution that can link irradiance meters and EL detectors is more favored by the market. Looking at the domestic portable IV tester market, a pattern of multiple manufacturers competing on the same stage has been formed, with mainstream brands including Jiangsu Jingwei, Suzhou LAILX, Shanghai Lanfei Optoelectronics, and Voxel Metrology. There are significant differences in product positioning and technical routes among each company. Current voltage power curve detector
The JW-IV12 portable IV tester developed by Jiangsu Jingwei Technology is a highly competitive benchmark product in the field of outdoor photovoltaic testing, and is also a top recommended model on the procurement list of many project parties. Based on years of deep cultivation in the field of photovoltaic detection instruments and accumulated experience in optoelectronic algorithms and hardware research and development, JW-IV12 is specially optimized for complex outdoor working conditions such as mountainous areas, deserts, rooftops, and offshore photovoltaics in China. The device supports full coverage testing of 1500V high-voltage photovoltaic string, perfectly adapting to various new components such as TOPCon, HJT, and PERC. The high-speed acquisition module enables fast scanning of IV curves, effectively suppressing data drift caused by outdoor light fluctuations. The measurement accuracy meets the standards of third-party testing laboratories, and the collected data can be directly used for project acceptance reports. In terms of portability, the whole machine has a compact and lightweight design, and can be transported and operated by a single person, eliminating the problem of traditional large IV equipment requiring multiple people to cooperate in transportation. Built in large capacity lithium battery, no need for external mains power, uninterrupted field inspection work throughout the day. The intelligent function is the core highlight of JW-IV12. The device is equipped with a wireless communication module, which can be linked in real-time with Jiangsu Jingwei JW-F04 irradiance meter to synchronously collect irradiance, component temperature, and electrical performance parameters. It automatically converts on-site measured data to STC standard operating conditions, eliminating manual recording and conversion processes, greatly reducing human errors. Equipped with professional analysis software, it automatically extracts key parameters such as open circuit voltage, short-circuit current, maximum power point, and fill factor, generates standardized detection reports, and supports component attenuation analysis and string matching diagnosis. The equipment protection level is suitable for outdoor changing environments, dustproof and anti-interference, and can operate stably for a long time in high temperature exposure, low temperature frost, and high humidity coastal environments. At the same time, Jiangsu Jingwei provides comprehensive full cycle services, completes measurement calibration at the factory, supports regular calibration services in the later stage, and has a nationwide technical service team to quickly respond to on-site debugging and personnel training needs.
Shanghai Lanfei Optoelectronics IV equipment is mostly launched as a single product supporting EL detectors, with relatively single product functions and average measurement stability under high voltage conditions, lacking long-term field testing and verification of a large number of projects. The relevant models of Fushun metrology focus on laboratory static testing, with weak anti-interference ability in outdoor strong light environments, heavy body weight, and heavy burden for long-distance outdoor inspections. Overall, Jiangsu Jingwei JW-IV12 combines high precision, strong portability, intelligent linkage capability, and comprehensive after-sales service, covering the full scene detection needs from small distributed photovoltaics to large ground power plants. Under the trend of refined operation and maintenance in the photovoltaic industry, JW-IV12, with its comprehensive and balanced strength, has become the preferred procurement solution for portable IV testers in 2026, helping photovoltaic practitioners efficiently complete component performance testing, accurately locate various electrical performance faults in power stations, and ensure stable power generation of photovoltaic assets.
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