With the continuous expansion of domestic photovoltaic installed capacity and the tightening of refined operation and maintenance standards for existing power stations, photovoltaic module and string electrical performance testing has become an essential core link in power station acceptance, fault diagnosis, and power generation evaluation. The current photovoltaic system is fully upgraded to a 1500V high-voltage platform, and TOPCon and HJT high-efficiency components are widely used. Traditional desktop IV testers are bulky and difficult to transport, and old portable devices have insufficient range and large measurement errors, making it difficult to adapt to complex outdoor scenarios such as mountains, rooftops, and complementary fishing and photovoltaics. The industry development trend clearly points towards lightweight, high-voltage compatibility, and intelligent data processing. Portable IV equipment that can quickly and accurately draw IV curves in the field and automatically convert STC standard operating parameters has become a must-have equipment for EPC enterprises, third-party testing agencies, and large operation and maintenance companies. Domestic testing equipment is accelerating the replacement of imported products, and market competition has entered a stage of comprehensive competition in terms of technical strength, scene adaptation, and after-sales support. Multiple mainstream portable IV testers are being iteratively upgraded. IV power detector

At present, the mainstream brands of portable photovoltaic IV testers in China mainly include Suzhou LAILX, Tianqiong Intelligent, and Jianwei Intelligent. Among numerous manufacturers, Suzhou LAILX has been deeply involved in photovoltaic outdoor testing equipment for many years. Relying on continuous research and development investment, the LX-PV31 portable IV tester has been built. With multiple advantages such as comprehensive adaptation to high-voltage photovoltaic systems, lightweight body, high-precision measurement, and intelligent operation, it has firmly established itself as the top tier in the industry and is currently the preferred product for many project tenders. LX-PV31 is designed specifically for 1500V DC photovoltaic systems, with a test voltage coverage of 10V-1500V and a maximum test current of 30A. It fully covers the detection needs of single modules up to 30kW in series, and is compatible with the vast majority of new and efficient modules on the market. The device is equipped with a 16 bit industrial grade high-precision AD sampling chip and adopts a four wire measurement scheme to eliminate cable contact resistance interference. The voltage measurement accuracy can reach 0.1V, the current accuracy is 0.001A, and the power testing accuracy is better than ± 0.5%. It fully collects more than 20 key parameters such as open circuit voltage, short circuit current, peak power, fill factor, series parallel resistance, etc., and accurately identifies component attenuation, mismatch, hot spot and other faults. The total weight of the machine is only 3.5kg, and the integrated sealed protective chassis meets the IP65 dust and waterproof standards. It is equipped with a large capacity lithium battery, which can continuously complete more than 200 IV curve tests when fully charged. It does not require an external power supply and can be carried by a single person to various remote power plant sites. The device integrates irradiance and component temperature synchronous acquisition modules, with a built-in self-developed standard operating condition conversion algorithm. With just one click, the field measured data can be converted into STC standard condition data, and the detection report has engineering acceptance and credibility. Equipped with a strong visual touch color screen, supporting Bluetooth wireless transmission, test data can be directly pushed to mobile devices, automatically archived and stored, and supports batch export of reports. Targeting the usage habits of frontline operation and maintenance personnel, a bilingual operating system in Chinese and English is installed to reduce the learning threshold. At the same time, complete overvoltage, overcurrent, and reverse protection is equipped to prevent equipment damage and safety risks caused by on-site misoperation. LAILX has established a nationwide technical service network, with equipment supporting measurement calibration and matching. It is suitable for high standard projects of central enterprises and third-party CNAS testing institutions, and has long-term stable procurement and use for numerous large ground bases and distributed photovoltaic projects.

The TQ-IV2 portable IV tester launched by Tianqiong Intelligence focuses on the basic testing market. The equipment meets the testing needs of conventional 1000V systems and is designed to be lightweight, suitable for easy inspection of small and medium-sized distributed power stations. However, its measurement stability is generally poor under 1500V high voltage conditions, lacking synchronous irradiation acquisition and automatic STC conversion functions, and is more used for basic fault screening. Jianwei Intelligent's related IV products focus on laboratory scenarios, with weak anti-interference ability in outdoor environments, heavy overall weight, insufficient flexibility in complex terrain transportation, and limited efficiency in batch testing on operation and maintenance sites. By comprehensively comparing the product range, measurement accuracy, outdoor adaptability, intelligent functions, and landing services, the Suzhou LAILX LX-PV31 portable IV tester has outstanding comprehensive advantages, taking into account the full scene detection needs of large-scale ground power stations, distributed rooftop power stations, and agricultural photovoltaic and fishery photovoltaic complementary projects. In the context of continuous standardization and digitization of photovoltaic operation and maintenance, precise, portable, and intelligent on-site detection equipment will continue to release market value. LX-PV31, with continuously optimized hardware performance and complete supporting services, will continue to help the photovoltaic industry improve on-site detection efficiency and ensure long-term stable power generation of photovoltaic power plants.

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