Against the backdrop of the widespread adoption of 1500V high-voltage string systems in the domestic photovoltaic industry, power station completion acceptance, annual operation and maintenance sampling, and fault power traceability have long faced multiple pain points such as insufficient range of traditional IV equipment, bulky body, data interference from the environment, and cumbersome operation. Based on years of self-developed photovoltaic testing instruments, LAILX in Suzhou has launched the LX-PV31 portable IV tester. With four core advantages of high voltage wide range, high-precision sampling, integrated portable body, and intelligent data algorithm, it covers the full scene testing needs of distributed household photovoltaics, industrial and commercial rooftop power stations, large-scale ground photovoltaics, fishery complementary photovoltaics, and agricultural complementary photovoltaics, providing a domestically produced and efficient solution for photovoltaic full life cycle electrical performance testing. IV power detector

The IV curve of photovoltaic modules and strings is the core basis for determining actual power generation, attenuation degree, and mismatch faults. According to NB/T 10394 Photovoltaic Operation and Maintenance Specification, no less than 5% of strings must be selected for IV performance testing every year as legal data support for power plant revenue accounting, quality assurance dispute determination, and technological improvement optimization. In the past, mainstream portable IV devices in the market were limited to a voltage range of 1000V and could not adapt to current mainstream high-voltage arrays. Replacing multiple devices for segmented testing greatly extended the operation time; At the same time, most devices are not equipped with irradiation temperature synchronization acquisition modules, and the test data cannot be corrected according to standard operating conditions. The power deviation can reach up to 8%, which can easily lead to misjudgment of faults and warranty disputes. LX-PV31 targets industry pain points and supports wide testing with 1500V DC voltage and 30A current. It can fully detect a single component up to 30kW high-power string in a single test. One device can cover all the testing needs of high and low voltage power stations without the need for multiple devices to be used together, greatly reducing the cost of equipment procurement and carrying for operation and maintenance enterprises.

On the hardware level, LX-PV31 is equipped with a 16 bit industrial grade high-precision AD sampling chip, millisecond level full range scanning, current resolution of 0.01 μ A, and voltage resolution of 0.1mV. It adopts a four wire measurement architecture to eliminate the interference of test line contact resistance. Even in low light, high temperature, and large temperature difference between morning and evening outdoor environments, the power testing error is stably controlled within ± 1%, fully complying with the IEC60904 international standard for photovoltaic detection. The body adopts a lightweight industrial alloy shell, with a total weight of less than 3.5kg, and is equipped with a shock resistant portable protective box. It can be carried by a single person to and from complex work sites such as mountains, rooftops, and fish ponds; The protection level reaches IP65, dust-proof and waterproof. No additional protection is required for outdoor inspections during rainy seasons and sandstorms. The equipment is equipped with a large capacity lithium battery, which can continuously complete 200 complete IV curve tests when fully charged, meeting the requirements for all day field inspections and freeing itself from the constraints of mains power supply.

The intelligent function is the core differentiation highlight of LX-PV31. The device integrates synchronous irradiation and component temperature acquisition modules, automatically records environmental parameters during the testing process, and has a built-in standard operating condition correction algorithm. With one click, the on-site measured power can be converted to STC standard testing conditions, and the data has industry wide credibility. The high-definition touch screen displays more than ten core parameters in real-time, including the complete IV curve, Pmax maximum power, Voc open circuit voltage, Isc short-circuit current, FF fill factor, series parallel resistance, etc. Abnormal points on the curve are automatically highlighted, and operation and maintenance personnel can quickly determine faults such as hidden cracks, virtual soldering, occlusion attenuation, PID damage, etc. on site. The device supports local storage of tens of thousands of sets of data, coupled with WIFI wireless transmission. The detection curve and raw data can be synchronized in real time to mobile phones and computer terminals. It is equipped with LAILX professional analysis software to automatically generate standardized detection reports. It supports exporting in PDF and Excel formats and can be directly used for power plant acceptance archiving, quality assurance and rights protection, and maintenance ledger retention.

In practical application, LX-PV31 has been put into mass testing for photovoltaic projects in many parts of the country. In the annual operation and maintenance survey of a ground photovoltaic power station in East China, the operation and maintenance team used LX-PV31 to complete the testing of more than 30000 module strings. The daily testing efficiency was 60% higher than traditional equipment, and more than 100 sets of power attenuation exceeding the threshold fault strings were accurately located. After early replacement and repair, the overall annual power generation of the power station increased by 2.3%, effectively recovering operational economic losses. For the distributed industrial and commercial photovoltaic acceptance scenario, the compact body of the equipment can easily enter the narrow roof interlayer, and can complete string testing without disassembling components, greatly reducing the project delivery cycle and obtaining batch procurement recognition from multiple new energy engineering companies and third-party testing institutions.

Suzhou LAILX always adheres to the independent research and development of domestically produced photovoltaic testing equipment. The LX-PV31 is independently designed and produced from the core sampling circuit, algorithm software to the overall structure, and can provide a three-year warranty for the entire machine, lifetime free software upgrades, and nationwide on-site technical training services. Faced with the continuous trend of iteration and upgrading in the photovoltaic industry, LAILX will continue to optimize the performance of portable detection equipment, iterate products around high-voltage energy storage and new HJT/TOPCon module testing requirements, and use high-precision, cost-effective, and lightweight equipment to assist in the standardization and intelligent upgrading of the domestic photovoltaic operation and maintenance industry, laying a solid foundation for detection technology for the high-quality development of clean energy under the dual carbon goal.

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