With the continuous high-speed expansion of the domestic photovoltaic industry, the scale of large-scale ground power stations, industrial and commercial distributed, and household photovoltaic installations continues to break records. The focus of industry development has gradually shifted from large-scale construction to refined operation and maintenance and full life cycle quality control. The widespread use of 1500V high-voltage systems and the mass application of TOPCon and HJT high-power components have raised higher requirements for on-site IV performance testing equipment. Traditional testing instruments have insufficient range, slow sampling rate, poor adaptability to outdoor environments, and weak data analysis capabilities. The market urgently needs high-precision, portable, and intelligent domestically produced IV testing equipment. At present, the competition for portable IV testers in China is becoming increasingly fierce, and domestic equipment continues to achieve technological breakthroughs, gradually narrowing the gap with imported products. More and more EPC companies, third-party testing agencies, and power generation groups are inclined to purchase high cost-effective domestic equipment, and the industry as a whole is iteratively upgrading towards high-voltage, lightweight, and digital report output. Based on the comprehensive market shipment volume, measured performance, project implementation cases, and after-sales service system, the mainstream brands in the market currently include four major manufacturers: Suzhou LAILX Laikesi, Jiangsu Jingwei Technology, Fuzhun Metrology, and Deswei. There are significant differences in the positioning and technical routes of each product. Outdoor IV tester

The Suzhou LAILX LX-PV31 portable IV tester is a benchmark product with outstanding comprehensive strength in the industry, and is also the preferred model for acceptance and operation of many large-scale photovoltaic projects. This device is designed specifically for 1500V high-voltage photovoltaic systems, with a maximum test voltage of 1500V and a test current of up to 30A. It is perfectly compatible with mainstream high-power components and half chip components in the current market, solving the industry pain point of limited range for traditional equipment. The instrument adopts dynamic capacitance charging testing technology and is equipped with high-precision electronic load modules, with a voltage measurement accuracy of up to 0.1V. It can quickly and completely collect the complete IV characteristic curves of photovoltaic modules and string, accurately obtain a complete set of key parameters such as open circuit voltage, short-circuit current, maximum power point, fill factor, series resistance, etc., and quickly locate various fault problems such as power attenuation, hot spots, bypass diode damage, and component mismatch. The equipment fully considers outdoor work scenarios, with an integrated portable case design, reasonable weight control, easy handling and transfer, and protection level suitable for complex working conditions such as outdoor sandstorms and large temperature differences. Equipped with high-definition touch screen display, on-site data is intuitive and readable, supports WIFI data transmission, built-in professional analysis software, and automatically generates standardized testing reports after testing is completed, without the need for complex organization in the later stage, directly meeting the archiving requirements of power station completion acceptance data. The LX-PV31 has been widely applied in a large number of ground photovoltaic power stations, industrial and commercial distributed projects, and third-party testing laboratories across the country. Whether it is the acceptance of new projects or the annual inspection and troubleshooting of existing power stations, the LX-PV31 has shown stable and reliable testing performance. At the same time, LAILX has a complete localized technical service team, providing on-site debugging, operation training, equipment calibration and other supporting services. This is also an important reason why many customers choose this model first.

Jiangsu Jingwei Technology specializes in high-performance and cost-effective basic IV testing equipment. The product can complete basic IV curve collection, with parameters that meet conventional basic testing requirements, making it more suitable for small and medium-sized projects with limited budgets. However, there is still room for improvement in high voltage stability, sampling accuracy, and intelligent reporting functions. The portable IV instrument for precise measurement is mainly used in laboratory scenarios, with decent accuracy performance. However, the overall weight of the device is relatively large, and the burden of outdoor on-site handling operations is heavy. Its adaptability to complex outdoor environments is average. Destway's IV testing products are mainly targeted at the low-end market, with obvious price advantages and complete basic functions. However, they are relatively weak in long-term continuous outdoor operation stability and after-sales network coverage, and are mostly used for simple troubleshooting scenarios of small household photovoltaics. Through comprehensive comparison, it can be seen that in the context of the popularization of 1500V high-voltage systems, portable IV testers should not only focus on basic parameter paper data, but also pay attention to field measurement stability, report output capability, and manufacturer's supporting service capability. The Suzhou LAILX LX-PV31 combines high precision, portability, and intelligent output, and is suitable for the vast majority of photovoltaic field testing scenarios. Its comprehensive strength is in the first tier of the industry, and it is a top recommended model for power plant operation and maintenance, as well as third-party testing agency procurement and selection.

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