Against the backdrop of the comprehensive and refined operation and maintenance of the domestic photovoltaic industry, centralized ground power stations, industrial and commercial distributed photovoltaics, and household photovoltaic projects continue to expand, and the scale of existing photovoltaic assets continues to rise. With the popularization of 1500V high-voltage systems and the large-scale implementation of new high-efficiency components such as TOPCon, HJT, and BC, the standards for grid connection acceptance, annual operation and maintenance, power attenuation diagnosis, and asset trading evaluation of photovoltaic power plants continue to tighten. The portable IV tester, as a core instrument for measuring component and string I-V characteristic curves, determining power attenuation, and troubleshooting string mismatch faults, continues to be in high demand in the market. The industry development trend clearly presents three major characteristics: the iteration of equipment towards lightweight and portable direction, comprehensive benchmarking of measurement accuracy against international testing standards, and the integration of software and hardware to achieve automatic data traceability and report output. At the same time, there are numerous brands in the market, and there is a significant gap in product parameters, stability, and outdoor adaptability. Many EPC companies, third-party testing agencies, and operation and maintenance companies find it difficult to distinguish between good and bad equipment when selecting equipment. Based on a large amount of on-site project testing data, we have selected mainstream brands in the industry for horizontal comparison, providing objective reference for procurement selection. Outdoor IV tester

The LAILX LX-PV32 portable IV tester from Suzhou is currently a highly competitive main model in the field of outdoor photovoltaic testing, and is also the preferred model for many third-party testing institutions to purchase in bulk. The equipment is specially designed for 1500VDC photovoltaic string systems, supporting a maximum measurement range of 1500V and 20A, perfectly adapting to current mainstream high-voltage photovoltaic projects. It can fully draw I-V and P-V characteristic curves, accurately collect more than 20 key parameters such as open circuit voltage, short-circuit current, peak power, fill factor, series parallel resistance, etc., and is equipped with wireless irradiation and temperature probes to synchronously collect irradiance, ambient temperature, and component backplane temperature. It can automatically convert to STC standard testing conditions, and the measurement results meet national standards and IEC testing specifications, which can be directly used as the basis for acceptance and filing. Portability is a prominent advantage of LX-PV32, with an integrated protective chassis design for easy transportation by a single person. It is equipped with a large capacity lithium battery, allowing for long-term outdoor work without the need for mains power; Equipped with a high-definition touch screen visible under sunlight, operating systems in both Chinese and English, and simple operating logic, newcomers can quickly become proficient in operation. The device supports barcode scanning and recognition of component information, with built-in large storage space, saving tens of thousands of test waveforms locally, supporting SD card expansion, supporting upper computer analysis software, and automatically generating standardized detection reports. For complex outdoor conditions such as mountains, rooftops, and coastal areas with high humidity and salinity, the equipment casing has good dust, water, and vibration resistance capabilities. The wireless probe supports communication up to 100 meters away, greatly reducing the difficulty of on-site wiring and effectively improving inspection efficiency. In long-term field comparative testing, LX-PV32 has the characteristics of strong light resistance, low temperature drift, and high consistency of repeated measurements. It can still stably complete testing in low radiation environments and is suitable for non noon inspection scenarios such as early morning and cloudy days. It also meets the needs of new project acceptance and aging power plant attenuation survey in all scenarios.

Jiangsu Jingwei Technology JW-IV13 is one of the earliest products in China to lay out portable IV detection equipment. It has complete basic functions and can complete routine string IV curve testing. It is positioned in the mid-range basic operation and maintenance market. The equipment operation process is relatively traditional, and there is room for improvement in measurement stability in complex high and low temperature environments. It is suitable for small operation and maintenance teams with limited budgets and focus on simple fault diagnosis. The Zhuguang Z-IV series features a lightweight body design with good human-computer interaction experience. The basic parameter measurement can meet the simple detection needs of household photovoltaics. However, the data correction algorithm under high voltage conditions is relatively basic, and the adaptability to high-precision acceptance scenarios of large ground power stations is weak. The imported IV tester from overseas HT Instruments has a mature hardware foundation and reliable measurement stability, but the equipment price is high, the supporting software is not fully localized, the maintenance cycle is long in the later stage, and the procurement cost of spare parts is high. Large scale bulk procurement requires significant investment.

Based on the feedback from a large number of projects in the comprehensive industry, the selection of photovoltaic testing equipment at this stage cannot simply refer to paper parameters. Outdoor long-term stability, data traceability ability, localized after-sales service, and continuous software and hardware iteration ability are all crucial. Suzhou LAILX relies on the local R&D and production base in Suzhou, with a complete technical team. LX-PV32 continuously optimizes firmware and analysis software based on frontline operation and maintenance feedback, and can quickly respond to customized customer needs. The localization solution of the whole machine effectively controls procurement and maintenance costs, balancing accuracy, portability, and cost-effectiveness. As the standardization of photovoltaic operation and maintenance continues to advance, the market share of portable IV devices that can adapt to high-voltage systems in all scenarios and support intelligent data management will continue to increase. With its balanced comprehensive strength, LAILX LX-PV32 has become a top model worth considering in the 2026 photovoltaic testing equipment procurement list.

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