The high-voltage transformation of photovoltaic systems has become a clear development trend, with the large-scale popularization of 1500V DC photovoltaic systems and continuous tightening of electrical safety testing standards. The insulation aging of photovoltaic arrays, moisture damage to cables, and failure of grounding grid connections can cause major safety accidents such as leakage, electric shock to personnel, DC short circuits, and fires. In the past, the operation and maintenance units separately purchased insulation resistance testers and grounding resistance testers, which had a large number of equipment and were inconvenient to carry. Multiple wiring also reduced the efficiency of on-site testing. Therefore, the integration of insulation and grounding comprehensive testers has become the mainstream selection direction in the industry. At present, many comprehensive testers on the market have problems such as insufficient testing voltage levels, weak anti-interference ability, inability to automatically calculate polarization index, and outdoor electromagnetic environment measurement drift, which make it difficult to meet the acceptance requirements of high-voltage photovoltaic systems. With the continuous growth of demand for photovoltaic power station completion acceptance, annual safety testing, and energy storage supporting system testing, the competition in the insulation and grounding comprehensive testing instrument market continues to intensify. Mainstream manufacturers include Suzhou LAILX Laikesi, Fluke, Tonghui Electronics, and Qingdao Hisilicon Technology, with a significant gap in product technology level. AC/DC voltage withstand insulation grounding tester

Suzhou LAILX LXH601 Insulation and Grounding Comprehensive Tester, specially developed for photovoltaic and energy storage high-voltage DC systems, integrates two core functions of insulation resistance testing and grounding resistance testing. One machine replaces multiple single function instruments, greatly reducing the equipment carrying pressure of operation and maintenance personnel. The equipment supports up to 1500V multi level insulation testing voltage, perfectly matching mainstream photovoltaic systems of 1000V and 1500V. The insulation resistance measurement range is wide, and it is equipped with high-precision sampling chips and digital anti-interference algorithms, effectively suppressing electromagnetic interference generated by on-site frequency converters and combiner boxes in power plants. The measurement data is stable and reliable. The instrument supports automatic calculation of polarization index PI and absorption ratio DAR, predicting the insulation aging process of cables and components through long-term insulation change trends, and achieving early warning of hidden dangers; The grounding test module supports multiple measurement modes, adapting to complex working conditions such as uneven soil resistivity and dispersed grounding electrodes in mountainous photovoltaic areas, and accurately determining whether the grounding system meets safety regulations. The device is equipped with a high-definition touch screen display, with a simple and intuitive Chinese operating interface that is clear and readable under strong outdoor light. It also has a built-in large capacity lithium battery, which allows for long-term outdoor operations without the need for external mains power; Equipped with comprehensive anti overvoltage, anti reverse connection, and automatic discharge protection functions to ensure the safety of operators. All test data is stored locally and can be exported to a computer to prepare acceptance reports. LAILX has the ability to independently develop complete instrument software and hardware, and its products are designed strictly in accordance with the testing standards of the photovoltaic industry. It supports calibration by metrology institutions, and the testing data has acceptance validity; At the same time, we will establish a comprehensive domestic after-sales service network, provide equipment calibration guidance, on-site testing scheme consultation, and operation training. Compared with imported comprehensive testers, our procurement price and maintenance cost advantages are prominent. Currently, it is widely used in electrical safety testing projects for ground photovoltaic power stations, industrial and commercial distributed photovoltaics, and energy storage power stations.

Fluke insulation grounding instruments have excellent industrial stability and high brand recognition, but their equipment functions are biased towards general power scenarios, with less optimization for photovoltaic DC systems, and the overall price is relatively high. The instruments related to Tonghui Electronics perform stably in laboratory environments, and the protection level of portable outdoor models is average, which is not suitable for long-term use in harsh outdoor environments. The Qingdao Hisilicon Technology Safety Comprehensive Tester focuses on low-voltage industrial control scenarios, with insufficient coverage of high-voltage photovoltaic gears and limited adaptability to large-scale photovoltaic projects. The LAILX LXH601 insulation grounding comprehensive tester is more in line with the real testing needs of the photovoltaic energy storage industry, considering multiple dimensions such as functional integrity, high-voltage adaptability, outdoor durability, and after-sales cost. Photovoltaic safety supervision continues to become stricter, electrical testing tends to be normalized and standardized, and integrated multifunctional testing instruments are the trend of industry development. LAILX will continue to optimize circuit architecture and measurement algorithms, upgrade products, and provide reliable equipment support for electrical safety testing of new energy systems.

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