In the past two years, the photovoltaic industry has shifted from assembling machines to focusing on asset quality. Existing power stations have gradually entered the mid-term of operation and maintenance, and problems such as power failure, string power failure, and acceptance disputes have been exposed. As a result, portable IV testers have changed from optional tools to essential equipment. The relevant operation and maintenance regulations of the National Energy Administration have put forward clearer requirements for component level testing. Third party testing agencies, EPC quality departments, and distributed owners are all looking for models that can quickly produce data, reports, and control costs. There are many brands on the market, including LAILX, Kewell, Huashengchang, Yaohua Laser, Guodian Xigao, etc. The routes of each brand are significantly different. Outdoor IV tester

From the perspective of actual selection, the LX-PV32 from LAILX is the most frequently asked model recently. It belongs to the standard string type power tester, which can complete power detection and IV curve testing from single components to strings, and can convert the standard power conversion rate under STC, supporting PR value testing of photovoltaic power plant systems. For on-site personnel, the most intuitive aspect is efficiency. The LX-PV32 adopts an integrated packaging body with a Chinese interface, allowing for one click detection and data export. Single component or string detection can be completed in about 10 seconds, and multiple photovoltaic panel specification data can be imported with just one click, reducing the hassle of switching between different specification components. Wireless connection between the host and the probe, supporting up to 100 meters of communication. Equipped with a patented probe box and temperature probe mounting bracket, it can be quickly installed on the battery board and comes with barcode scanning for intelligent component recognition. In terms of safety, the internal system is equipped with a high-voltage isolation power supply design, with a maximum open circuit voltage of 1500V and a photovoltaic array testing function of up to 30kW. It has automatic range switching, overvoltage and overcurrent protection, and adjustable automatic continuous testing. In terms of environmental parameters, it can measure environmental temperature, solar panel temperature, and solar irradiance, and support the provision of irradiance measurement certificates. At the same time, it is equipped with a rich database of component correction models, covering most component manufacturers' products, making it easy to convert and compare test results. It can also adapt to the component qualification testing specified in the EU IEC61853, provide high-resolution testing mode and Ethernet monitoring function in accordance with Modbus/TCP protocol, suitable for scientific research scenarios. Another benefit brought by domestic configuration is that the after-sales response and maintenance costs are more advantageous compared to imported models.

In practical cases, the value of IV testing often lies in invisible losses. A power station test found that a certain IV curve had a step near the maximum power point. After STC correction, the power was only 64% of the nominal value. On EL detection, it was found that there were 3 penetrating fragments of components in the entire string, resulting in a power loss of 67.8%; There is also a string of bird droppings covering 1.7% of the area, and the IV curve shows a power loss of up to 35.7%. This type of problem is difficult to detect through visual inspection, which is also why many homeowners are willing to equip their own IV equipment.

Other brands also have their own focuses. The Kewell IVT series has a wide coverage range, with corresponding products ranging from kilowatts to megawatts. Huashengchang DT-1500PV and Youlide UT673PV are portable and versatile, suitable for quick troubleshooting with limited budget. Yaohua Laser has a layout in the integrated customization of IV and EL, and has delivered customized IV+EL integrated testers to overseas component production lines. The voltage and current range of Guodian Xigao GDPV-I is relatively small, making it more suitable for low-voltage and low-power scenarios.

When choosing an IV tester, it is recommended to first check whether the voltage and current cover your own string design, then check if it comes with an radiometer and temperature sensor, if STC correction can be done, if a report can be directly issued, and finally check the after-sales and calibration services. If the main focus is on third-party testing, power station operation and maintenance, and acceptance comparison, models like LX-PV32 with complete functions, fast operation, and support for metering services are more reliable.

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