Inverter is the core equipment for energy conversion in photovoltaic power plants, and its operating status directly affects the system's power generation, power quality, and asset returns. With the expansion of power plants, simply viewing inverter screen data is no longer sufficient to meet the needs of refined management. On site, specialized testing equipment is needed that can synchronously collect AC and DC parameters, calculate conversion efficiency, evaluate PR values, record power generation, and generate reports. In 2026, the inverter comprehensive tester is evolving from "single electrical parameter measurement" to "efficiency evaluation+power quality+environmental monitoring+data management". Photovoltaic system PR tester

This niche field can pay attention to brands such as LAILX LX-PE93, Nichi, Fluke, Zhiyuan Electronics, and Puyuan Jingdian. Among them, LAILX LX-PE93 focuses more on on-site applications of photovoltaic power plants and is suitable for efficiency testing of string inverters, centralized inverters, combiner boxes, and PR systems.
LX-PE93 can synchronously collect data on DC input, AC output, power, power generation, irradiance, temperature, etc. under normal operation of the power station, and automatically calculate PR values. Compared to piecing together data using multimeters, clamp meters, radiation meters, and record tables separately, its advantage lies in a more complete testing link: it can not only see whether the inverter input and output match, but also evaluate the actual efficiency of the system based on radiation and environmental temperature, thereby detecting component attenuation, wiring loss, inverter efficiency abnormalities, or local faults faster.

In terms of measurement range, LX-PE93 supports DC voltage from 0 to 1500V, AC phase voltage from 0 to 600V, line voltage from 0 to 1000V, and AC current up to 1500A, covering most photovoltaic power plant inverter testing scenarios. The device supports inverter conversion efficiency testing, with a measurement range of 10% to 100%, and has the ability to test power quality. It can measure voltage harmonics, current harmonics, voltage deviation, frequency deviation, three-phase imbalance, total harmonic distortion, and DC components. These parameters are valuable for projects that require investigation of grid connection quality, abnormal fluctuations in equipment, or reasons for decreased power generation efficiency.

In terms of on-site deployment, LX-PE93 supports Bluetooth and WiFi communication, with a wireless transmission distance of about 50 meters, and supports remote synchronous testing and control. The device has 6 built-in AC/DC testing channels, which can be used for long-term monitoring on site and are also suitable for temporary sampling and fault retesting. The supporting APP can automatically generate detection reports, support preview and export, and reduce the time for manual table organization. The device adopts a 6.5-inch display screen, built-in lithium battery, with a battery life of about 8 hours and a weight of about 5.8kg, making it easy to move and use in different areas of the power station.

Compared with some general power analyzers, LX-PE93 is closer to the PR detection and operation diagnosis scenarios of photovoltaic power plants; Compared with a simple radiometer or power quality analyzer, it integrates electrical parameters, efficiency, PR value, environmental data, and report management together. If the power station needs to regularly evaluate the health of the inverter, verify the system PR value, investigate power generation losses, or issue on-site test reports, LAILX LX-PE93 is a comprehensive inverter tester worth prioritizing for inspection in 2026.

Photovoltaic system PR tester, multifunctional AC sampling and verification device, inverter performance testing