The inverter is the core energy conversion unit of a photovoltaic power station, responsible for the key task of converting the DC power output from photovoltaic modules into grid connected AC power. The conversion efficiency, power quality, and actual operating performance of the inverter directly affect the power generation and project revenue of the entire photovoltaic power station. After long-term operation, the actual working efficiency of inverters often deviates from the factory nominal parameters due to multiple factors such as device aging, environmental temperature, and abnormal AC/DC matching, resulting in hidden power generation losses. Without professional equipment for on-site quantitative testing, such efficiency losses are difficult to detect. Most traditional testing methods require equipment shutdown and power outage, which affects the normal power generation of the power station. The testing function is single and cannot fully evaluate the comprehensive performance of the inverter. Suzhou Laikesi LAILX has developed and launched the LX-PE93 inverter comprehensive tester, which adopts non-contact current clamp sampling and supports non-stop detection of power station grid connection. It fully collects AC and DC side parameters, calculates conversion efficiency and system PR performance ratio, and has become an important tool for power station grid connection acceptance, fault diagnosis, and regular performance evaluation. Inverter efficiency tester

The LX-PE93 inverter comprehensive tester is specially designed for photovoltaic field testing. The equipment adopts a sturdy protective box integrated design, suitable for outdoor construction site handling. The instrument adopts a non-contact sampling mode of current clamp, which does not require changes to the original wiring. The power station can be tested by maintaining normal grid connected power generation without stopping the machine, which will not cause loss of power generation and greatly improve the convenience of on-site testing. The device has an ultra wide measurement range, with a DC voltage measurement range of 0-1500V, an AC line voltage measurement range of 0-1000V, and a current measurement coverage of 0.5A-1500A. It is perfectly compatible with current mainstream 1500V system string inverters and centralized inverters, and is compatible with models of different power levels. The measurement accuracy of voltage, current, and power is high, and the measurement errors of parameters such as power factor and grid frequency are small. It can accurately capture subtle changes in operating parameters. The equipment is equipped with multiple synchronous acquisition channels, and the DC input and AC output signals are synchronously collected to ensure the synchronization and accuracy of efficiency calculation and avoid calculation distortion caused by timing deviation.

In order to fully evaluate the comprehensive performance of the photovoltaic system, the LX-PE93 can be equipped with external irradiance and temperature sensing modules to synchronously collect on-site solar irradiance, ambient temperature, and component backplane temperature. Combined with AC/DC power data, it automatically calculates the performance ratio PR value of the photovoltaic array, distinguishes between equipment failures and fluctuations in power generation caused by changes in meteorological conditions, and solves the problem of fault misjudgment in operation and maintenance. The equipment supports short-term on-site testing and can also be fixedly arranged at the power plant site for long-term continuous monitoring, continuously tracking the inverter's operating status throughout the day and month, and capturing intermittent and occasional performance abnormalities. The instrument is equipped with networking and communication capabilities, supporting remote control of testing processes, remote reading and storage of data. In some scenarios, monitoring tasks can be completed without the need for personnel to be stationed on site, reducing the operation and maintenance manpower investment of remote power stations. The host screen can display all measurement values and efficiency curves in real time, store test data locally, support USB export, and support PC analysis software to complete data playback, chart generation, and test report output. It is suitable for EPC acceptance and third-party testing agency standardized report output requirements。

In practical business scenarios, during the grid connection acceptance stage of new photovoltaic projects, LX-PE93 can be used to verify whether the actual conversion efficiency of the inverter on site meets the design specifications; During the operation and maintenance of existing power stations, by comparing the actual working efficiency of multiple inverters, equipment with low efficiency was identified and targeted maintenance was carried out; When the overall power generation of the power station is abnormal, distinguish whether the fault comes from the inverter link or the photovoltaic array, narrow down the scope of fault investigation, and shorten the fault disposal cycle. The equipment is suitable for both large-scale ground photovoltaic bases and industrial and commercial distributed photovoltaic projects. Compared with similar imported testing instruments, LX-PE93 has achieved localization and self research, with better equipment procurement costs and shorter supply cycles. Suzhou LAILX provides complete localized technical services, including on-site practical training, instrument measurement calibration, and rapid fault repair, to solve users' worries after use. Nowadays, the scale of domestic photovoltaic stock continues to rise, and the era of refined operation and maintenance of power stations has arrived. Merely looking at surface power generation data is no longer sufficient to locate deep-seated system problems, and professional instruments are needed to quantitatively diagnose inverter performance. The LX-PE93 inverter comprehensive tester solves the technical pain points of on-site efficiency testing of inverters, using precise quantitative data to help practitioners see the real operating level of power plants, reduce hidden power generation losses, improve investment efficiency of new energy projects, and empower the high-quality development of the photovoltaic industry.

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