What is the Wet leakage current test system of photovoltaic module？

A Photovoltaic Module Wet Leakage Current Test System is a specialized piece of equipment designed to evaluate the electrical insulation and leakage safety of solar PV modules in humid or wet environments. By subjecting a PV module to specified conditions—such as exposure to moisture or water spray—and applying a defined test voltage, the system measures the leakage current or insulation resistance between the module’s live components and its accessible external surfaces. This process assesses the module's insulation integrity and electrical safety when exposed to environmental factors like rain or humidity.

Operating Procedure

Equipment Inspection: Verify that the power supply, test tank, water-spraying apparatus, high-voltage source, measurement system, and all connecting cables are functioning correctly. Ensure the equipment is properly grounded and that all safety protection mechanisms are operational. Sample Preparation: Select the PV module to be tested; inspect the surface, frame, junction box, and cable connections for any visible damage, and record the sample's basic information. Sample Installation: Place the PV module in the designated test area or water tank according to the test requirements, ensuring it is securely positioned so that the surfaces to be tested are fully exposed to the required humid or wet environment. Connecting Test Circuits: Connect the output terminals of the PV module to the test system, and attach the specified test electrodes to the module frame or other designated accessible conductive parts, following the instrument's wiring instructions. Configuring Test Parameters: Set the test voltage, water-spraying conditions, water temperature, water conductivity, and test duration in accordance with the applicable testing standards. Wetting Process: Activate the water-spraying or immersion system to bring the PV module's surface and the designated test area to the moisture level required by the standards. Applying Test Voltage: Under strict adherence to safety protocols, activate the high-voltage test system to apply the specified voltage to the PV module, thereby evaluating its electrical insulation performance in a wet state. Measuring Leakage Current: Use the current measurement system to monitor and record leakage current data in real time, observing the module for any signs of abnormal leakage. Analyzing Test Results: Calculate or evaluate the insulation resistance based on the measured data to determine whether the module's wet-state insulation performance complies with the relevant standard requirements. Upon completion of the test, turn off the high-voltage power supply. Ensure that the equipment has fully discharged—either automatically or manually—and verify that no residual hazardous voltage remains before disconnecting the test leads and removing the sample. Save and organize the test data, record the leakage current, insulation resistance, test voltage, and environmental conditions, and generate a test report.

Application Value

Ensures electrical safety by assessing the insulation performance of photovoltaic (PV) modules in humid environments, thereby evaluating the risk of current leakage and mitigating potential electrical hazards such as electric shocks or system failures. Enhances product quality by helping manufacturers identify latent defects in module encapsulation, insulation materials, and edge sealing, ultimately improving product consistency. Validates environmental adaptability by simulating real-world conditions—such as exposure to rain or moisture—to assess the insulation reliability of PV modules, providing a reference for long-term outdoor operation. Reduces operational risks by identifying modules prone to current leakage or insulation failure, thereby decreasing the likelihood of safety incidents and lowering maintenance costs for PV power plants. Supports product certification and quality assessment by providing technical data and a basis for standards-compliant testing, product certification, and factory-gate quality inspections. Facilitates product R&D and improvement by analyzing test results to pinpoint weaknesses in module structure, materials, or manufacturing processes, which informs design optimization and technological upgrades. Boosts market competitiveness by verifying product reliability through comprehensive wet leakage current testing, thereby strengthening customer confidence in the safety and durability of the modules.

Function

Detects wet leakage current by measuring the current leakage of PV modules under humid or water-sprayed conditions to identify any abnormal leakage. Evaluates insulation performance by assessing the electrical insulation capability of PV modules in damp environments, ensuring that the insulation between live components and accessible external surfaces meets required standards. Verifies electrical safety by applying specified test voltages to check for leakage risks in humid conditions, ensuring compliance with relevant electrical safety requirements. Simulates real-world operating environments by using water spray or humidity-based test conditions to replicate how PV modules perform when exposed to rain, moisture, or other damp environments. Identifies potential defects by examining module encapsulation materials, edge seals, junction boxes, and cable connections for issues that could compromise insulation performance. Assesses moisture resistance by evaluating the impact of moisture on the electrical insulation of the modules, providing a basis for structural design improvements and enhanced moisture protection. Ensures product quality by providing manufacturers and testing institutions with data on electrical safety under wet conditions, facilitating effective quality control.

Summary

The Wet Leakage Current Test System for Photovoltaic (PV) Modules is primarily designed to simulate the operating conditions of PV modules in rainy or humid environments. By applying a specified voltage and measuring leakage current or insulation resistance, the system evaluates the insulation performance and electrical safety of the modules under wet conditions. It enables the timely detection of potential insulation defects and helps mitigate the risk of electrical leakage, providing a reliable testing basis for the R&D, production quality control, and safety certification of PV modules.