Long Pulse IV Tester for PV Modules

The Long Pulse IV Tester for PV Modules utilizes millisecond to second-level long-pulse light sources to simulate continuous solar irradiation. It overcomes the capacitive and thermal effect errors inherent in traditional flash testers caused by excessively short pulses. This specialized equipment is designed for precisely measuring the complete current-voltage characteristic curve (IV curve) of photovoltaic modules (especially large-sized, bifacial, tandem, and other high-capacitance modules) under conditions close to actual power generation operation. It accurately calculates key performance parameters such as maximum power point (MPP), fill factor (FF), open-circuit voltage (Voc), and short-circuit current (Isc).

Product Features

• Long Pulse Light Source Simulates Real Conditions: Employs a 100ms long-pulse light source to effectively simulate continuous solar irradiation. Overcomes errors caused by capacitive and thermal effects in traditional flash testers due to short pulses, creating a test environment closer to the actual outdoor power generation state of modules.

• High-Precision Measurement of Key Parameters: Precisely measures the complete current-voltage characteristic curve (IV curve) of PV modules under near-real conditions. Accurately calculates core performance parameters including open-circuit voltage (Voc), short-circuit current (Isc), maximum power point (Pmax / MPP), fill factor (FF), and conversion efficiency, significantly enhancing data reliability.

• Wide Applicability for Various New Module Types: Particularly suitable for testing large-sized, high-capacitance modules (such as double-glass, bifacial, tandem/perovskite, HJT, TOPCon, and other new high-efficiency modules), as well as modules with significant thermal capacitance effects. Solves the problems of inaccurate or ineffective measurement with traditional flash methods on these modules.

• Integrated Temperature Monitoring & High-Efficiency Automation: Equipped with high-precision temperature sensors for real-time monitoring of module temperature. Temperature is used as a key variable for data calibration (typically to Standard Test Conditions - STC), ensuring result comparability. The device typically integrates automated robotic handlers and software control systems to achieve efficient, stable assembly line testing, enhancing production inspection efficiency.

Technical Specifications

Product Applications

• 1、 Quality Control at PV Module Production Line End: This equipment is a core tool for quality control at the end of the PV module production line. It performs rapid automated testing on every module coming off the line, precisely measuring power and other key parameters for binning. It provides reliable assurance, especially for accurately testing large-sized, bifacial, tandem, and other new high-capacitance modules.
• 2、 PV Module R&D and Performance Evaluation: In the PV module R&D phase, it is used to accurately evaluate the true performance of new cell technology, material, or structural samples. It provides IV curves under conditions close to actual operation, helping R&D personnel optimize designs and verify performance improvements.
• 3、 Third-Party Testing, Certification & Laboratory Precision Measurement: Widely used in national quality inspection centers, third-party certification laboratories, and enterprise precision testing labs. Provides a high-precision and authoritative measurement data foundation for module performance calibration, certification testing compliant with international standards, and arbitration of quality disputes.
• 4、 PV Power Plant Module Selection & Outdoor Field Performance Analysis: Serves the PV power plant sector for fine-grained comparison and selection of modules from different manufacturers and technology routes before construction. Also used for laboratory-level accurate retesting of long-term operational performance degradation of modules after outdoor field testing, providing critical data for investment decisions and reliability studies.

Precautions

• 1、 Strictly Adhere to Light Source Safety Protocols: The strong light pulses emitted by the equipment are high-energy and extremely bright. Never look directly at the light source or open the test chamber door during testing.

• 2、 Ensure Proper Grounding and Electrical Isolation: The equipment involves high voltage and high current output. It must be reliably grounded, and the power supply must meet specifications. Regularly inspect cable insulation.

• 3、 Precisely Control Test Environment Temperature and Humidity: Module performance is significantly affected by temperature. Pre-heat/pre-cool modules adequately to the set temperature (typically 25°C ±1°C) before testing, and precisely monitor module surface temperature in real-time (using calibrated contact sensors). Control ambient humidity within the specified range (typically <60% RH) to prevent condensation or high-voltage discharge risks.

• 4、 Use Test Fixtures Correctly: Regularly clean test fixtures to prevent oxidation, avoiding measurement errors or localized overheating damage to modules caused by poor contact.

• 5、 Regularly Calibrate and Maintain Core Equipment Components: Light source intensity (irradiance uniformity, stability), current/voltage sensor accuracy, and temperature probes are core metrology units. They must be calibrated periodically according to standards (e.g., IEC 60904 series). Also maintain optical components (clean lenses/reflectors) and mechanical movement mechanisms to ensure stable and reliable equipment status.

• 6、 Follow Standard Operating Procedures and Parameter Settings: Accurately input module parameters (e.g., nominal power, type) before testing. Carefully set pulse width and intensity to avoid irreversible thermal damage to modules from excessively long/strong pulses (especially for thin or temperature-sensitive materials). Allow modules to cool sufficiently after testing before proceeding to the next test or removal. When encountering abnormal data, investigate environmental factors, contact issues, and equipment status; never arbitrarily alter or ignore abnormal results.