Solar photovoltaic modules are devices that convert solar energy into electrical energy and are the core components of solar power generation systems. The performance, stability and reliability of solar photovoltaic modules directly affect the efficiency, safety and lifespan of solar power generation. Therefore, testing photovoltaic modules is an important means to ensure their quality and performance. Among them, one detection method is PID test, namely Potential Induced Degradation Test. PID means that when photovoltaic modules are affected by external voltage for a long time, problems such as power attenuation, reduced efficiency, and shortened life will occur. The purpose of PID testing is to evaluate the anti-PID performance of photovoltaic modules and predict their long-term stability under different conditions. Potential Induced Degradation (PID) Tester from Millennial Solar ensures the safe, efficient and reliable operation of power generation systems.

What is PID testing?

PID testing is a method used to detect the presence of potential induced degradation (PID) effects in photovoltaic modules. The PID effect means that when photovoltaic modules are affected by external voltage for a long time, it will lead to problems such as reduced output power, reduced efficiency, and shortened life. There are roughly two steps for PID testing:

- Under specific temperature and humidity, cover the glass surface of the module with aluminum foil, copper foil or wet cloth, and apply a certain voltage and time between the output end of the module and the surface covering.

- Apply -1000V DC to the output end of the module and the aluminum frame for 48 to 96 hours in an environment of 85% humidity and 85°C or 60°C or 85°C. 

The purpose of the PID test is to evaluate the anti-PID performance of photovoltaic modules and predict whether the photovoltaic modules will be affected by external factors (such as temperature, humidity, light, voltage, current, etc.) and cause performance degradation or damage during actual operation. PID testing requires the use of some instruments, such as high-voltage power supply, temperature control box, ammeter, voltmeter, etc., to simulate the conditions in the actual working environment. The power requirements for PID testing vary according to different test methods and component types. Generally, it is necessary to provide a constant or pulse voltage higher than the maximum operating voltage of the photovoltaic module.

Comparison chart before and after 96 hours of PID test

Potential Induced Degradation (PID) Tester

 E-mail: market@millennialsolar.cn

Introduction:

Long-term leakage current will cause changes in the state of the cell carriers and depletion layer, corrosion of the contact resistance in the circuit, and electrochemical corrosion of packaging materials.

This results in cell power attenuation, increased series resistance, reduced light transmittance, delamination and other phenomena that affect the long-term power generation and life of photovoltaic modules.

Fulfill the standard:

Meets the MQT21 clauses in the IEC61215 standard and the IEC62804 standard

Features:

•The frame end of the module is grounded, which not only simulates the actual situation, but also prevents potential dangers caused by high voltage on the frame;

•For each photovoltaic module, 4-wire test method is adopted, with 2 high-voltage wires and 2 ground wires;

•Each channel is independent of each other, and the voltage size, polarity and time of multiple channels can be set independently;

•Multiple voltages, leakage current, and insulation resistance are displayed simultaneously;

•Real-time monitoring of voltage, leakage current, and insulation resistance curves;

•All monitoring data can be exported to Excel, CSV, and other format files

•You can enter the photovoltaic module serial number, test time period, and test name to query historical data and curves

In summary, testing solar photovoltaic modules is a necessary and effective method. PID testing can predict the long-term stability of photovoltaic modules under different conditions and conduct comprehensive, in-depth and scientific testing of solar photovoltaic modules.

The Potential Induced Degradation (PID) Tester from Millennial Solar can be used as the basis for quality assurance and selection of photovoltaic modules. It complies with the requirements of relevant international standards and specifications and is of great significance to the promotion of solar power generation technology and industrial development.