Solar photovoltaic modules operate in outdoor environments for a long time and must be able to repeatedly withstand various harsh climatic conditions and other changeable environmental conditions. Ensure that its electrical performance will not suffer serious decline within a long rated life (usually more than 20 years). Therefore, before finished solar modules leave the factory, sampling inspection should be carried out in accordance with regulations. Performance safety testing includes electrical performance testing, voltage withstand insulation testing, mechanical load testing, hail testing, fire protection testing, etc. Millennial Solar provides professional comprehensive testing solutions for photovoltaic module performance safety testing and module process quality inspection, and has excellent testing equipment.

Photovoltaic module electrical performance testing

Electrical performance testing is to calibrate the output power of solar cells, test their output characteristics, and determine the quality level of photovoltaic modules. The output power of solar photovoltaic modules is a direct function of module temperature and irradiance level. By measuring the values of performance parameters of solar photovoltaic modules under different irradiance and temperatures, the performance of solar photovoltaic modules can be evaluated.

● Short-circuit current: When the positive and negative poles of the photovoltaic module are short-circuited, the current at this time is the short-circuit current of the module, which changes with the change of light intensity.

● Open circuit voltage: When the positive and negative poles of the photovoltaic module are not connected to a load, the voltage between the positive and negative poles of the module is the open circuit voltage, which changes with the increase or decrease in the number of cells in series. The open circuit voltage of a module with 36 cells in series is about 21 .

● Optimal working voltage: Also called peak voltage, it refers to the working voltage when solar cells output maximum power. It changes with the increase or decrease of the number of cells in series. The optimal working voltage of a module with 36 cells in series is 17~17.5 about.

● Maximum power: also called peak power, refers to the maximum output power of photovoltaic modules under normal working or testing conditions. Power depends on solar irradiance, solar spectral distribution and the operating temperature of the module. Therefore, the test of photovoltaic modules must be carried out under standard conditions. The measurement standards are irradiance, spectrum, and test temperature of 25°C.

Current Continuity Testing System

E-mail: market@millennialsolar.cn

ME-PV-CCD Current Continuity Testing System is specially designed for the 10.11 high and low temperature cycle test clauses and 10.12 humidity and freezing test clauses in the IEC61215 standard. It mainly includes providing stable DC power, current recording, temperature recording and temperature control functions. Through temperature control of the DC power supply, it can monitor multiple currents and temperatures in real time for a long time. Used in conjunction with the Temperature and Humidity-freeze Test Chamber, it can monitor the internal circuit continuity of multiple photovoltaic modules. Determine the fatigue resistance of the material, the rationality of the lamination process, and the stability of the welding quality of the solar cell module in high and low temperature alternating environments.

Bypass Diode Thermal Tester

E-mail: market@millennialsolar.cn

The quality of bypass diodes directly affects the power generation of photovoltaic power stations. Therefore, the Bypass Diode Thermal Tester developed by Millennial Solar can effectively detect the performance of diodes. The corresponding relevant implementation standards are: IEC 61215 (MQT 18.1 Bypass Diode Thermal Test); IEC 61730 (MST 25 Bypass Diode Thermal Test). It can test and record diode forward/reverse voltage, diode temperature, solar module temperature and other parameters. Through the fast circuit converter, the forward voltage and reverse voltage can be switched within 10ms. It can quickly and record the changes in diode voltage, current and temperature during the circuit conversion process, and can control the application of reverse voltage through temperature.

The photovoltaic industry has become very mature after decades of vigorous development. The electrical performance of photovoltaic modules, as its main attribute, has always been used as the basis for evaluation and trading. Both module manufacturers and photovoltaic investors hope to obtain accurate electrical performance data. The bypass diode thermal performance testing machine, current continuity testing system, PID testing system, pulse voltage tester and other equipment developed by Millennial Solar can help users accurately measure the electrical performance parameters of photovoltaic modules and control product quality.