PV modules laboratory testing

Wide range of independent in-house laboratory testing services done by our specialized and
experienced team, providing quick and reliable analysis of your solar panels

  • Precertification
  • Generating and verifying flash reports
  • Solar cells and panels defects detection
    • Broken cells and micro-cracks
    • Busbars contacts issues
    • Interrupted or missing fingers
    • No homogeneity
    • Short-circuit

Power (I-V measurement)

The I-V curve shows the relationship between the current (I) and voltage (V) for solar cells or panels, providing a more detailed description of its electrical properties as conversion efficiency and capabilities.

Measurement is done by our flasher (Berger PSS8), applying a series of voltages to the device.
At each voltage, the current flowing through it is measured, creating a chart of the relationship between them (I-V).

The standard test conditions (STC) for measurement are 1000 W/m², 25° temperature, and an air mass of 1.5 (AM1.5). Nevertheless, tests can also be performed in a range of temperatures (25° to 50°) and irradiance levels (700 W/m² to 1100 W/m²).

Electroluminescence (EL)

Electroluminescence (EL) imaging reveals possible solar cell defects such as micro cracks, shunts, busbars contact issues, and more. This type of testing is becoming more and more popular, with most solar panels producers doing as much as 3 different EL tests for each module during production.

The test is done by feeding current from the EL equipment (MAS 2016) to the solar panel, the radiative recombination of carriers causes light emission, as an indirect bandgap semiconductor, most of the recombination in silicon occurs via defects or auger recombination.
Although a comparatively low percentage of the band to band recombination produces the radiative emission, there is still a small quantity of radiative recombination occurring in the silicon and can be detected using an external sensor.

EL testing is a non-destructive and fast measurement way to collect data that is not always visual on the uniformity of solar cells and panels.

Potential induced degradation (PID)

Potential Induced Degradation (PID) is a phenomenon occurring with time in some crystalline silicon solar cells due to voltage stress, humidity, and heat and can cause power output loss of up to 30% along with open-circuit voltage and shunt resistance reduction.

Both EL and I-V measurement is done to the panel under specified terms to gather all necessary values and determine if the panel is suffered from PID.

The test is non-destructive, and although many manufactures now offer PID-Free solar panel’s such a phenomenon still occurs in the field.

Please contact our sales team for further information.