Electroluminescence is an examination process for solar panels, in which the photovoltaic effect is reversed. The module or the string will be energized and the modules will glow in the near infrared. This light represents the difference in electrical activity of the respective cell areas. Crystal defects, inactive cell areas, intermittent contacts and microcracks can be shown.
The light effect is about a million times fainter than daylight, according to the measurements can actually be made only in complete darkness.
Together with my partners Great Eyes GmbH of Berlin, we have developed a system that investigations can now be made in low light in the field. We go out with our camera and found defective modules without demounting and shipment to the laboratory!