PV Module Electroluminescence

Advanced diagnosis technique

photovoltaic electroluminescence

KRK Energy Service is always on the lookout for new technologies that can offer reliable and thorough services to all clients. After long training and many lab tests, we have introduced a new type of inspection for PV modules. This can examine accurately the conditions of each PV module made of mono or polycrystalline.

Electroluminescence Testing

Elettroluminescenza pannello fotovoltaico

This inspection can detect exactly how electrons work (or do not work) inside a photovoltaic cell. This enables us to evaluate with exact precision the real conditions of a PV module. For years, this type of analysis has been the prerogative of modules’ producers. Here at KRK Energy Service, we have organised a lab space where we can analyse the images produced by radiations coming from the cells when electricity runs through them. The results obtained are an exact “scan” of the PV module. The skills acquired during training with reputable PV modules producers and the experience matured through our work mean that we can diagnose with precision any faults or failures on all types of module

How we do it

pv electroluminescence detail

The electroluminescence test is usually carried out after other preliminary tests. This procedure speeds up analysis operations and therefore decreases costs. The procedure includes 4 important steps, each of which examines a different characteristic of the photovoltaic system.

  • - Monitoring System Analysis;;

    This step is important because it allows us to focus our tests on a particular area of potential malfunction. This in turns reduces costs and timeframes of service.

  • - I-V Curves Analysis;

    This test provides data on the real energy output of a string in proportion to its irradiation. This test can: detect abnormal loss of output (different from what declared by producer); detect any issues due to potential induced degradation (PID), which can cause losses up to 50%.

  • - PV panel thermography;

    Certain defects on PV modules mean that internal resistance can lead to cell overheating. These defects can be spotted by a thermal imaging camera.

  • - Electroluminescence;

    The last step is an analysis of electroluminescence on all modules that have shown any kind of issue during the previous tests. The result of this test will determine whether the module needs replacing (and find the causing problem) or it can be kept operational.

In some cases of adverse weather conditions or very complex photovoltaic systems, it may not be possible to perform an analysis of the I-V curve and thermography. In these cases it is advisable to collect a sample of modules and analyse it in the lab. The tests are carried out in controlled weather conditions, rather then on the field.


Are you intersting to test your PV system on some pv module? We're available to make an inspection at your plant. Our techician are available for every explanation.