Maintworld Magazine 4/2023

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PHOTOVOLTAIC ENERGY flows through the cells. Drones can also be used to capture images. The only other method offering even greater detail is electroluminescence measurement (EL measurement). This method likewise involves feeding external current into the modules. Using special cameras at night, the experts then record the electromagnetic radiation at wavelengths of approximately 1,150 nm. EL measurement thus enables the experts to look inside a solar cell and identify defective bypass diodes, failed cells, micro-cracks and even performance degradation caused by light and elevated temperature induced degradation (LETID). PHOTOVOLTAIC ENERGY Photovoltaic energy, commonly known as solar energy, is a renewable and sustainable source of electricity generated by converting sunlight into electrical power using photovoltaic cells (solar panels). These cells contain semiconductor materials that absorb photons from the sun and release electrons, creating a flow of electricity. Solar energy is clean, environmentally friendly, and increasingly used to power homes, businesses, and more. It helps reduce greenhouse gas emissions and dependence on fossil fuels. Owning a PV system is becoming increasingly popular, with benefits including greater independence from the energy market, energy savings and climate protection. CONCLUSION Modern test methods such as thermography enable testing and inspection to be performed during operation or outside the system’s regular service hours. EL measurement, for example, is performed at night. In addition, modern test methods do not require modules to be dismantled. The use of drones reduces the need to set up cranes or lifting platforms. The longer a defect goes undetected, the higher the secondary costs it causes. In this case, planners and installation and maintenance companies benefit from the support provided by recognised testing, inspection, and certification (TIC) companies like TÜV SÜD. Drawing on their technical expertise and using ultramodern technical equipment, they track down safety- and efficiency-relevant defects and identify opportunities for improvement. Combining safety inspections with efficiency checks also pays off for smaller systems, particularly when they are still within the manufacturer’s or installation company’s warranty period. REFERENCES [1] PV Strategy, Federal Ministry for Economic Affairs and Climate Action: https://www.bmwk.de/Redaktion/DE/Publikationen/Energie/photovoltaik-stategie- <strong>2023</strong>.pdf?__blob=publicationFile&v=4 50 maintworld 4/<strong>2023</strong>
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Maintworld Magazine 4/2023

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