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Using UV LEDs for PV Module Aging and Degradation Study
S. Mitterhofer, M. Jankovec, M. Topic
Degradation, LED, UV Light
Photovoltaic Modules and BoS Components
Subtopic: PV Module Design, Manufacture, Performance and Reliability
Event: 35th European Photovoltaic Solar Energy Conference and Exhibition
Session: 5CV.3.24
1323 - 1327
ISBN: 3-936338-50-7
Paper DOI: 10.4229/35thEUPVSEC20182018-5CV.3.24
0,00 EUR
Document(s): paper, poster


Two experimental setups using ultraviolet (UV) light-emitting diodes (LEDs) for the purpose of accelerated photovoltaic (PV) module and material aging are built. The first setup consists of 8 small chambers, each equipped with one UV LED. Radiance, operation mode (pulsed or constant), duty cycle and frequency can be controlled. It is used to degrade glass-EVA-glass samples at room temperature (T). After more than 6500 hours, a loss of UV absorptance and to a lesser extent a reduced transmittance in the low-wavelength visible spectrum can be observed. The second setup is to be used inside a climatic chamber and consists of an aluminum plate, able to hold an array with up to 20 LEDs. The LEDs are water cooled and sealed with UV-transparent glass to protect them from high humidity. The radiance of the LEDs is individually adjusted to reach a homogeneous irradiance distribution at the target area. The plate can be used as a building block for larger arrays.