The Fraunhofer Center for Silicon Photovoltaics CSP recently conducted LeTID tests on IBC SOLAR solar modules, examining their loss of power of in the event of sustained strong incidence of light or high temperatures. All of the IBC SOLAR modules selected by Fraunhofer CSP are characterized by very low degradation and IBC received a quality certificate for excellent LeTID stability.
Light and elevated Temperature Induced Degradation (LeTID) is triggered by excess charge carriers caused either by illumination or by electric current at temperatures above 50°C. In susceptible modules, this leads to a power loss of up to 10 percent, affecting PERC solar cells in particular.
At the Fraunhofer Center, this susceptibility to degradation has been intensively researched in recent years. For the current investigation, Fraunhofer CSP randomly selected four PERC modules each from IBC SOLAR’s own brand.
In the course of the test, the modules were exposed to different conditions and temperatures in a climate chamber over a longer period of time. In order to simulate the most realistic environmental conditions possible for the continuous use of PERC modules, the module temperature must be at least 75°C and the humidity must be 10 percent, while the modules are subjected to a defined current flow. The minimum test time is 324 hours (approximately 2 weeks).
IBC SOLAR’s PERC modules withstood the extreme conditions and performed with a particularly low power loss. This result proves the very low degradation that IBC SOLAR’s own brand modules exhibit over their entire lifetime.
ʺIt is always gratifying when modules perform so well in our tests, as in the case for IBC SOLAR. Compliance with global quality standards is of great importance, as is the careful testing of the various modulesʺ, says Dr. Bengt Jäckel, head of the Modules, Components and Manufacturing Group at Fraunhofer CSP.
The globally valid test specification IEC TS 63342, which IBC SOLAR was involved in developing at an early stage, serves as the basis for the test. The main concern of all those involved was and is to ensure long-term quality standards in the photovoltaic sector.
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