We frequently report on the in-depth quality tests that our products have to undergo on a regular basis. In addition to internal tests, external institutes also put our products through their paces. In this context, the Fraunhofer Centre for Silicon Photovoltaics CSP conducted a LeTID test on our current IBC SOLAR module types at the end of last year. And this much in advance: all modules of the IBC SOLAR own brand completed the test procedure with excellent results.
How great is the power loss of IBC SOLAR own-brand modules when exposed to continuous strong light or high temperatures? Fraunhofer CSP investigated this question in detail and examined our modules with regard to susceptibility to “Light and elevated Temperature Induced Degradation (LeTID)”. All the module types examined easily withstood the tests and showed particularly high performance stability.
What is LeTID?
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. In particular, the globally valid test specification IEC TS 63342, which we at IBC SOLAR were involved in developing at an early stage, serves as the basis for the LeTID tests. The main concern of all those involved was and is to ensure long-term quality standards in the photovoltaic sector.
How was testing carried out?
For the current test, Fraunhofer CSP randomly selected four PERC modules each from IBC SOLAR’s own brand. During 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 during a defined current flow. The minimum test time is 324 hours (approximately 2 weeks).
The tested PERC modules from IBC SOLAR withstood these extreme conditions and performed with a particularly low power loss. The modules thus exhibit very low degradation – and that over their entire service life. For our customers, this means above all: you can rely on our modules!