SOLARWATT modules have passed the tests for the Light and elevated Temperature Induced Degradation Benchmark (LeTID) with strong results. LeTID is a form of light and temperature induced power degradation of up to ten percent, which occurs in PERC solar cells. None of the cells now tested in the SOLARWATT Vision 60M and Vision 60M style modules showed a drop in performance of more than 1.8 percent.
For some time now, there has been a lively discussion in the solar industry about the impact of the phenomenon on the widely adopted PERC cells. Therefore, the industry has extended the standard for testing solar panels with an additional test for LeTID (IEC CD 61215-1: Ed.2.0). SOLARWATT is one of the first manufacturers to have its photovoltaic modules subjected to this test and can show excellent results.
Although LeTID is reversible - after some time the drop in performance is noticeably reduced again - Norbert Betzl, Director Product Management Solar Modules at SOLARWATT, considers the test important: "The predicted efficiency should be maintained in practice. It is essential for us to rule out a deterioration due to the LeTID effect as far as possible".