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SOLARWATT photovoltaic panels stand out on LeTID benchmark

  • LeTID is a form of power degradation which occurs in PERC solar cells
  • None of the tested cells in the SOLARWATT Vision 60M or Vision 60M style panels dropped more than 1.8 percent in performance
  • LeTID tests are performed in at least 2 cycles of 162 hours each

Dresden, May 26th, 2020 – SOLARWATT,  one of the leading German manufacturers of photovoltaic systems, has completed tests for the Light and elevated Temperature Induced Degradation Benchmark (LeTID) with strong results. The performance of SOLARWATT panels never reduced below 1.81 percent, standing in direct contrast to the other panels tested. The LeTID benchmark tests PERC solar cells inside solar panels for their degradation after exposure to light and raised temperatures.

The discussion in the solar industry on the impact of the LeTID phenomenon on the widely adopted PERC cells is ongoing. Under certain circumstances the typical structure of PERC cells causes them to degrade at an accelerated rate, therefore the industry has extended the standard for testing solar panels with an additional test for LeTID, the IEC CD 61215-1: Ed.2.0. SOLARWATT is one of the first manufacturers to have its photovoltaic panels subjected to this test and can show excellent results.

LeTID can occur anytime within months or even years after installation and in some cases reduces panel performance up to ten percent. However, LeTID is reversible, and after some time the performance returns almost to normal. "Nevertheless, we strive for the best possible assurance of the performance of our solar modules, 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", states Norbert Betzl, Director of Product Management Solar Panels at SOLARWATT.

Years ago, SOLARWATT was one of the first manufacturers to test its solar panels for their resistance to the adverse effects of the PID effect – with positive results. The Dresden-based manufacturer also wants to offer its partners and customers as much security against potential product issues, including LeTID.

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