Induced Degradation (LETID)
TüV NORD China
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TüV NORD China
Global Third-party Expert in Testing and Certification of PV Products, Energy Storage Products and Systems
LETID, as known as Light and Elevated Temperature Induced Degradation. With the PV modules using high efficiency technology such as PERC/TOPCon/HJT dominating the market, the phenomenon of LETID has become a hot topic. Compared to the LID, LETID continues to occur for months or even years after installation and recovers more slowly, with a power degradation of even more than 10%. TüV NORD provides testing and certification services for LETID in accordance with IEC TS 63342:2022，testing the LETID sensitivity of PV modules.