Glossary
Photovoltaic system reliability and durability

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Glossary


Photovoltaic system reliability and durability

Author : Julien DUPUIS

Publication date: April 10, 2026 | Lire en français

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6. Glossary

Water vapor transmission rate (WVTR); WVTR (Water Vapor Transmission Rate)

WVTR, typically expressed in g·m 2 · ·j –·1· , is a measure of water vapor transmission through a given material.

Light-induced degradation (LID); LID (Light-Induced Degradation)

Degradation mechanism related to changes in the metastability of cells and components in photovoltaic modules under the influence of light.

Light- and elevated-temperature-induced degradation (LeTID); LeTID (Light and elevated Temperature Induced Degradation)

A degradation mechanism that is still poorly understood, linked to the evolution of certain metastable states in silicon...

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