Comparison of Moisture Ingress in PV Modules With Different Backsheets Using Humidity Sensors

Alonso, Jonas Bodini; Gil, José F.; Ropero, F.; Sánchez-Friera, P.; Lalaguna, B.

doi:10.4229/23rdeupvsec2008-4av.3.28

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Water cooking for backsheet and PV module endurance evaluation

Chang

Chen

et al. 2014

2014 IEEE 40th Photovoltaic Specialist Conference (PVSC)

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Water cooking is applied as an efficient screening tool to evaluate various structures of PV module backsheet from three suppliers against thermal and humidity stressing. Visual appearance, adhesion, yellowing effect, water vapor transmission rate (WVTR) and FT-IR spectral are inspected. De-lamination among layers and PET hydrolysis take place after 600 to 800 hours. Comparing with extended damp heat reliability in P-mono modules with those backsheets, it has well correlation between water cooking to damp heat result. The acceleration factor is around six to eight times faster than damp heat test.

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Water cooking for backsheet and PV module endurance evaluation

Chang

Chen

et al. 2014

2014 IEEE 40th Photovoltaic Specialist Conference (PVSC)

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Degradation by acetic acid for crystalline Si photovoltaic modules

Masuda

Uchiyama

Hara

2015

Jpn. J. Appl. Phys.

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Degradation of encapsulants for photovoltaic modules made of ethylene vinyl acetate studied by positron annihilation lifetime spectroscopy

Hagihara

Kunioka

Suda

et al. 2016

Jpn. J. Appl. Phys.

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The structure of ethylene vinyl acetate (EVA) encapsulants of crystalline-Si photovoltaic modules after the damp heat (DH) test was evaluated by positron annihilation lifetime spectroscopy (PALS). A reduction in free-volume hole size, which indicates the progress of deacetylation, was observed after the DH test. The difference in lifetime (Δτ) between the initial and DH-tested samples clearly increased after the DH test for 3000 h. The increase in Δτ was correlated with the acetic acid concentration in the EVA estimated by ion chromatography. The depth profile analysis by slow positron beam PALS revealed that Δτ in the near-surface region of the Si-cell side was significantly larger than that of the cover-glass side. This result indicates that deacetylation near the Si cell/EVA interface is accelerated.

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Comparison of Moisture Ingress in PV Modules With Different Backsheets Using Humidity Sensors

Cited by 3 publications

References 1 publication

Water cooking for backsheet and PV module endurance evaluation

Water cooking for backsheet and PV module endurance evaluation

Degradation by acetic acid for crystalline Si photovoltaic modules

Degradation of encapsulants for photovoltaic modules made of ethylene vinyl acetate studied by positron annihilation lifetime spectroscopy

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