Investigation on Performance Decay on Photovoltaic Modules: Snail Trails and Cell Microcracks

Abstract

Over the past few decades, the snail trail phenomenon has been known as a discoloration defect on photovoltaic (PV) modules. More recently, snail trails have also been correlated with cell microcracks in PV modules. Despite a serious concern about effects of this phenomenon on PV module performances, very few publications have dealt with this subject. The main purpose of this study is to compare the performances of polycrystalline silicon PV modules affected by the snail trail phenomenon with the reference module. The comparison was performed focusing on I-V and P-V characteristics, thermography analysis, and energy production. Measurements were carried out at the SolarTech Lab of Politecnico di Milano, Italy. The obtained results show that the snail trails may affect the polycrystalline silicon PV modules performances: Compared with reference PV, the maximum power production at standard conditions is reduced by about 40%. The energy production measured over 30 days was about 25% lower than expected.

Keywords

This publication has 8 references indexed in Scilit:

Snail Trails: Root Cause Analysis and Test Procedures
Energy Procedia, 2013
Silver nanoparticles cause snail trails in photovoltaic modules
Solar Energy Materials and Solar Cells, 2013
Experimental investigation of partial shading scenarios on PV (photovoltaic) modules
Energy, 2013
Why Do PV Modules Fail?
Energy Procedia, 2012
Microscopy study of snail trail phenomenon on photovoltaic modules
RSC Advances, 2012
Early degradation of silicon PV modules and guaranty conditions
Solar Energy, 2011
An investigation on partial shading of PV modules with different connection configurations of PV cells
Energy, 2011
Assessing the Reliability and Degradation of Photovoltaic Module Performance Parameters
IEEE Transactions on Reliability, 2004

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