Abstract
This paper presents the investigation on deterioration of PV modules installed in Thailand. The modules under this study were dismantled and collected from KMUTT installation in the Buriram province. Modules were same model of modules that were installed over a thousand of solar water pumping systems and battery charging stations by Green E-san project since end of the 1980's and in earlier of 1990's. There are 35 modules, single crystalline silicon sized 47 Wp, in this study that were exposed in the field with less than 15 years. The experiments consist of visual inspection and measurement of performance at standard test condition (STC 1000 W/m2, 25 °C AM1.5) according to IEC61215:2005 standard. It is found that physical deteriorations and power output degradations. The physical deteriorations in this study can be classified delamination on middle cell, delamination on bus bar, delamination of edge cell and discoloration. For power output degradation, there is no module that was degraded less than 20% of nameplate wattage. There are only 8 of 35 modules (~23%) having power output over 50% of power rating.
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