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Objectives of the work are to understand the challenges related to the technical performance and reliability of crystalline silicon solar cells in hot desert climates, where heat and high UV experienced in the region pose a challenge for the optimal performance. A comprehensive analysis on performance degradation and failure modes of c-Si modules in Algeria desert climate was carried out. Several modules were tested using an IV tracer and visual inspection. The modules have been in the field for considerable time (6 to 11 years). Results revealed some defects, such as; physical material defects, decreasing in the cell shunt resistance and increase in the cell series resistance that have mainly contributed in drop of output power. The hot desert climates affect the performance and lifetime of silicon solar cells negatively. This study is important for accurate prediction of performance, degradation, fatigue failure and reliability of PV panels, especially for PV installation in particular geographic regions as hot climatic zones.