Early degradation is observed in m-C-Si modules of a photovoltaic system installed in a Himalayan location.

Snail trails, single cell browning and junction box failure are observed in all the PV modules.

Degradation analysis is carried out by visual inspection, thermal imaging and I–V characteristic measurements.

Peak power degradation in IEC certified modules was found to be more than expected level in some modules.

Outcome of the study will be useful in understanding climate specific field degradation mechanism.