Abstract
Measurements of failed PV modules under different operating temperature delineated the fact of output power reduction which becomes obvious only at high module temperature. Interconnect disconnection caused by cracks with module temperature dependence is one of the reason of the power reduction. Output power reduced modules under high operating temperature with disconnection of interconnect may pass the module performance warranty criteria at STC measurements. To evaluate the actual module performance correctly and fairly, not only the STC measurements for warranty criteria but also establishing the certified methods for on-site diagnosis of performance and the regulations for on-site inspections are required.
