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Aiming at the problem of power degradation and service lifetime of photovoltaic (PV) modules, based on the inverted S-shaped normalized power degradation law of PV modules under accelerated damp-heat conditions, an exponential time scale transformation function is proposed to transform the nonlinear normalized power of PV modules. The Gamma process is applied to model the normalized power degradation data of PV modules under accelerated damp-heat conditions, and service lifetime of PV modules is estimated based on the definition of PV module lifetime. The correctness and rationality of the proposed method are verified by measured service lifetime and estimated service lifetime of PV modules under the damp-heat test. The method shows that the average service lifetime of PV modules is about 20-25 years at 50 °C and 45% relative humidity. At the same time, the existing accelerated degradation test was analyzed and improved, and the possibility of using the step-down accelerated degradation test instead of the traditional constant stress accelerated degradation test was discussed.