Based on the hot and humid climate outdoor testing site（Located in Qionghai） and sub-humid climate outdoor testing site(located in Guangzhou)

the polycrystalline silicon photovoltaic modules fixed with resistive load were tested for studying performance changes in the real applications weather. The outdoor I-V tester and laboratory I-V tester were used to characterized the I-V parameters of various modules

the surface temperature of PV modules was recorded by the thermocouple in situ. The results showed that degradation of I

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Pmax of PV modules were much higher applied in the hot and humid climate compared to the modules in sub-humid climate. The surface temperature of modules deployed in hot-humid climate was also higher than those in sub-humid climate.