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This study aimed to determine the value of effective moisture diffusivity, and the activation energy of red pepper in a conventional forced convective drying based on electricity (Conventional convective drying/CCD) and forced convective drying based solar energy (Convective Solar drying/CSD). The value of effective moisture diffusivity was determined using equation, which refers to Ficks 2 law. The value of the activation energy is determined by the Arrhenius equation as a model of the relationship of inverse temperature and the value of (Ln) effective moisture diffusivity. The results showed that the values of effective moisture diffusivity of CCD 70 C were higher than the effective moisture diffusivity of other drying systems. The result of regression analysis between the drying layers (X) and effective moisture diffusivity (Y) showed a polynomial pattern with R2 value : 0.85 (CCD 70° C): 0.81 (CCD 60° C); 0.88 (CCD 50° C) and 0.48 (CSD). Coefficient determination (R2) values, which were relatively high in CCD, indicated that the drying systems are more stable than CSD, which is depended on the environmental conditions. The result of the drying activation energy calculation showed that the value of CCD-s activation energy was 36.36 KJ/mol K, while the value of CSD-s activation energy was 31.28 KJ/mol K. Those results were consistent with the results of the previous studies.