In photovoltaic (PV) modules, the solar cells are separated by small gaps and the stress distribution in cells is thus different from that where the cell layer is considered as a continuous one. In this paper, the solutions of the stress and displacement fields in the crystalline solar cells were developed. The stresses of the crystalline solar cells in PV module with a size of 1 580 mm × 808 mm were evaluated and the variation of the wind pressure and the effects of the storage shear modulus of the Ethylene-Vinyl Acetate (EVA) were considered. The results by the present solution were compared with those from Finite Element (FE), and the stresses of 125 mm × 125 mm and 156 mm × 156 mm cells were compared. The comparison shows that the results by present solution are in good agreement with those from the FE. The maximum stress (Von Mises stress) occurs at the middle of the cell and increases nonlinearly with an increase of the storage shear modulus of EVA. The results also show that the stress rises when the larger cells are applied.