Tandem solar modules made from silicon solar cells with high current density and smaller size. Solar panels are made of aluminum alloy frame, front and bottom laminated packaging is made; there is a metal frame assembly mounting holes, easy to use, solid structure. 3mm thick tempered glass front plate, to provide efficient protection to resist environmental and mechanical, on the direct and scattered light having a high transmittance. Seal base-plate can effectively prevent the intrusion of moisture and water penetration corrosion.