170W Solar Panels 1. High reliable quality 2. CE, TUV 3. 25 years warranty for 80%+ output 4. Customized spes and sizes Mechanical pareneters:Surface glass 5mmToughened glassAdhesive coating Double PVBBtottom glass 5mmToughened glassConnecting manner BacksidePieces of cells 42pc, 36pc, 24pcWorking temperature -40~85°CPhysical paremetersCoefficient of heat transfer ~6.0W/ m2kNoise reduction ~ ...