... 80 % efficiency 3,Competitive price :0.65--0.8usd/w Poly Solar panels:1,TUV ,CE, RoHS ,ISO900.2,Warranty: 25 years ... 992*50(MM)Number of cells60PCSSize of cells(wide and high)156mm*156mm , PolycrystallineWeight per piece KG19.5KGSCertificates CE, ISO9001 ... thick),Krempel,0.17mmConversion efficiencyCell conversion efficiency above 16.04%Quality guarantee 5years product warranty,10years 90% and 20yesr 85% ...