TUV Solar panel efficiency is above 17% , warranty is the power 90% in 10 years , 80% in 25 years . a grade solar cell to ... : CE, IEC, TUV 2)Power range: 2WP to 310WP per panel 3)Monocrystalline and Polycrystalline4) Packing method: carton,wooden case, pallet.5 ... years product warranty and 25 years 80% of peak power.Solar systerm solar panel 180W with CE,IEC,TUV certificate