... in 10 years , 80% in 25 years . a grade solar cell to produce,+5w tolera POLYCRYSTALLINE SOLAR PANEL ... .70AOpen circuit voltage: 36 VShort circuit current: 8.54 AWorking temperature: -40°C----85°C Features1.Product ... Life time:20-30 years4.Temperature co-efficiency:A=+1,46mA, B=-79mV,Rp/p=0.435 ... 1KV schottky by pass diodes included 8.Construction: a.Fromt high-transmission 32mm tempered glassb.Back:TPTc. ...