250w mono solar panel on sale Manufacturing:5 years Power production 90%:10 years 80%: 25 years with TUV standard This panel is made ... in series4.Out put cables lengths(mm):9005.Construction:Front:high transmission 3.2mm tempered galss. Rear:white backsheet;Encapsulant:EVAPart ... use,the panel effciency is 90%,and 80% effciency after 20 year's useCertification:TUV,IEC,CE,CEC 250w mono solar panel on ...