... .2.Solar panel: 10W-100W according to different area.(Certified by CE,IEC61215/IEC61730,ROHS SH7104324,UL,PV CIRCLE,RGR,MCS,ISO9001 ... battery 12V-48V according to different area.(Certified by EMC,ISO14001:2004,ISO9001:2008,CE)Life span : 5 years. Maintenance free. 4 ...