Made of multi-crystalline solar silicone cells Peak power: 270 watts (day time with fully sun shine) Open voltage circuit (voc):42.48v Max. power voltage (Vmp): 35.3V Max. power current (Imp): 7.65A Short circuit current (Isc): 8.39A Cells in series: 72pcs Nominal working temperature: -20℃ to +40℃ Dimensions: 1950x990x50mm Weight: less than 23kg Working life: more than 25 year