Specification : Cell: Poly-crystalline Maximum: 260 Wp Open-circuit voltage (Voc): 38 V Optimum operating voltage (Vmp): 31.2V Short-circuit current (Isc): 8.65A Optimum operating current: 8.02A Module efficiency: 16.50% Solar cell efficiency: 17.25% Number of cells: 60 pieces (6 x 10) Size of cell: 156 x 156mm (mono) Size of module: 1,640 x 990 x 40mm Maximum system voltage: 1000V Temperature coefficient of Isc: 0.1%/°C Temperature coefficient of Voc: -0.38%/°C Temperature coefficient of Pm: -0.47%/°C Temperature coefficient of Im: 0.1%/°C Temperature coefficient of Vm: -0.38%/°C Temperature range: -40 to 85°C Surface maximum loading capacity: 60m/s (200kg/m2) Allowable hail load: steel ball fall down from 1m height Weight per piece: 16kg Junction box type: PV-RH701 (TUV) Connectors and cables type: with TUV certificate Length of cables: 900mm Output tolerance: ±5% Frame material: aluminum Warranty: 2 years product warranty and 25 years 80% of power FF: ≥72% Loading quantity: 20ft container: 270 pieces 40ft HQ container: 800 pieces Main Export Markets: Asia Australasia Central/South America Mid East Africa North America Western Europe Package: carton, wooden case or as your spec. solar panels for house supplier website:http://www.4g5gcameras.com/solar-panel/