Solar panel: poly 220W Product Description: Maximum power (watt): 220W Production tolerance: +3% /-3% Maximum power voltage: 35.5 V Maximum power current: 6.19 A Open circuit voltage: 42.5 V Short circuit current: 7.50 A Size of module (wide and high): 1640*990*46mm Frame: Anodized Alum. Alloy 46mm thickness Number of cells: 72pcs Size of cells(wide and high): 156*156mmpoly cell Weight per piece: 22kg Type of junction box: TUV certified junction box Certificates: CE, ROHS,ISO9000 Cable type and length: 4c TUV certified cable 1m long connector type: Multi contact connector (compatible to MC type IV) Maximum system voltage: 1000V Temperature coefficient of Isc: ¡À0.05% Temperature coefficient of Voc: -0.33% Temperature coefficient of power: -0.5% Temperature coefficient of Imp: +0.08% Temperature coefficient of Vm: -0.33% NOCT(nominal operating cell temperature): - 45to +85 Insulation: 100MOhm Voltage standoff: AC2000V, DC 3000V Wind bearing: 60m/s(200kg/sq.m) Impact resistance hail impact test 227g steel ball fall down from 1m height Encapsulated with toughened glass: Low iron tempered glass with thickness of 3.2mm,light transmittance above91% Conversion efficiency: Cell conversion efficiency15.75% Quality guarantee: 2years product warranty,10years 90% and 25years 80% of the power.