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Maximum output power: 30W Maximum output voltage: 17.4V Maximum output current: 1.72A Open-circuit voltage: 21.6V Short-circuit current: 1.89A Cell efficiency: 16% Tolerance wattage: ±3% Standard testing conditions: AM1.5, 1,000W/m², 25°C Maximum system voltage: 715V DC Dimension: 760 x 340 x 25mm Weight: 3.5kg Resistances: 227g steel ball fall down from 1m height and 60m/s wind Frame: anodized aluminum alloy Glass: low iron high transmissive 3.2mm toughened glass Warranty: 5 years for material and workmanship 90% power output in 15 years and 80% power output in 25 yearsHigh efficiency and low price cheap solar panels china