Specifications for an I POWER silent gasoline generator 6500 I POWER Brand: I POWER. Net power output: 5500 watts. Maximum power output: 6500 watts. Fuel tank: 13.5 liters (gasoline). Runtime at half load: 9 hours. Runtime at full load: 5.5 hours. Voltage: 220 volts. Dimensions: 71*56*60 cm. Weight: 56 kg. Category: Generators.