The Champion Power Equipment 4500-Watt Inverter Generator is ultra-quiet and ideal for camping, tailgating, powering items around the RV or providing backup for your essentials. Operate your Dual-Fuel generator right out of the box on gasoline or propane, and easily switch fuels with the EZ Start dial. When the 2.3-gallon tank of gasoline is full, the 212cc Champion engine produces 4500 starting watts and 3500 running watts and will run for up to 14 hours at 25% load. When using a 20-pound propane tank, it produces 4500 starting watts and 3150 running watts and will run for up to 21 hours at 25% load.