Excel Power XL6000i-DF 6kW Petrol Inverter Generator. THE EXCEL POWER XL6000I-DF 6KW DUAL-FUEL INVERTER GENERATOR. Unleash the power of choice with the XL6000i-DF's dual-fuel capability, running seamlessly on both Petrol and LPG (Liquid Petroleum Gas) - not no the fly changeover from petrol to LPG.