Briggs & Stratton Tri Fuel Portable Generator 12,500 Watts Complete Package Briggs and Stratton V-Twin OHV 18 gross HP, 570cc Engine, 12,500 Starting Watts, 10,000 Running Watts 7-gallon fuel tank, 7 hours run time at half-load Runs on natural gas, propane or gasoline right out of the box! Battery (with Battery Tender), Wheel Kit and Drainzit (for easy oil changes) Included 2 year limited warranty