Champion 3500 Dual Fuel generator w/ inverter. Excellent condition - a little over a year old - paid $1300. I have ran it for less than 10 hours total but it is more than I need and I'd rather sell it than keep it. I fog the engine and put the battery on a maintainer over the winter and and only use ethanol-free fuel in it. The post run-in oil change has been performed too. Also, this is not the same unit that Costco is selling. This puts out more wattage.
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"This super-convenient inverter generator operates off gas or propane straight out of the box. On gasoline the inverter will produce 3500 starting watts and 3200 running watts; on propane it produces 3150 starting watts and 2880 running watts. The Safety Fuel Selector Switch ensures safe and easy operation on either fuel. The inverter comes with a battery for easy push-button electric Touch Start and includes a battery-maintenance Smart Charger to keep the battery charged when not in use. "