Typically, generators with 20 kW of capacity are considered whole-home generators and cost more. If a generator has less than 10 kW of power, it's meant for smaller jobs and will cost less.
Unlike older gas-only generators, ones that run on propane offer a higher degree of versatility because they can be connected to handy 20-pound tanks or larger whole-house propane tanks.
Like gasoline-only generators, dual-fuel models convert fuel ... On propane, it can run up to 7 hours on a 20-pound tank when drawing a 50 percent load. This model has a 120/240V-50A outlet ...