Gasoline, diesel, natural gas, and propane are the four most common types of generator fuels used today. While you may have heard about bio diesel fuels, they are not widely used in generators just yet, though they may become more widely used in the future.

Costs for typical 20kW generators with ATS vary from around 4,500 dollars for a Generac generator to around 4,800 dollars for a Cummins. Most manufacturers now offer a 5 year limited warranty generally, with an optional 5 year comprehensive warranty.

Generac engines were developed specifically for generators and designed to provide approximately 3,000 hours of use, with typical usage and proper maintenance an automatic standby generator can provide in excess of 30 years of service. Example, Weekly exercise time of 11 hours per year plus four 20 hr.