The Generac GP5500 5939 is part of the Generator test program at Consumer Reports. In our lab tests, Generator models like the GP5500 5939 are rated on multiple criteria, such as those listed below.
Power delivery: How much wattage models delivered and how well they handled surges in power demand over various loads.
Power quality: A generator's ability to deliver power smoothly, with consistent voltage.
Noise: Measured at 23 and 50 feet from the generator. We recommend hearing protection for standing close by the unit while it's running.
Unbiased: Retailers cannot influence placement.
Ad-free: As an integrated part of Consumer Reports, you shop in a completely ad-free environment.
New products only: You will never find used or refurbished products for sale.
Consumer Reports is an independent, non-profit organization dedicated to helping consumers. We do not accept advertising.