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.
Ease of use:
Includes starting, transport (for portables), and helpful features such as fuel shutoff.
How much wattage models delivered and how well they handled surges in power demand over various loads.
Measured at 23 and 50 feet from the generator. We recommend hearing protection for standing close by the unit while it's running.
Features & Specs - Generac GP5500 5939
Claimed output (watts) Maximum wattage for continuous operation, as per the manufacturer.
Claimed output (watts)
Fuel type Gasoline, diesel fuel, propane, or (stationary models only) natural gas.
Weight (lbs.) The generator’s weight, to the nearest pound, when fully fueled. (Propane tanks are separate, and natural-gas models are fueled externally.) Weight for stationary models, which stay where installed, is "NA," for not applicable.
Fuel shutoff Lets you draw gas from the fuel system to keep it from leaking, or from fouling parts if it degrades during storage.
Low-oil shutoff Turns off the engine if the oil level is low, preventing damage.
Electric start Lets you start the engine with a switch or pushbutton rather than a pull cord.
Fuel gauge Indicates how much fuel is in a portable generator's tank.
Bought after Sandy.Had trouble with it right from the start, the store said it was bad gas, charged me $50 for a new plug.<br />Used it then, it ran good for a couple of days then the power came back on. <br />I have tried to start it a few times since, it doesn't.<br />It has 33 hours on it.<br />Carburetor leaks gasoline.<br />Total waste of time.<br />Probably will find something else with a Briggs & Straton power plant.
How long have you owned it:
More than six months
No, I would not recommend this to a friend.
(15 of 16 customers found this review helpful)
Excellent bang for the buck
Emergency Home Power
Excellent generator, especially at this price point. With respect to complaints about noise, this unit actually has an excellent muffler .... Most of the noise is mechanical engine noise, not exhaust noise. Recommendation - after manufacturer's break-in period using traditional 30W engine oil, switch to a high-quality synthetic 10W30 (I used Amsoil ASE). The engine noise difference is amazing - subjectively about 50% less noisy using the synthetic oil!