We are supported by our readers. We may earn a small commission for purchases made through links on our site at NO additional cost to you.

Generac 5939 GP5500 Review | Expectations

Generac 5939 GP5500 Gas Powered Portable Generator

One of Generac’s flagship models, the Generac 5939, it’s a high quality, reliable and durable edition. It can be used to provide power at home in the event of an outage. As well as portable power for RV, camping, or construction site. The Generac 5939 portable generator review will discuss the key features and drawbacks for a clear view of this model.

Since its establishment in 1956, Generac has been the go-to brand for affordable generators for home backup, and outdoor power needs. They have grown to become one of the largest suppliers of power products for residential, and commercial use. With its headquarters in Waukesha, Wisconsin, Generac has invested in the best technologies in developing its generators. They have service centers and dealerships in various parts of the country, and beyond. This has made it easy for their customers to access professional repair services.

Key Features

Generac 5939 Review
  • Generac 5939 GP5500, provides 5500W of continuous power, and 6875W of starting power. This is enough for household power emergencies, recreational power supply, and construction site usage.
  • Has an OHV engine that features splash lubrication, ensuring long generator life.
  • Run-time of this generator is over 10 hours on 50% of its maximum rated load.
  • Runs on Gas, and has a large fuel tank with a capacity of 6.7 gallons.
  • Equipped with a fuel gauge for effective monitoring of the fuel level remaining in the tank.
  • The engine is secured by a hardened steel structure for added strength, and durability.
  • The motor is also supported at various points by motor mounts. This keeps the generator vibrations to a minimum for smooth, and quiet operation.
  • Uses a low-tone muffler to lessen the noise it produces in operation, thus, won’t disturb your neighbors when you use it on a camping site.
  • Weighs 180 pounds, and has rugged non-flat wheels and an adjustable handle, for easy movement and portability.
  • Its low oil shutdown feature puts the engine off when the oil level gets too low. This prevents engine damage as a result of running with too little oil.
  • Armed with an hour meter for maintenance reminders and a power panel on the side makes it easy to tap power from the generator, as well as operating it.
  • Has four 120 volts power outlets, and a twist lock 120/240 volts power outlet.
  • Equipped with an automatic voltage regulator and circuit breaker outlets to prevent generator overload.
  • Backed by a 2 year manufacturer’s warranty on all parts.
  • Instructions provided for assembly of the wheels and other parts are easy to follow and comprehend.
  • The Generac 5939, works well in harsh weather conditions.
  • It’s one of the most cost-effective generators around.
Generac 5939 generator ports


Wattage: 6875 watts starting – 5500 watts running

Fuel type: Gasoline

Fuel tank capacity: 6.7 gallon

Weight: 180 pounds

Dimensions: 29 x 27 x 25 inches

Certificates: EPA approved

Starting method: Manual recoil start

Engine: OHV engine, 3600 RPM

Engine displacement: 389 cc.

Material: Metal, open steel frame enclosure

Outlets: (4) 120V 20A – (1) 120/240V 30A

Warranty: 2 years limited warranty

Generac 5939: Downside

  • The Generac 5939 takes some time to start-up when you engage the recoil while lacking an electric start. This can get frustrating at times.
  • The generator breaks down with some users after less than one year in use. You may, therefore, end up spending a lot of time seeking repairs. Check Generac’s frequently asked questions here.
  • The packing and customer service from Generac could definitely use improvement, as a fair amount of their generators come broken from packing and then shipping.
  • Their customer service does not stand behind their product, and also finding a service center can be very difficult. If you’re handy or are willing to pay out-of-pocket for repairs, then these things shouldn’t be too much of a hassle.
  • Not CARB compliant, therefore, it’s not accessible to the residents of California.

Generac GP Generator Series

The GP series of Generac is huge, comes in different sizes for different uses. Each model also has a CARB approved and “non” CARB approved edition.

  • GP1800, with 2050 starting watts and 1800 continuous watts.
  • GP3250, with 3750 starting watts and 3250 continuous watts.
  • GP5500, with 6875 starting watts and 5500 continuous watts.
  • GP6500, with 8125 starting watts and 6500 continuous watts.

Check our review of the Generac GP2500i.

Generac 5939 Review – Conclusion

The Generac 5939 gas powered portable generator, also known as GP5500, is a powerful generator that can be used in various instances to provide stable and reliable power. Due to its power, you can power almost anything at your remote job site, farm, and most of the appliances in your home should you experience a power outage. However, their customer service is not what you would expect from a firm its size. Their customer representatives take a while to respond to queries, and this can get frustrating at times.

To sum it up, the Generac 5939 portable generator review was clear to show the pros and cons of this model. It is a good generator that holds a lot of power ideal for home standby power, and construction site power needs. It offers a good price tag, and as long as you use it wisely, it can live with you for a long time. Looking for more? Then you can check our list of top rated generators.

Generac 5939 Portable Generator Review
  • 7.5/10
    PERFORMANCE - 7.5/10
  • 8/10
  • 7/10
    DURABILITY - 7/10
  • 6.5/10
    NOISE LEVEL - 6.5/10
  • 8/10
    VALUE - 8/10


Generac 5939 GP5500 Portable Generator, is cost-effective, ideal for home emergency backup, and construction site power needs.

Home » Generac 5939 GP5500 Review | Expectations