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Cummins Onan 2.8HGJBB-1120 Generator Review

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An Awesome RV-Ready Portable Dual Fuel Generator

Power should be dependable in your "home away from home." For more than 80 years, Cummins has been the industry standard for quiet, reliable, and creative RV power. This generator is from their RV Quiet Gasoline Series, and can be run on both Gasoline and Propane.

Quick Overview of the Cummins Onan 2.8HGJBB-1120 Generator

Features
Exhaust system from Cummins Onan engines.
Extensively concentrated mounting with vibration isolators.
Cooling using a cross flow.
The drip-control foundation is made of sheet steel.
Muffler with a cover.
Spark arrestor muffler certified by the USDA Forest Service.
Intuitive mechanical control system.
A self-choking mechanism.
Overhead Cam.
Dedicated to a single side service.
Shutdown due to low oil levels.
Fuel pump (gasoline) and solenoid (electricity) (LP).
With a built-in control panel.
Connector for the remote start that is sealed.
Powered by a battery.
Protection of the set wiring and the remote control wiring by combining DC circuits.
Breaker with a magnetic field.
A generator set with output leads of 50 inches (1.3 meters).
Ignition system with solid-state components.
Diagnostics are included as part of the base package.
Specifications
Watts: 2800
Requires less than 10% ethanol in the fuel.
22 Inches in length, 16.3 inches wide and 12.8 inches high.
The generator has a 125-pound dry weight.
At 10 feet away, the sound level drops to 70 dB(A).
Three-year guarantee.

Are Cummins Onan Generators any good?

Before we look at the Cummins Onan 2.8HGJBB-1120 Generator, let us look at the brand first.

Onan the brand

Onan generators, manufactured by Cummins Inc., are engine-driven power stations for RVs.

You can rely on an Onan RV generator to power your vehicle.

Onan generators can be powered by gasoline, diesel, or liquid propane, depending on the model. Gasoline and/or propane engines are standard equipment in most recreational vehicles. Diesel generators are used in heavy-duty vehicles such as farm machines, buses, RVs, and huge coaches.

RVs with permanent Onan generators can choose from a wide range of models, from tiny to large. Whether you require a modest QG 2800i or a big split-phase QD 12500, Onan offers a generator to suit your RV's size and needs.

Onan are RV Generator market leaders

In 1926, in response to a request from a friend, David Onan created the first Onan generator. The MicroQuiet 4000 and other devices like it have evolved over time. Many RVs come equipped with Onan RV generators, which are permanently installed. They're smaller, lighter, quieter, and easier to install than their predecessors, and they also use less gasoline.

In general, Onan power systems are lighter and more oil-capacity-capable than other systems. As a result, there are fewer issues and more time between maintenance visits. The smaller weights also allow RVers to pack more, making it easier for them to travel.

More than 85% of the RV generator industry is dominated by Onan. With their high-quality products, they deliver on their promises of powering recreational vehicles of all shapes and sizes for years to come. They deliver on their promises.

What I like about Onan generators

Onan has a reputation for being reliable. An RV with one of these generators is a good investment because, if cared for properly, it will likely outlive the RV.

Most RVers are looking for a power supply that is easy to access and doesn't get in the way. They can be started with a simple switch, are much quieter than they were in the past, and use less gasoline. A built-in generator allows it to be started from a distance and recharge batteries quickly.

Electronic ignition and Permanent Magnet Alternators (PMA), which harness the magnetic field generated by the rotor, are two of Onan's more recent features. In addition to reducing noise and vibration, this also reduces fuel consumption by slowing down the engine.

Generator issues you need to be aware of

A generator installed into an RV means that it must be serviced on site if it breaks down. It is part of the RV, whereas if you had a portable generator then you have more options when it comes to repairing it. 

Another issue with a fixed generator is it will always be in the same place and at exactly the same level of loudness. An RV's noise can be reduced by moving a portable unit away from it.

Also to put it simply, they're expensive. From $3,100 to $4,600, Onan RV power stations of 2500 to 5500 watts are available. The cost of adding a generator to an existing recreational vehicle is prohibitive, even if yours already has one.

Additionally, these generators can be a little noisy. To prevent being a nuisance to your neighbors, be considerate and observe quiet hours.

When properly maintained, these generators can be excellent, but if left unattended, they might develop difficulties.

Storage is a common issue with engines of any kind. The most typical problem is a carburetor that has been sitting for months without being used. When the intake valve is varnished, it needs to be coddled a little before it starts.

Even if it's in perfect working order, it may still require a complete overhaul. Fuel stabilizers and draining the carburetors of fuel before storage are two of the best ways to avoid this problem.

A propane-powered engine also eliminates the storage concerns because the fuel doesn't spoil.

Burning oil is another issue that we've noticed with Cummins Onan generators. As soon as the engine heats up, many of them contain a low oil shut-off mechanism that will prohibit or shut the engine down. It's crucial to monitor how much oil is being used.

Cummins Onan 2.8HGJBB-1120 Generator Review


Cummins 40KYFA6747 4000W Gas Generator

When you are camping, car camping, RVing, or Tailgating, you will need a quiet and reliable generator, and this is where Onan comes into its own. 

Who is the Cummins Onan 2.8HGJBB-1120 Generator for?

For all motorized recreational vehicle generator sets, the Cummins Onan 2800 Generator 2.8HGJBB-1120 complies with the CARB/EPA Tier 4 Final and Phase IV requirements and specifications necessary. All 50 states are covered.

The Cummins Onan 2.8HGJBB-1120 Generator runs an air conditioner with 600-watt baseload power and additional 300-watts of power available for lights, electronics, and entertainment in truck campers or pop up trailers.

How does the Cummins Onan 2.8HGJBB-1120 Generator perform?

The Cummins Onan 2.8HGJBB-1120 Generator satisfies CARB and EPA standards for gasoline-powered generator applications such as travel trailers, truck campers, and popup campers in all 50 states of the United States.

A digital voltage regulator, frequency regulation, and a single-pole 25-Amp Circuit Breakers are included in the generator set.

With a weight of 125 pounds, the Cummins 2800 Onan Generator is one of the lightest and most compact generators on the market today. Includes sealed remote start connector and 50-inch generator set output cables.

You don't have to be concerned about your safety when traveling by RV in our national parks. National Park Service sound level criteria for the RV Generator Set Quiet GasolineTM Series RV QG 2800 are met by the Cummins Onan 2.8HGJBB-1120 Generator.

A typical installation will reduce the actual sound level to less than 70 dB at 10 feet distant. As a result of the generator's vibration isolation system, the Cummins Onan 2.8HGJBB-1120 Generator runs remarkably quietly.

The USDA Forest Service-approved, fully enclosed, spark-arresting muffler further reduces noise.

On-board diagnostics and troubleshooting are provided via the microprocessor. ANSI/RVIA specifications call for voltage and frequency regulation to be within 5% and 10% of each other, respectively.

Fused DC circuits safeguard the set wiring and the remote control from harm caused by the low oil shutdown. The Cummins Onan 2.8HGJBB-1120 Generator effective and economical operation is ensured by the set's solid state ignition. Fuel and Air Filters that can be replaced.

It comes with a 3-year limited warranty that covers all parts and labor (excluding normal maintenance), as well as a free 90-day minor adjustment policy.

The Cummins Onan 2800 Generator Manual is included in the box.

The Cummins Onan 2.8HGJBB-1120 Generator is so quiet

Onan generators are known for their quiet operation and low-toned sound. Metal springs or rubber can also be used to absorb vibrations from the motor.

To further reduce noise and vibration, Onan has developed an inverter generator that utilizes updated permanent magnet alternators and operates at various speeds. Your neighbors may not even notice that your RV's generator is running because it will no longer make a shimmy sound.

Cummins Onan 2.8HGJBB-1120 Generator is fuel efficient

There is typically a need to keep an eye on your generator's fuel tanks. Motorhome generators typically shut down when the fuel tank is around a quarter full. Newer Onan models, on the other hand, use fuel more slowly, allowing you to get more power and get further between fill-ups, saving you money and stress.

Cummins Onan 2.8HGJBB-1120 Generator parts are widely available

There are a lot of these Onan generators out there, so procuring replacement parts or repairs is rather simple. Many of their products are interchangeable and have some standardization.

Cummins Onan 2.8HGJBB-1120 Generator is reliable and easy to maintain

When our Cummins Onan generators have malfunctioned in our recreational vehicles, it has virtually always been because of a fuel issue that occurred as a result of the vehicle being parked.

Our Onan, which is very old, still starts effortlessly and has only received oil changes. The engine should last a long time if it is properly maintained and stored.

The Cummins Onan 2.8HGJBB-1120 Generator is a good investment

Generators are an excellent investment if you're going to be boondocking somewhere hot and need to cool down in the middle of August. You may not want to spend a lot of money on a backup power plan if you prefer camping at full hookup campgrounds but having one increases the amount of things you can do.

Using a portable generator as a backup power source is a simple solution. When you need it, it provides you power, and when you don't, it gives you peace of mind that it is there if needed.

Cummins Onan 2.8HGJBB-1120 Generator gives you energy options

Powering a standard home has become less dependable and more expensive in some locations due to brownouts and sky-high utility bills. However, it is likely that the architecture of your recreational vehicle already includes a power solution.

Off-grid or in an emergency, the Onan RV generator can be your only source of electricity.

Camping trips are more enjoyable when you know you can take your comforts and conveniences with you no matter where you go because of the dependable and continuous energy generation that this generator provides.

Final Thoughts

As with any purchase it is vital you know what you are buying and why you are buying it. 

Specifically for generators you need to know what fuel you are going to want to mainly use, and you are going to need to know what products you are wanting to run on the generator. Once you have worked out how many watts they will use, then you can decide on what generator size you need. 

If you choose to go with Cummins Onan, then you have chosen a brand that has high brand recognition for providing excellent generators. The Cummins Onan 2.8HGJBB-1120 Generator is no exception, if it is an excellent reliable generator and I would recommend it. 

About Tom Bell

Hey, I’m Tom, the owner of Generator Reviews! I built this website to help you get the very most out of your generator and select the correct one for your personal circumstances. This site contains reviews of virtually every generator, detailed buying guides, as well as maintenance advice to help you keep yours in tip-top shape!

Disclaimer

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