Cummins 2.8HGLAA-8311
RV genset · Gasoline
Ships to your door CARB compliant
Cummins Onan QG series
Onan 4.0HGLBA-8306
4,000-watt RV genset, gasoline, 120V. The generator most coaches are built around.
Representative manufacturer image of the range. Enclosure finish, color and dimensions vary by model and configuration — see the specifications below for this unit.
4,000W Gasoline 120V · 33.3A 30A CARB compliant
Onan is the genset the RV industry standardized on, which has a practical consequence beyond brand preference: parts, filters and service documentation are available everywhere, and any competent RV shop in the country has worked on one. That is worth real money the first time something fails three states from home.
At 4,000 watts this unit will run one 13,500 BTU rooftop air conditioner plus lights, converter and small appliances. Air conditioning is almost always the deciding load in a coach, and the surge at startup - not the steady draw - is what sets the requirement.
Installation into a coach depends on the chassis: whether a generator bay already exists, how the fuel pickup is arranged, and how exhaust is routed. We can quote installation locally, or ship the unit to your shop.
Price
$4,604.64
Genset only — fitting quoted separately
The 4.0HGLBA-8306 is sold by UTS ElectricPros, an authorized Cummins dealer in Dallas–Fort Worth. Buying through an authorized dealer is what keeps the manufacturer warranty valid — equipment bought from an unauthorized reseller frequently is not covered, and owners tend to find that out at the worst possible moment.
| Part number | A073X541 |
|---|---|
| Output | 4,000 W |
| Amperage | 33.3 A |
| Voltage | 120 V · 60 Hz |
| Fuel | Gasoline |
| Breaker | 30A |
| CARB | Compliant |
Questions about the 4.0HGLBA-8306
How much is the Onan 4.0HGLBA-8306?
$4,604.64 for the genset itself. Installation into a coach is separate and depends entirely on the chassis - whether there is an existing generator bay, how the fuel pickup is arranged, and what the exhaust routing looks like.
Will the 4.0HGLBA-8306 run my RV air conditioning?
At 4,000 watts it will run one 13,500 BTU rooftop air conditioner plus lights, converter and small appliances. Rooftop air conditioners draw a large surge on startup, so the practical limit is usually the starting load rather than the running load. A soft-start module on the AC changes that math considerably and is often cheaper than moving up a generator size.
What fuel does the 4.0HGLBA-8306 use?
Gasoline. It draws from the coach gasoline tank, so there is nothing extra to fill.
Is the 4.0HGLBA-8306 CARB compliant?
Yes, this model is CARB compliant, so it can be sold and registered in California and in states that follow California emissions rules. If you travel or plan to sell the coach out of state, that matters.
Similar gasoline gensets
Cummins 4KYFA-6747
RV genset · Gasoline
Ships to your door
What it is for
Power on the coach, away from shore power
Boondocking, a campsite with no hookup, or a rally where the power pedestal is already full. Without onboard generation the air conditioning, the microwave and the converter all stop when you leave the plug behind.
Why it becomes urgent
Summer travel in Texas means the coach air conditioner is the load that decides whether the trip is comfortable.
Who buys it
Motorhome and coach owners running Onan QG and QD gensets.
Before you buy the 4.0HGLBA-8306
The questions that decide whether this is the right machine, answered properly rather than in a sentence on a product page.
- What fuel should I be running?Gasoline, propane and diesel each change runtime and storage.
- Would a permanent standby suit me better?A portable is manual and refueled by hand. Standby starts itself.
All the generator guides we have written
Every Cummins Onan RV generator, 2.5kW to 12.5kW · Or a portable you can carry off the coach
After the 4.0HGLBA-8306 is in
A generator is a fifteen-year relationship, not a transaction. What that looks like from here.
Cummins warranty, and ours
What the manufacturer covers, what the installer covers, and which one you call when something fails.