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Cummins Onan QG 4000i DF: modern onboard power for Class C RVs
The Cummins Onan QG 4000i DF brings current inverter and fuel-system technology to one of the most useful power classes in the RV market. Built for installed applications in Class C motorhomes and travel trailers, it delivers 4,000 watts of 120V AC power and can operate on gasoline or LP vapor.
There is enough output here for a properly sized 15,000 BTU RV air conditioner plus carefully managed supporting loads. The electronic fuel injection and variable-speed inverter design give travelers cleaner power and a generator that responds to actual demand. For people upgrading an older fixed-speed RV generator, that is a meaningful step forward.
Key benefits
- 4,000 watts of onboard power: a strong fit for Class C RV comfort systems, battery charging, and everyday appliances.
- Gasoline and propane operation: dual-fuel capability adds flexibility when traveling or camping away from hookups.
- Electronic fuel injection: EFI supports consistent starting and electronically managed fuel delivery.
- Pure sine wave inverter output: clean, regulated AC power for sensitive electronics and modern RV equipment.
- Variable-speed engine control: operating speed changes with load instead of remaining fixed at all times.
- Installed RV design: enclosed construction, integrated vibration isolation, and single-side service access support permanent installation.
- 50-state compliant: designed to meet applicable EPA and CARB requirements.
- Manufacturer backing: 3-year limited Cummins warranty with nationwide service support.
Best use cases
- Class C motorhomes
- Travel trailers and purpose-built RV generator compartments
- Off-grid trips where shore power is unavailable
- Running a properly sized 15,000 BTU RV air conditioner
- Powering battery chargers, kitchen appliances, lighting, and electronics
- Owners replacing an aging 4,000-watt onboard generator after confirming installation compatibility
Full specifications
| Manufacturer | Cummins Onan |
|---|---|
| Cummins item number | A079R893 |
| Generator model | 4HGLDA-8313A |
| Product family | Onan QG 4000i DF |
| Application | Installed RV generator |
| Rated output | 4,000 watts |
| Voltage | 120V AC |
| Frequency | 60 Hz |
| Phase | Single phase |
| Rated current | 33.3 amps |
| Fuel | Gasoline or LP vapor |
| Fuel delivery | Electronic fuel injection |
| Generator technology | Inverter with variable-speed operation |
| Starting system | Electric start |
| Engine displacement | 389 cc |
| Approximate dimensions | 30.0 × 20.3 × 14.0 in. |
| Approximate product weight | 149 lb. |
| Battery | Required; not included |
| Emissions | EPA and CARB compliant for 50-state use |
| Warranty | 3-year limited manufacturer warranty |
What is included?
- 1 × Cummins Onan QG 4000i DF installed RV generator
- Manufacturer documentation
Before ordering: Compare the RV compartment, mounting points, air inlet and outlet, exhaust routing, fuel system, AC wiring, battery cables, and remote-control connection against the current Cummins installation requirements. This generator should be installed by a qualified RV-generator technician.
Frequently asked questions
What fuels can the QG 4000i DF use?
It is a dual-fuel model designed for gasoline EVAP or LP vapor installations. The finished RV installation determines which fuel plumbing and related components are required.
Does it provide 120V or 120/240V power?
The QG 4000i DF is rated for 120V, single-phase output at 60 Hz. At full rated output, 4,000 watts equals approximately 33.3 amps at 120 volts.
Can it power a 15,000 BTU RV air conditioner?
It is designed for the power needs of Class C RVs and is commonly selected for a properly sized 15,000 BTU air conditioner. Actual performance depends on compressor starting demand, elevation, ambient temperature, soft-start equipment, and the other loads operating at the same time.
Why does inverter technology matter in an installed RV generator?
The inverter system regulates AC output for modern electronics while allowing the engine to vary speed as demand changes. This can improve the operating experience compared with a conventional generator that runs at a fixed speed.
Is it a direct replacement for every older Onan 4000?
No replacement should be assumed without checking the complete installation. The generator compartment, mounts, exhaust, cooling airflow, fuel connections, electrical output, starting circuit, and controls must all be verified.
Does the generator include a starting battery?
No. The RV must supply a correctly sized starting battery, cables, protection, and charging arrangement.
Is professional installation required?
Professional installation is strongly recommended. Fuel, exhaust, ventilation, AC wiring, and carbon-monoxide safety requirements must be followed exactly.
| Shipping | This item ships to |
 |
Fast Shipping in the USA. Items ship the same or next day We process orders 7 days a week to ensure the fastest shipping possible. All generators are shipped as fast as possible out of several US locations to ensure the fastest delivery. |
|
 |
We Put Our Customers First We have done the research for you to find the best manufacturers with the best warranties. Every unit on our site is covered by a high quality manufacturers warranty. |
|
 |
We offer the absolute lowest price we can offer |
|
 |
We insist that you love our service. If you're unhappy for any reason whatsoever, just let us know and we'll bend over backwards to make things right again. |
|
 |
Ordering from AllProGenerators.com is 100% safe and secure so you can rest easy. Your personal details are never shared, sold or rented to anyone either. |
Description
Cummins Onan QG 4000i DF: modern onboard power for Class C RVs
The Cummins Onan QG 4000i DF brings current inverter and fuel-system technology to one of the most useful power classes in the RV market. Built for installed applications in Class C motorhomes and travel trailers, it delivers 4,000 watts of 120V AC power and can operate on gasoline or LP vapor.
There is enough output here for a properly sized 15,000 BTU RV air conditioner plus carefully managed supporting loads. The electronic fuel injection and variable-speed inverter design give travelers cleaner power and a generator that responds to actual demand. For people upgrading an older fixed-speed RV generator, that is a meaningful step forward.
Key benefits
- 4,000 watts of onboard power: a strong fit for Class C RV comfort systems, battery charging, and everyday appliances.
- Gasoline and propane operation: dual-fuel capability adds flexibility when traveling or camping away from hookups.
- Electronic fuel injection: EFI supports consistent starting and electronically managed fuel delivery.
- Pure sine wave inverter output: clean, regulated AC power for sensitive electronics and modern RV equipment.
- Variable-speed engine control: operating speed changes with load instead of remaining fixed at all times.
- Installed RV design: enclosed construction, integrated vibration isolation, and single-side service access support permanent installation.
- 50-state compliant: designed to meet applicable EPA and CARB requirements.
- Manufacturer backing: 3-year limited Cummins warranty with nationwide service support.
Best use cases
- Class C motorhomes
- Travel trailers and purpose-built RV generator compartments
- Off-grid trips where shore power is unavailable
- Running a properly sized 15,000 BTU RV air conditioner
- Powering battery chargers, kitchen appliances, lighting, and electronics
- Owners replacing an aging 4,000-watt onboard generator after confirming installation compatibility
Full specifications
| Manufacturer | Cummins Onan |
|---|---|
| Cummins item number | A079R893 |
| Generator model | 4HGLDA-8313A |
| Product family | Onan QG 4000i DF |
| Application | Installed RV generator |
| Rated output | 4,000 watts |
| Voltage | 120V AC |
| Frequency | 60 Hz |
| Phase | Single phase |
| Rated current | 33.3 amps |
| Fuel | Gasoline or LP vapor |
| Fuel delivery | Electronic fuel injection |
| Generator technology | Inverter with variable-speed operation |
| Starting system | Electric start |
| Engine displacement | 389 cc |
| Approximate dimensions | 30.0 × 20.3 × 14.0 in. |
| Approximate product weight | 149 lb. |
| Battery | Required; not included |
| Emissions | EPA and CARB compliant for 50-state use |
| Warranty | 3-year limited manufacturer warranty |
What is included?
- 1 × Cummins Onan QG 4000i DF installed RV generator
- Manufacturer documentation
Before ordering: Compare the RV compartment, mounting points, air inlet and outlet, exhaust routing, fuel system, AC wiring, battery cables, and remote-control connection against the current Cummins installation requirements. This generator should be installed by a qualified RV-generator technician.
Frequently asked questions
What fuels can the QG 4000i DF use?
It is a dual-fuel model designed for gasoline EVAP or LP vapor installations. The finished RV installation determines which fuel plumbing and related components are required.
Does it provide 120V or 120/240V power?
The QG 4000i DF is rated for 120V, single-phase output at 60 Hz. At full rated output, 4,000 watts equals approximately 33.3 amps at 120 volts.
Can it power a 15,000 BTU RV air conditioner?
It is designed for the power needs of Class C RVs and is commonly selected for a properly sized 15,000 BTU air conditioner. Actual performance depends on compressor starting demand, elevation, ambient temperature, soft-start equipment, and the other loads operating at the same time.
Why does inverter technology matter in an installed RV generator?
The inverter system regulates AC output for modern electronics while allowing the engine to vary speed as demand changes. This can improve the operating experience compared with a conventional generator that runs at a fixed speed.
Is it a direct replacement for every older Onan 4000?
No replacement should be assumed without checking the complete installation. The generator compartment, mounts, exhaust, cooling airflow, fuel connections, electrical output, starting circuit, and controls must all be verified.
Does the generator include a starting battery?
No. The RV must supply a correctly sized starting battery, cables, protection, and charging arrangement.
Is professional installation required?
Professional installation is strongly recommended. Fuel, exhaust, ventilation, AC wiring, and carbon-monoxide safety requirements must be followed exactly.
Shipping
| Shipping | This item ships to |
Delivery
|
Fast Shipping in the USA. Items ship the same or next day We process orders 7 days a week to ensure the fastest shipping possible. All generators are shipped as fast as possible out of several US locations to ensure the fastest delivery. |
|
Why Buy From Us
|
We Put Our Customers First We have done the research for you to find the best manufacturers with the best warranties. Every unit on our site is covered by a high quality manufacturers warranty. |
|
|
We offer the absolute lowest price we can offer |
|
|
We insist that you love our service. If you're unhappy for any reason whatsoever, just let us know and we'll bend over backwards to make things right again. |
|
|
Ordering from AllProGenerators.com is 100% safe and secure so you can rest easy. Your personal details are never shared, sold or rented to anyone either. |
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