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Cummins Onan QG 5500 5.5kW Generator 5.5HGJAD-2274+ Commercial Mobile Gas Single Phase 120 Volt Air Cooled EVAP New

Cummins Onan QG 5500 5.5kW Generator 5.5HGJAD-2274+ Commercial Mobile Gas Single Phase 120 Volt Air Cooled EVAP New

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Cummins Onan QG 5500 5.5kW Generator 5.5HGJAD-2274+ Commercial Mobile Gas Single Phase 120 Volt Air Cooled EVAP New

The Cummins Onan 5.5HGJAD is designed for tough commercial applications. This generator includes exceptionally low noise and vibration, easy installation, diagnostic capability and digital regulation which maintains voltage stability as loads change. Cummins backs this generator with a standard 2 year limited warranty.

Features
  • EVAP Control Model: Evaporative emissions controlled models are required for applications using a fuel tank separate from the vehicle propulsion engine's onboard fuel storage system
  • 4-cycle Air-Cooled, OHV, 90-degree V-twin engine
  • Meets full load capability at 120° F (50° C) ambient conditions
  • High performance motor-starting capability for heavy loads.
  • Completely enclosed with muffler, quick and easy to install.
  • EFI (electronic fuel injection)
  • Start and run without AC output - engine run only
  • Requires Cummins Onan EFI Fuel Pump Kit "541-1002" (Not Included)
What our Experts Think
  • Reliable 5.5kW commercial mobile generator designed for RVs, service vehicles, and light-duty mobile power applications
  • Built on the proven Cummins Onan QG platform (5.5HGJAD-2274+) for consistent performance and long service life
  • EFI (Electronic Fuel Injection) system delivers improved starting, smoother operation, and better fuel efficiency in varying conditions
  • EVAP-compliant design supports modern emissions requirements for mobile fuel systems using separate tanks
  • Produces stable 120V single-phase output, ideal for appliances, onboard systems, and sensitive electronics
  • Engineered for low noise and vibration operation (~69 dB at 10 ft) for more comfortable mobile and RV use
  • Integrated digital voltage regulation maintains consistent power output during load changes for equipment protection
  • Fully enclosed design with spark-arrestor muffler system, supporting safer and cleaner operation in mobile environments
  • Built-in self-diagnostics and easy service access reduce downtime and simplify maintenance in the field
  • Backed by Cummins Onan’s reputation for durability, reliability, and long-term commercial-grade performance
Q&A

Q: What is the Cummins Onan QG 5500 (5.5HGJAD-2274+ / EVAP) used for?
A: It is a 5.5kW commercial mobile gas generator designed for RV, food truck, and mobile service applications, providing reliable 120V power for onboard electrical systems.

Q: What power output does it provide?
A: It delivers 5,500 watts (5.5kW) of 120V single-phase power, strong enough to run heavy RV loads such as air conditioners and appliances.

Q: What engine technology does it use?
A: It features an EFI (Electronic Fuel Injection) system, improving starting performance, fuel efficiency, and stability under varying loads.

Q: Is it quiet and smooth during operation?
A: Yes. It is engineered with an enclosed muffler, low-vibration design, and digital voltage regulation, making it one of the quieter generators in its class.

Q: What makes it suitable for commercial mobile use?
A: It is built for tough mobile environments, offering self-diagnostics, stable voltage output, and durable air-cooled construction for reliable field operation.

Q: Does it include emissions control?
A: Yes. The EVAP model is designed with evaporative emissions control, making it compliant for regulated mobile fuel systems.

Q: Is it reliable for long-term use?
A: Yes. It is designed for continuous commercial-duty operation, with Cummins Onan engineering focused on durability, serviceability, and long life in mobile applications.

Maintenance Tips

 

  • Run regular exercise cycles to keep engine, alternator, and fuel system in proper working condition
  • Use fresh gasoline and avoid long storage to prevent fuel degradation in the EVAP system
  • Inspect EVAP system regularly for vapor leaks, cracked hoses, or loose fittings
  • Change oil & filters on schedule using Cummins-approved air-cooled engine oil
  • Clean or replace air filter to maintain airflow and efficient combustion
  • Check spark plug condition and replace if worn or fouled for reliable starting
  • Inspect fuel lines & regulator system for leaks or blockages
  • Maintain battery health with proper charging and clean, corrosion-free terminals
  • Keep cooling airflow clear by removing dust, debris, and obstructions around enclosure