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Cummins RV Generators
Cummins RV Generators for the Road
A Cummins Onan RV generator is built specifically for onboard mounting and the space, weight, and vibration constraints of a moving vehicle, distinct from a stationary home or commercial unit even at comparable wattage. This collection covers the QG gasoline and propane series, the QD diesel RV lineup, and several CARB-compliant models for travel through California, alongside a handful of commercial mobile diesel units for buyers with broader power needs.
QG Series: Gasoline and Propane for Lighter Rigs
The QG 4000 delivers 4,000 watts on gasoline, suited to smaller travel trailers or truck campers, while the QG 7000i DF adds dual fuel capability and inverter technology for cleaner power output. Cummins Onan's propane-specific models, the 2500 Watt, 2800 Watt, 3500 Watt, and QG 4000 CARB Compliant units, offer the fuel stability propane provides, useful for RVs that sit unused between trips, along with CARB compliance for owners planning routes through California.
QD Series: Diesel RV Generators for Higher Output
For larger rigs or buyers wanting diesel's fuel efficiency, the QD 3200 through QD 12,500W cover a wide range, from 3.2kW for lighter diesel needs up to 12,500 watts for Class A motorhomes running multiple air conditioners or a residential refrigerator. Diesel RV generators in this range generally suit rigs that already run on diesel, letting the generator share fuel with the main engine rather than requiring separate gasoline or propane storage.
Commercial Mobile Units for Broader Applications
This collection also includes Cummins Onan's Commercial Mobile SD and QD diesel lines, spanning 5kW to 20kW, built for job sites and mobile commercial applications rather than RV-specific installation. These share Cummins' diesel reliability but are positioned differently than the QG and QD RV models, worth noting if you're browsing this collection for RV use specifically rather than broader mobile power needs.
Frequently Asked Questions
Do I need a CARB-compliant generator if I'm not traveling to California?
If your travel plans don't include California, a non-CARB unit works fine and may cost less for comparable output. CARB compliance is purely an emissions certification and doesn't affect performance, so choosing a compliant model still leaves you free to travel anywhere. If there's any chance your routes could take you through California, buying CARB-compliant from the start avoids needing to swap generators later.
Should I choose a QG gasoline unit or a QD diesel unit for my RV?
If your RV already runs on diesel, a QD unit lets the generator share fuel with the main engine, simplifying fuel management on the road. If your rig runs on gasoline or you prefer propane's storage stability, the QG series matches that fuel type instead. Diesel generally offers better fuel efficiency for frequent or extended use, while gasoline and propane QG units tend to have a lower upfront cost.
What size RV generator do I actually need?
This depends on your rig's electrical load, particularly air conditioning. A single RV AC unit typically needs 3,000 to 4,000 watts to start reliably, while running two units simultaneously often requires 6,000 watts or more. Checking your specific air conditioner's starting and running wattage against a generator's rated output is the most reliable way to size correctly rather than guessing based on RV size alone.
