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RV Generators
RV Generators for Every Type of Rig
Finding the right RV generator comes down to matching output and fuel type to the size of your rig and how you actually use it. A weekend camper pulling a lightweight travel trailer has very different power needs than someone living full-time in a Class A motorhome, and the Cummins Onan lineup we carry covers that entire range, from compact 2,500 watt propane units to diesel systems rated up to 12,500 watts.
Matching Generator Size to Your RV
Smaller travel trailers and truck campers generally do well with a generator for RV use in the 2,500 to 4,000 watt range, enough to run basic appliances, lighting, and a single air conditioning unit without excess weight or bulk. Mid-size rigs running two AC units or additional appliances typically need something closer to 6,000 to 8,000 watts. Larger Class A motorhomes and full-time living setups often call for the higher end of the range, 10,000 watts or more, particularly when running multiple air conditioners, residential refrigerators, or other high-draw systems simultaneously.
Propane, Gasoline, or Diesel: Choosing a Fuel Type
The QG series covers gasoline and propane options, with CARB-compliant models available for travel into or through California, where emissions standards are stricter than in other states. Propane models like the 2500 and 3500 watt Onan units are popular for their fuel stability, propane doesn't degrade in storage the way gasoline can, which matters for a generator that might sit unused for weeks between trips. For larger rigs, the QD diesel series offers higher output and often better fuel efficiency at the top end of the range, particularly appealing for RVs that already run on diesel and can share a single fuel source.
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 will work fine and may offer a lower price point for the same output. That said, CARB compliance doesn't hurt performance in any way, it's purely an emissions certification, so choosing a compliant model still leaves you free to travel anywhere. If there's any chance your routes will take you through California, even occasionally, buying CARB-compliant from the start avoids needing to swap generators later.
Can I run my RV's air conditioning off one of these generators?
Yes, but sizing matters significantly here since air conditioners have a high startup surge before settling into steady running wattage. A single RV air conditioner typically needs a generator in the 3,000 to 4,000 watt range to start reliably, and running two units simultaneously generally requires stepping up to 6,000 watts or more. Checking your specific air conditioner's starting and running wattage against the generator's rated output is the most reliable way to avoid an underpowered setup.
How is an RV generator different from a standard portable generator?
RV generators are typically built with more compact, mountable designs suited to onboard installation, along with quieter operation for campground use where noise ordinances are common. Many also include RV-specific features like remote start capability and lower vibration for smoother onboard mounting. A standard portable generator can technically power an RV in a pinch, but it lacks the integrated mounting and campground-friendly noise levels that a purpose-built RV generator offers.
