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Cummins Onan Generators
Cummins Onan Generators: One Brand Across Every Category
Cummins Onan covers more ground than almost any other brand we carry, spanning portable dual fuel inverter generators, RV-specific units, home standby systems, and heavy-duty commercial diesel generators reaching 100kW. A Cummins Onan generator in any of these categories shares the same engineering reputation for reliability, but the right choice depends heavily on which category actually fits your use case, portable backup, RV power, automatic home standby, or continuous commercial operation.
Portable Dual Fuel and Inverter Models
The P2500i, P4500i, and P4500iDF cover lighter portable use, with the DF models adding dual fuel flexibility between gasoline and propane. The P5000iDF and P9500DF EFI step up in output while adding remote start, letting you start the generator without going outside during a storm. The standalone 9500DF offers comparable dual fuel capacity without the inverter's cleaner power output, a reasonable option if inverter-clean power isn't a priority for your specific equipment.
RV Generators: QG and QD Series
For RV owners, the QG series covers gasoline and propane needs from 4,000 to 7,000 watts, with several models CARB-compliant for travel through California. The QD diesel series extends from 6,000 to 12,500 watts for larger rigs, particularly those already running on diesel where sharing fuel with the main engine simplifies onboard fuel management.
Home Standby: The Quiet Connect Series
Cummins' Quiet Connect standby lineup, the RS13A, RS17A, RS20AC, RS25, and RS30, installs permanently with an automatic transfer switch, starting within seconds of an outage without any manual intervention. The RS30's availability in single-phase and three-phase configurations makes it flexible for both larger residential and certain commercial electrical setups, and the Sound Level 2 Upgrade Kit is worth considering for buyers in noise-sensitive neighborhoods wanting quieter standby operation.
Commercial and Industrial Diesel
At the high end, the C20D6, C50D6, and C100D6C deliver 20kW to 100kW of standby diesel power, with the C100D6C available with or without an integrated fuel tank depending on your installation needs. The Commercial Mobile SD and QD series, spanning 5kW to 20kW in single or three-phase configurations, serve job sites and mobile applications rather than fixed installations.
Frequently Asked Questions
How do I know which Cummins Onan category actually fits my needs?
Start with your use case rather than browsing by wattage: RV owners should look at the QG or QD series specifically, buyers wanting automatic hands-off home backup should look at the Quiet Connect standby lineup, and buyers wanting portable, manually-operated backup should consider the P-series inverter generators. Commercial or continuous-duty applications generally call for the C-series diesel or Commercial Mobile units rather than the residential-focused options.
What's the difference between the standard 9500DF and the inverter P9500DF EFI?
Both deliver comparable output on dual fuel, but the P9500DF EFI adds inverter technology for cleaner, more stable power suited to sensitive electronics, along with remote start for added convenience. The standard 9500DF is a more straightforward, typically less expensive option if inverter-clean power and remote start aren't priorities for what you're running.
Should I choose single-phase or three-phase for the RS30 or commercial diesel units?
Most residential applications run on standard single-phase power, so three-phase is only necessary if your property or equipment specifically requires it, more common in commercial or certain larger industrial settings. If you're unsure which your property uses, checking with an electrician before choosing between phase configurations is worth doing, since the wrong selection won't integrate with your existing electrical setup.
