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Diesel Generators
Diesel Generators for Home, Commercial, and Marine Use
Diesel remains the standard for buyers who want long engine life, strong fuel efficiency, and fuel that doesn't degrade in storage the way gasoline does. Our diesel generator lineup spans an unusually wide range, from Cummins Onan's smaller RV and commercial mobile units, through Kubota's Lowboy II portable industrial line, Yanmar-powered Maspower systems, Wildcat's Freedom and Renegade series, and marine-specific units from MASE and Paguro, up to Cummins' agricultural and standby generators reaching 200kW.
Home and Standby Diesel Options
For home backup, Cummins' C20D6 through C200D6D lineup covers residential and light-commercial standby needs, installing permanently with a fuel tank and running on 120/240V single-phase power. Kubota's Lowboy II series, the GL7000 through GL14000, offers a more portable diesel alternative in the 7,000 to 14,000 watt range, suited to buyers who want diesel reliability without a fixed installation, with wheel kits available to make repositioning these substantial units more manageable.
Commercial, Mobile, and Agricultural Diesel
Cummins Onan's Commercial SD and QD series, ranging from 5kW mobile units up to 20kW, along with Yanmar-powered Maspower generators from 5kW to 45kW, cover job sites, mobile applications like ice cream trucks, and general commercial backup where continuous or frequent use matters more than occasional emergency operation. Wildcat's Freedom and Renegade lines, along with the Patriot Mobile Diesel Generator, extend this into heavier-duty commercial and industrial territory, with Renegade models meeting Tier 4F emissions standards for regulated job sites.
Marine Diesel Generators
For boats specifically, MASE's IS series and Paguro's lineup, including Yanmar-powered models like the Paguro 7500 and 9500, are engineered for the confined, saltwater-exposed environment of a marine engine room, with sealed cooling and quieter operation than a land-based diesel unit. These aren't interchangeable with portable or standby diesel generators built for home or job site use, since marine installation has fundamentally different ventilation, corrosion resistance, and mounting requirements.
Frequently Asked Questions
How do I know whether I need a residential standby diesel unit or a commercial mobile one?
A residential standby unit, like the Cummins C20D6, installs permanently at a fixed property and is built for occasional backup during outages. A commercial mobile unit, like the Cummins Onan Commercial SD series, is designed to be moved between job sites or locations and often run more frequently as a working power source rather than sitting idle between emergencies. If you need one generator that stays in place and takes over during outages, standby fits; if you need power that travels with your operation, mobile commercial units are the better category.
What does single-phase versus three-phase mean, and which do I need?
Single-phase power, the 120/240V output on most residential Cummins units, is standard for homes and most small commercial applications. Three-phase power, available on select Cummins Onan commercial and Wildcat Renegade models, is required for certain industrial equipment and larger commercial systems that specifically need it, so unless your equipment or facility already requires three-phase, single-phase covers the vast majority of home and small business needs.
Why are diesel generators generally more expensive upfront than gas units of similar wattage?
Diesel engines are built with heavier-duty components designed for longer service life and more efficient fuel consumption under sustained load, which adds to manufacturing cost compared to a gasoline engine of similar output. That higher upfront cost is generally offset over time for buyers who run their generator frequently or for extended periods, since diesel typically burns less fuel per kilowatt-hour and requires less frequent major engine work than a comparable gas unit under similar use.
Can I use a land-based diesel generator on a boat if I don't want to buy a dedicated marine unit?
No, land-based diesel generators, whether from Kubota, Cummins, or the Wildcat lineup, aren't built for the ventilation, corrosion resistance, or confined-space safety requirements of a marine engine room, and using one on a boat isn't a safe substitute for a proper marine diesel generator like those from MASE or Paguro. Marine units are specifically engineered with sealed cooling systems and saltwater-resistant components that standard land-based generators simply don't have.
