BUY New & Used Industrial Generators 55 kW GENERATORS FOR SALE

55 kW Generators Capable of Powering Multiple Equipment Loads at Once

A 55 kW generator is built for operations where several demanding loads run at once rather than a single piece of equipment. It comfortably handles large motors, pumps, and compressors common in industrial and commercial settings, while still having enough capacity left over to run smaller jobsite essentials — lighting, computers, and air conditioning — off the same unit.

Why Mixed-Load Operations Choose 55 kW

Not every power need fits neatly into “heavy industrial” or “light commercial.” A lot of real-world jobs land in between — a facility running both a large compressor and office equipment, or a jobsite mixing power tools with trailer-based amenities. 55 kW is sized for exactly that kind of blended load, giving enough headroom to run a major piece of equipment alongside smaller draws without constantly monitoring capacity.

Adding Running and Starting Loads Against 55 kW

Fifty-five kilowatts sits between two common sizes, so test the load against both neighbors. Total what runs together, add the biggest motor’s starting surge, and see whether the result lands closer to 50 or 60 kW. Our power calculator shows how much margin you actually have. Our amperage chart has no 55 kW row. Its 50 kW row (3 phase, 80% power factor) lists 173 A at 208V and 76 A at 480V, and its 60 kW row lists 208 A at 208V and 91 A at 480V. Expect a 55 kW set to land between them. For comparison, Kohler’s 50REOZJB spec sheet lists 83 A at 480V at its standby rating.

Emissions Certification and Fuel Burn at 55 kW

At this size, look at the fuel and the engine’s emissions certification together, since the certification can change the published fuel burn. Diesel. Our diesel fuel consumption chart skips 55 kW. It lists 40 kW at 1.6, 2.3, 3.2, and 4.0 gal/hr and 60 kW at 1.8, 2.9, 3.8, and 4.8 gal/hr, at 1/4, 1/2, 3/4, and full load. Engine version matters even inside one model: Kohler’s 50REOZK shows 4.6 gph at full standby load with its 49-state KDI 3404TM engine and 4.0 gph with the CARB/SCAQMD KDI 3404TCR engine. The same sheet approves renewable diesel (HVO/RD) and notes volumetric consumption up to 4% higher on it than on #2 ULSD. Natural gas. Generac’s SG050 is EPA certified for stationary emergency use. At 25, 50, 75, and 100% of its 50 kW standby rating it uses 308, 527, 712, and 879 cubic feet per hour, and it needs an operating fuel pressure of 8 to 14 inches of water column. Gas units are outside the scope of the diesel chart. Each listing in industrial diesel generators and industrial natural gas generators states the fuel up front.

Airman SDG65S-8E1 and Mobile Sets Around 55 kW

The Airman SDG65S-8E1 is a mobile set built around an Isuzu 4JJ1X engine certified to EPA Tier 4 Final. Its ratings are 55.4 kW standby and 51 kW prime (69.3 and 65 kVA). Its 111-gallon integral tank carries a printed 28.5 hours at full load. The unit weighs 3,307 lb dry and 4,189 lb ready to operate, the trailer itself is listed at 1,074 lb, and the GVWR is 5,414 lb. On its trailer it measures 160 x 74 x 84.25 inches. Airman lists a dual-axle trailer with surge or electric brakes and a choice of 2-inch ball, 2-5/16-inch ball, or 3-inch pintle hitch. Fuel, oil, and coolant sit inside 110% containment. Towable stock is collected in trailer-mounted generators.

California or 49-State Engine: A Cost Fork at 55 kW

Where a 55 kW price lands depends on the details below.

• Tier and intended use: Kohler’s 50REOZK is Tier 3 EPA-certified for stationary emergency applications, while the Airman SDG65S-8E1 is a Tier 4 Final mobile unit. Ask how a unit is certified and confirm that fits how you plan to run it.
• California or 49-state engine: Kohler builds the 50REOZK with a KDI 3404TM engine for 49-state use and a KDI 3404TCR engine for CARB-compliant, SCAQMD pre-certified sites.
• Rating basis: the 50REOZK ranges from 44 to 52 kW standby and 40 to 47 kW prime depending on alternator and voltage. With the 4P7BX alternator at 277/480V it lists 51 kW standby at 76 A and 46 kW prime at 69 A. Generac notes that EPA-certified prime ratings for its SG050 are not available in the US.
• Amperage: The bracketing rows from our amperage chart appear in the sizing section above. Run your equipment list through our power calculators before choosing between a 50 kW and a 60 kW rating.
• Condition: browse new generators or used generators; on used units, ask for hours and maintenance history.
• Trailer, enclosure, and delivery: mounting, housing, and the trip to your site each add to the total.

Ask for a quote through our contact page.

A Gut Check on 55 kW Against Your Load

A quick gut check on whether 55 kW lines up with your load:

Your Situation	Better Fit
Single tool or minimal backup coverage	50 kW generator
Mixed heavy equipment plus smaller everyday loads	55 kW (this page)
Larger site with multiple simultaneous heavy loads	65 kW generator

Preventative Care After a 55 kW Sale

For the past ten years we have focused on inspected, ready-to-run generators, and the 55 kW units are no exception. Each is checked and approved by a certified technician, new or used, and backed by the 30-day IronClad warranty. Your service and maintenance team contact stays the same after installation. Tell us about your load requirements through our contact page, or start in the inventory.