BUY Reliable New & Used Industrial Generators 400 kW GENERATORS FOR SALE

400 kW Generators Capable of Powering Healthcare, Telecom, Data Center Loads, and More

At 400 kW, a generator covers commercial structures, industrial plants and farms: motors, pumps and fans, plus backup for healthcare, telecommunications and data centers during an unexpected failure. An entire office building falls within its range.

Downtime-Sensitive Infrastructure Using 400 kW

400 kW shows up frequently in infrastructure applications where downtime isn’t just inconvenient — it’s a safety and compliance issue. Airport facilities often specify this range for backup power covering runway lighting, terminal operations, and navigation systems, where regulatory requirements demand power redundancy that goes well beyond typical commercial backup. Municipal water treatment and public infrastructure projects land in a similar range for the same reason: the cost of downtime isn’t measured just in dollars.

Strategic Evaluation Before Choosing 400 kW

At 400 kW, load profile matters as much as the total. A site that runs steadily near one level needs a different answer than one that swings between light and heavy demand, so gather demand data if the utility provides it and note seasonal peaks such as cooling or irrigation. Use our power calculator as a first pass, then bring the demand data to an engineer. The amperage chart converts the 400 kW rating into amps at the voltage you run.

Standby Versus Prime Rating on Fuel Figures at 400 kW

How the generator is rated matters as much as the fuel. Most 400 kW sets for airports, utilities, and data rooms carry a standby rating meant for outages, and some fuel figures change once a unit is rated for prime duty.

• Diesel, standby-rated: The mtu 6R0213 DS400 is a 400 kWe standby set, EPA Tier 3 certified, built on a 12.78 L Volvo TAD1353GE. mtu lists 26.9 gal/hr at 100% of the power rating and 14.5 gal/hr at 50%.
• Natural gas, standby or prime: Generac’s SG400 is rated at 400 kW standby and 360 kW prime. At full load it uses 4,620 scfh at the standby rating and 4,200 scfh at the prime rating. The gas line needs to deliver 11 to 14 in H2O, or 7 to 11 in H2O with the optional low-pressure setup, and Generac says the supply must be sized for the 100% load flow.

Our diesel fuel consumption chart lists 400 kW at 8.9 gal/hr (1/4 load), 14.9 gal/hr (1/2 load), 21.3 gal/hr (3/4 load), and 28.6 gal/hr (full load). That table covers diesel sets only. For gas units, go by the manufacturer’s scfh figures instead. The 400 kW row of our amperage chart lists 1390 amps at 208V and 602 amps at 480V. For a full load list, start with our power calculators. Choose a fuel category, natural gas or diesel, and the listing for each unit names its fuel.

Standby and Prime Labels on Towable 400 kW Sets

Towable sets in this range are usually rental-grade machines, and their spec sheets give both a standby and a prime figure. Caterpillar’s XQ425, for example, is listed at 375 kW standby and 340 kW prime, so its nameplate kVA is not the same as its kW output. It runs a Tier 4 Final Cat C13 engine.

• Fuel and run time: A 520-gallon double-wall UL142 tank. At 60 Hz, Cat prints 29 hours of running time at 75% of the prime rating and 26 hours at 75% of standby.
• DEF: A 12-gallon tank, listed at 33 hours at 75% prime.
• On the trailer: 283.7 in long, 102 in wide, and 126.1 in tall. It weighs 17,930 lb with oil and coolant and 22,130 lb with a full fuel tank. The trailer option is a tandem axle with electric brakes.
• Multiple units: The EMCP 4.4 control supports island-mode paralleling and load sharing with other EMCP 4.4 units.

For a unit you can move between sites, start with trailer-mounted generators.

Warranty Tied to Rating: A 400 kW Pricing Wrinkle

Before you compare prices, decide whether the unit will sit idle until the grid fails or carry load every day. That duty rating affects nearly everything else on the quote.

• Standby versus prime: Generac rates the SG400 at 400 kW standby and 360 kW prime. A set bought for prime duty gives less usable kW for the same nameplate.
• Warranty by rating: On that same Generac model, the limited warranty is 2 years on standby and demand-response units and 1 year on prime-rated units.
• Load limits: mtu’s DS400 standby rating has no overload capability and an average load factor of 85% or less. Caterpillar’s XQ425 prime rating has no limit on annual hours and allows 10% overload. Match the rating to how hard the unit will work.
• Emissions certification: A stationary Tier 3 set like the DS400 and a Tier 4 Final towable like the XQ425 with DEF are built for different uses and are not priced the same way.
• Age and hours: Browse new industrial generators or used industrial generators, and compare logged hours along with maintenance records.
• Site package: Enclosure, fuel tank, transfer equipment, and delivery distance round out the total.

Once you have a 400 kW unit in mind, request a quote.

Hospitals and Infrastructure Projects on 400 kW Backup

At 400 kW, a generator can back infrastructure projects, medical buildings or event power as well as plant loads, and the set is chosen around how long those loads must be held and how soon the utility is expected back.

Mid-Size Site or Infrastructure Load: Placing 400 kW

A single mid-size commercial site without infrastructure-level redundancy may be better served by our 350 kW generator. Larger campuses, heavier manufacturing loads or multi-building infrastructure should look at our 500 kW generator.

Certified Before Shipment: 400 kW Units

Ten years of supplying generators have taught us that buyers at this size want assurance. Each 400 kW unit is inspected to a set standard, and the 30-day IronClad warranty adds protection once it is delivered. The service and maintenance team handles follow-up work. Browse the full inventory or speak with us.

Advanced Commercial Generator Solutions

For smaller loads, look at 70 kW generators or 100 kW generators; 400 kW generators for sale cover the heavier end of commercial and industrial demand.