BUY New & Used Commercial Backup Generators 25kW-99kW GENERATORS FOR SALE

Industries That Use 25 kW to 99 kW Generators

Two buyers share this band: contractors and rental houses moving trailers between jobs, and building owners putting a set on a pad to carry a defined group of circuits.

• Construction: Trailer units power welders, compressors, pumps, and site trailers. Several trades drawing at once push crews into the 50 to 70 kW class.
• Rental fleets: The 62 kW towable is a fleet staple, and rental cycling is why so many used units at that size carry 6,000 hours or more.
• Agriculture: Irrigation, grain handling, and barn ventilation, sometimes as prime power far from a service drop.
• Water districts: Lift stations and booster pumps are nearly all motor load, so they land in the upper half of the band.
• Cities and municipalities: Pump houses and small operations buildings, where procurement rules often call for new equipment.
• Schools: Smaller buildings and community centers that double as shelters.
• Telecom: Shelters and cell sites, where printed runtime matters most.
• Small manufacturing: Machine shops and single production lines running whole shifts.

Sizing notes by sector are on our industries served pages.

25 kW to 99 kW Generators at a Glance

• Apparent power: 31 to 124 kVA at 0.8 power factor.
• Current, three-phase: 37.8 A at 25 kW to 120 A at 80 kW on 480V, and 87 A to 278 A on 208V, per our amperage chart.
• Diesel burn at full load: 2.9 gal/hr at 30 kW to 6.1 gal/hr at 75 kW on our chart.
• Towable weight above 50 kW: 3,770 lb operating for a Magnum MMG55FHDCAN6 to 7,239 lb with fuel for a JCB G70RS.
• Most common format: trailer-mounted diesel. 63 of the 64 units we’ve listed here ran on diesel, and 62 kW was the most common output.
• Where it splits: below 50 kW nearly everything is a towable; above it, stationary standby sets with a transfer switch become a real share of the market.

Where Each Sub-Range Fits From 20 kW to 99 kW

Most buyers settle into one band once the load list is done:

Single Sizes From 35 kW to 80 kW, Side by Side

Each size links to its own page. Amps are three-phase from our amperage chart, except 35 and 45 kW, which come from Generac’s SD035 and SG045 sheets.

Neighboring sizes are close, so the largest motor start usually decides it, not the running total.

What Has Come Through Our Yard From 30 kW to 96 kW

Units we’ve listed in this range, by the kW we listed:

Hours split by format. The Multiquip DCA70 towables come out of rental fleets with 6,000 to nearly 16,000 hours, while the low-hour used units are mostly stationary sets: the DCA56SPXU2 at 379 hours, the Cummins DSFAE at 749, and the Caterpillar D60P3 at 1,564.

Five Spec Sheets From the 50 kW to 80 kW Classes

Published figures for towable and stationary models across the upper part of the band:

The towables are sold on prime ratings and carry their runtime with them. The stationary sets are sold on standby and let you pick the tank: the SD080 runs from a 13-hour to a 93-hour supply on the same generator. And the MMG55FHDCAN6’s 50 kW figure only holds at 600V, a pattern covered below.

Diesel Burn From 30 kW to 75 kW, and How Long a Tank Lasts

Our diesel fuel consumption chart has four rows inside this band. The last column is the full-load figure times 24:

Maker sheets track the chart closely at this size. Caterpillar’s DE65 GC burns 4.8 gal/hr at full load at its 60 ekW standby rating, matching the 60 kW row, and Cummins lists 5.0 gph for the C60D6R at full standby. Caterpillar’s D80 GC shows the same 6.1 gal/hr as the 75 kW row, and Generac lists 6.3 gal/hr for the SD080.

When comparing runtime, check the load behind it. Doosan prints 25 hours at 100% load for the G70WDO’s 110-gallon tank, Generac prints 32 hours at 75% of prime for the MDG100DF4, and Atlas Copco prints 35.3 hours at 75% load for the QAS 95 using 90% of its 166 gallons. Compare them at the same load step.

Three-Phase Amps From 25 kW to 80 kW

Every row inside the band on our generator amperage chart, three-phase at 0.8 power factor:

The 240V column is three-phase. At the top of the band, an 80 kW set on 208V puts 278 A through its breaker against 120 A on 480V, so a 208V building ends up with heavier cable and a larger transfer switch for the same generator. Our power calculators will check your total.

What Changes Once You Cross 50 kW?

Three things: three-phase becomes the norm, ratings start depending on voltage, and towables get heavier and add emissions hardware.

• Phase: Single-phase is common through the 25 to 49 kW band. From 50 kW up, three-phase is standard, though some 65 kW models can still be configured single-phase, so confirm phase on the exact unit.
• Voltage-dependent ratings: The MMG55FHDCAN6 is 50 kW standby at 600V, 43 kW at 480V, and 37 kW at 208V.
• DEF: Tier 4 Final towables here use SCR aftertreatment. The Doosan G70 carries a 5.1-gallon DEF tank and the MDG100DF4 9.1 gallons usable.
• Weight: Towables run 3,770 to 7,239 lb operating, from the MMG55FHDCAN6 to the JCB G70RS. Those on our 25kW – 49kW page top out around 4,030 lb wet.

Jobsite Trailer or Small-Facility Standby Set?

Buy a trailer if the unit moves more than a few times a year; buy a pad-mounted standby set if it serves one building.

A trailer package brings its own fuel, running gear, and enclosure; Generac’s MDG100DF4 has hydraulic surge brakes and a 3-inch pintle ring standard, with tandem axles optional. Site conditions count too: Atlas Copco’s QAS 95 holds full output to 40°C at sea level but drops to 90% from 30°C to 40°C at 2,000 m, so a hot or high site may need the next size up.

A standby set trades mobility for options. Cummins builds the C70 N6 open or in weather-protective, Sound Level 1, Sound Level 2, or winter enclosures, with average wet weight rising from 2,449 lb open to 2,754 lb in the Level 2 housing. Towables are listed under trailer-mounted generators, and pad-mounted units under industrial standby generators.

Is Natural Gas Practical Between 50 kW and 99 kW?

Yes, for stationary standby where gas service is already on site, as long as the meter and piping can deliver the flow.

Gas demand climbs steeply across the band. Cummins lists 806.3 cfh at full load for the C50N6, Kohler 975 cfh for the KG60, Generac 928 scfh for the SG070, and Kohler 1,202 cfh for the KG80. Supply pressure varies by model too, from 5 to 11 inches of water column on the KG60 to 11 to 14 inches standard on Generac’s SG080. Have the utility confirm both before the pad is poured. Gas units are under industrial natural gas generators and diesel under industrial diesel generators.

Prime Ratings, Ex-Rental Hours, and the New-or-Used Call

If the set will run for whole shifts or as primary power, size it on its prime rating, not standby.

Cummins rates the C60D6R at 60 kW standby and 55 kW prime; prime covers varying load for unlimited hours. Generac lists 72 kW prime figures for the SD080 and SG080 but notes they can’t be sold as EPA-certified prime in the US, which matters for a permitted install.

Read used hours by format: an ex-rental 62 kW towable at 10,000 hours and a stationary 80 kW set at 749 hours are different purchases. New is the answer when a spec calls for a factory warranty, a current emissions tier, or new equipment outright, as municipal and school work often does. Browse used industrial generators and new industrial generators side by side.

Should You Buy or Rent Between 25 kW and 99 kW?

Rent for one project with an end date; buy for standby or year-round job use.

Purchase prices here are modest, so steady rental catches up with the cost of an inspected used unit within about a year. Our rental side, Stag Power Rentals, handles short-term work, and our generator financing options help when timing is the obstacle.

Below 25 kW or Above 99 kW?

Under 25 kW and no meaningful motor load? Drop down. Past 99 kW, or with equipment coming soon, step up.

You can also browse every output we carry on shop by kW.

Inspected, Load Tested, and Backed After the Sale

Every unit in this range goes through a 22-point inspection and load bank testing before it ships. We’ve been buying and selling industrial generators for over a decade. Every purchase carries our 30-day IronClad warranty, and our service and maintenance team handles industrial generator repair and scheduled service afterward.

Ready to Buy a 25kW – 99kW Generator?

Tell us whether the unit moves or stays, the voltage and phase, and your biggest motor, and we’ll point you to the right sub-range. Look through our used industrial generators and new industrial generators, or contact us and we’ll run the load calculation with you.