BUY Reliable New & Used Commercial Generators 300 kW GENERATORS FOR SALE

300 kW Generators Capable of Powering Large Motors, Production Equipment, and Facility Loads

Agricultural, commercial and industrial users all find a use at 300 kW. Typical loads are groups of motors, pumps and fans, and the generator can back up an office building, medical equipment, telecommunications or data centers, or keep production processes running in manufacturing.

Where 300 kW Shows Up in Agricultural and Processing Operations

Large-scale agricultural operations — grain elevators, processing facilities, irrigation districts covering significant acreage — are a common but often overlooked application for generators in this range. These operations combine heavy motor loads (pumps, augers, processing equipment) with seasonal demand spikes that don’t always align with when utility power is most reliable. A 300 kW generator gives that kind of operation enough headroom to run multiple pieces of heavy equipment during harvest or peak season without treating the generator as a bottleneck.

Examining Load Before Committing to 300 kW

At 300 kW the load is usually a set of large motors, so start with the biggest two or three and learn how each one starts. Add lighting, controls and smaller drives, and compare the total against a seasonal peak rather than an average day. Our power calculator is a good starting point before bringing in a specialist. Look up the current at your voltage in our amperage chart.

Engine Displacement and Fuel Draw: Diesel and Gas at 300 kW

At 300 kW, buyers mostly choose between diesel and pipeline natural gas, and the spec sheets show the engines behind each fuel can differ a lot in size and emissions certification.

• Diesel example: Caterpillar’s D300 GC standby set uses a Cat C9 in-line six with 8.8 L (538 in³) of displacement. Its sheet lists EPA Tier 3 emissions, certification for stationary emergency use, and fuel use with the fan of 22.2 gal/hr at 100% load and 13.3 gal/hr at 50% load.
• Natural gas example: The Cummins C300N6 is built on the GTA855E engine with 14 L (854 in³) of displacement and a 300 kW standby rating. Cummins prints an estimated 4098 CFH of gas at full load and 2201 CFH at half load, and asks for 15 to 20 in. WC of inlet pressure at the generator connection.

For a quick diesel benchmark by size, our diesel fuel consumption chart lists the 300 kW row as 6.8 gal/hr at 1/4 load, 11.3 gal/hr at 1/2 load, 16.1 gal/hr at 3/4 load, and 21.5 gal/hr at full load. Those figures are for diesel sets only; the chart is not intended for natural gas units, so check the gas manufacturer’s sheet instead. On the electrical side, the 300 kW line of our amperage chart shows 1040 amps at 208V and 451 amps at 480V. Our power calculators can help you check those numbers against your own loads. Diesel generators and natural gas generators sit in separate categories with the fuel named on each unit.

Reading kVA Labels on Towable 300 kW Generators

Mobile units in this class are often named by kVA, so read the rating line before you assume a towable “300” delivers 300 kW. Multiquip’s DCA300SSJU4F3 is a good example: its data sheet rates it at 240 kW (300 kVA) prime and 264 kW (330 kVA) standby. Under the enclosure is a John Deere 6090HFG06 with 9.0 liters (549.2 in3) across 6 cylinders. It is EPA Tier 4 Final certified and uses EGR, DOC, and SCR, so a 29.8-gallon DEF tank sits alongside the 430.6-gallon fuel tank.

• Towing weight: On the MQ TRLR300EV trailer, Multiquip lists 14,140 lbs. dry and 17,930 lbs. wet.
• Trailer package: The optional package is built to NHTSA regulations, with electronic or surge brakes on all axles.
• Extended run: Optional double-wall, UL142-listed sub-base fuel cells are offered in 12-hour and 24-hour minimum run time versions.
• Noise: The sound-attenuated housing is rated at 72 dB(A) at full load from 23 feet.

Anything on a trailer is filed under trailer-mounted generators.

Larger Engines, Higher Tiers: Pricing Pressure at 300 kW

Two 300 kW generators can carry very different price tags once you look at what is inside them and what they are certified for. Points worth comparing:

• Emissions tier: A stationary emergency unit such as the Caterpillar D300 GC is listed at EPA Tier 3, while a mobile unit such as the Multiquip DCA300SSJU4F3 is Tier 4 Final and needs SCR aftertreatment and DEF. The added hardware and the intended use both shape cost.
• Engine and displacement: Engine family and size differ by maker; the Cat C9 in the D300 GC is 8.8 L, and the Cummins GTA855E in the C300N6 is 14 L.
• Standby or prime rating: Caterpillar defines standby as typical use of 200 hours per year, with a 500-hour annual maximum. A unit sold for continuous or prime duty is a different purchase from one meant only for outages.
• Condition and history: Compare new industrial generators with used industrial generators, paying attention to run hours and service records.
• Fuel and tank setup: Diesel versus natural gas, plus extras like double-wall sub-base fuel cells, move the total.
• Mounting and freight: Skid or trailer, enclosure choice, and the distance to your site all matter.

Contact us when you are ready to price a 300 kW unit.

Essential Operations Protected by 300 kW Backup

A 300 kW set is typically used where an outage stops production rather than just comfort: pumping, conveying, refrigeration and similar plant.

From Office Building to Large Retail: Sizing Around 300 kW

Your Situation	Better Fit
Single office building or smaller commercial site	250 kW generator
Large agricultural operation, mid-size manufacturing, data center support	300 kW (this page)
Expansive manufacturing facility or large retail establishment	350 kW generator

A Decade-Long Track Record on 300 kW Sets

More than a decade of supplying generators lies behind each 300 kW unit we carry. Before a unit is listed it has to pass a 22-point check, and once sold it is covered by the 30-day IronClad warranty. Our service and maintenance team is available whenever it needs attention. Look through the inventory or contact us.

Navigating Commercial Generator Choices Around 300 kW

If 300 kW is more than the site needs, our 150 kW generator serves small to mid-sized enterprises, from office loads to HVAC and data center backup. For more capacity, 350 kW generators fit expansive manufacturing facilities and sizable retail establishments.