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CAT CLASS: HQ-10735

150-300 kW Towable Diesel Generator

The 150-300 kW towable diesel generator class delivers 190-284 kVA of three-phase power for applications requiring robust, mobile temporary service. This mid-to-upper tier bridges the gap between smaller backup units and the utility-scale 300-600 kW class, serving building-wide power demands and industrial process loads. Units in this range typically carry 172-275 gallons of diesel fuel and mount on road-towable trailers.

114
Models
24
Brands
Towable Diesel Generator

Cat classes

Pick a size class: capacity and reach differ across the range.

Key specifications

SpecificationTypical rangeWhat it means
Power output190-284 kVAThree-phase output suitable for building service panels and heavy process equipment.
Fuel capacity172-275 galOnboard diesel storage enabling 24-72 hours of continuous runtime depending on load.
Voltage configurations208/120 V, 480/277 VStandard commercial and industrial voltages with neutral available for mixed loads.
Trailer formatDOT-compliant tandem-axleHighway-legal towable chassis with brakes, lights, and pintle or ball coupler.

How to choose

Select the 150-300 kW class when total connected load, including startup inrush for motors and HVAC, exceeds the capacity of the 60-150 kW Towable Diesel Generator but does not require the 300-600 kW Towable Diesel Generator tier. This range suits temporary utility service for mid-sized commercial buildings, outdoor events with full catering and lighting infrastructure, and industrial sites running pumps, conveyors, or welding equipment. For peak demands above 275 kVA or mission-critical applications requiring N+1 redundancy at the 200+ kW level, the 300-600 kW class offers greater headroom and often includes integrated switchgear.

What this size handles

  • Temporary service for a 50,000-square-foot office building during utility transformer replacement
  • Primary power for a remote pump station dewatering a large excavation or tunneling operation
  • Backup power for a manufacturing facility maintaining CNC machines and welding bays during a planned outage
  • Outdoor festival with multiple stages, sound reinforcement, food-service trailers, and site lighting
  • Data center or telecom switching facility requiring uninterrupted load during a scheduled utility cutover
  • Construction project supplying power to multiple tower cranes, batch plants, and site offices

Safety & operation

  • Install ground rods and verify bonding before energizing loads; consult NFPA 70 (National Electrical Code) Article 250 for grounding and Article 445 for generators
  • Maintain clearances around exhaust outlet: typically 10-15 feet from combustible materials and building air intakes to prevent carbon monoxide intrusion
  • Secure trailer with wheel chocks and stabilizer jacks; ensure firm, level footing to prevent vibration-induced fuel or coolant leaks
  • Implement lockout/tagout procedures during refueling or maintenance; never open fuel caps or service filters while engine is running or hot

Transport & logistics

  • Tandem-axle trailer requires a Class 7 or Class 8 truck, heavy-duty pickup (F-550/5500-class), or tractor with appropriate pintle hitch or fifth-wheel adapter
  • Total weight typically 8,000-15,000 pounds; verify road permits and bridge ratings for over-dimension or overweight loads in some jurisdictions
  • Site placement may require forklift or small crane if terrain precludes direct towing to final position

Power & supply

  • Units consume ultra-low-sulfur diesel (ULSD) at rates of 10-20 gallons per hour under full load; plan for daily or twice-daily refueling on extended-duration jobs
  • Output via cam-lock, pin-and-sleeve, or panel-mount circuit breakers; distribution typically handled by separate power-distribution panels or temporary switchgear
  • Generator controller monitors voltage, frequency, and engine parameters; many models include remote monitoring via cellular or satellite telemetry

Frequently asked

What is the difference between kW and kVA ratings?
Kilowatts (kW) measure real power delivered to resistive loads; kilovolt-amperes (kVA) account for reactive power from inductive loads like motors. A generator rated 250 kW at 0.8 power factor delivers approximately 312 kVA. Size the generator on kVA to accommodate both resistive and inductive equipment.
How long will a 150-300 kW unit run on a single tank?
Runtime depends on load. At 75 percent load, expect 1.5-2.0 hours per 10 gallons of fuel. A 250-gallon tank may provide 36-48 hours at half load, but only 12-18 hours at full rated output. Continuous operation requires scheduled refueling or auxiliary fuel storage.
Can this size serve as the primary service entrance for a building?
Yes, with proper load calculations and temporary-service approval from the authority having jurisdiction. Install an approved transfer switch or interlock to prevent backfeed if utility service is also present. The generator must be sized for the building's calculated demand load plus 25 percent margin per NEC Article 220.

Compare popular models

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Normalised to the same units. A dash means the figure was not published.

ModelPower outputFuel capacity
Generac MDE330 264.0 kVA-
Generac MGG450 360.0 kVA-
Generac MGG280N2 237.0 kVA-
Generac MDG250DF4 200.0 kVA-
Chicago Pneumatic CPG 250 T4F -385.0 gal
Chicago Pneumatic CPG 330 T4F -385.0 gal

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Sources

Every specification is verified against the manufacturer's published data, with the source linked for reference.

150-300 kW Towable Diesel Generator

14 models · Every spec cited to source