CAT CLASS: HQ-10733

Up to 25 kW Towable Diesel Generator

Up to 25 kW towable diesel generators are the smallest tow-behind power units in the towable diesel class, designed to run a site trailer, a single light plant, or a pump for extended periods. These compact units sit at the bottom of the towable diesel generator ladder, bridging the gap between portable gasoline gensets and larger trailer-mounted diesel machines. They are typically left on site for weeks at a time, providing continuous low-to-moderate power for remote or temporary operations.

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

Key specifications

Specification	Typical range	What it means
Power output	2-27 kVA	Sufficient for single-load applications like a jobsite office, small pump, or light tower.
Fuel capacity	2-106 gal	Smaller tanks for ultra-compact units, larger tanks enable multi-day runtime without refueling.
Sized by	kW rating	Industry standard for diesel generators; distinguishes continuous load capacity from surge.

How to choose

This size is appropriate when the load consists of a single trailer, pump, or light plant that draws 25 kW or less continuously. For applications requiring power for multiple pieces of equipment, a larger jobsite office with HVAC, or running multiple welders simultaneously, the 25-60 kW Towable Diesel Generator band offers greater capacity and distribution flexibility. The up-to-25 kW class is optimized for simplicity, low fuel consumption, and unattended operation on remote sites where a single predictable load runs for days or weeks without intervention.

What this size handles

Powering a small site office trailer with lighting, computer, and space heater
Running a single dewatering pump in a remote trench or excavation
Supplying a standalone light tower for overnight security or perimeter lighting
Providing power to a remote monitoring station or telemetry equipment
Operating a single compressor or small concrete vibrator on a low-demand site
Energizing temporary fencing with electric gate operators

Safety & operation

Ensure adequate ventilation around the enclosure; diesel exhaust contains carbon monoxide and particulates.
Confirm load does not exceed the generator's continuous kW rating to prevent overheating and premature wear.
Inspect trailer coupling, safety chains, and breakaway systems before each move to ensure safe towing.
Ground the generator frame and bonding conductors per local electrical code to prevent shock hazards.

Transport & logistics

Most units in this class are mounted on single-axle or tandem-axle trailers with standard lunette rings or ball couplers, towable by 1/2-ton or 3/4-ton pickup trucks.
Compact footprint allows maneuvering into tight jobsite areas and positioning close to the load.
Smaller models may be lifted by forklift or skid-steer for placement where towing access is limited.

Power & supply

Output is typically 120/240V single-phase, delivered via twist-lock receptacles or a small breaker panel mounted on the enclosure.
Diesel fuel supply; larger tank models reduce refueling frequency to once every several days under moderate load.
No external power input required; units are self-contained and start via battery or recoil.

Frequently asked

What distinguishes this size from portable gasoline generators?

Towable diesel units in this class offer longer unattended runtime, greater fuel efficiency under continuous load, and trailer mobility, whereas portable gasoline gensets are lighter and easier to hand-move but require more frequent refueling.

How long can a unit in this class run on a full tank?

Runtime varies widely based on fuel capacity and load; a 20-gallon tank under 50% load may run 24-48 hours, while a 100-gallon tank can support several days of continuous operation.

When should a specifier move up to the 25-60 kW band?

When the combined load exceeds 25 kW, when multiple distribution circuits are needed, or when the application involves simultaneous operation of several moderate-draw devices such as heaters, welders, or larger pumps.

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

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