CAT CLASS: HQ-10731

3-7 kW Portable Generator

The 3-7 kW portable generator is the everyday jobsite workhorse, sized to run a circular saw and compressor simultaneously or supply power for a small crew's corded tools. This band sits second on the portable generator ladder, above the up-to-3-kW units and below the 7-12 kW models. It balances portability with enough capacity to support mid-duty power demands without requiring dedicated transport.

269

Models

Brands

Cat classes

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

Key specifications

Specification	Typical range	What it means
Power output	5.0-8.0 kVA	Continuous capacity to support multiple corded tools or a combination of saw and compressor loads
Fuel capacity	4.9-6.6 gal	Runtime between refueling, typically 8-12 hours at half load depending on engine efficiency

How to choose

This size is appropriate when jobsite power demand exceeds a single large tool but does not require running multiple heavy machines at once. For powering only hand tools, chargers, or lights, the up-to-3-kW portable generator band offers easier transport and lower fuel consumption. When simultaneous operation of multiple compressors, welders, or larger saws is required, the 7-12 kW portable generator band provides the necessary headroom without overloading circuits.

What this size handles

Framing crew running pneumatic nailers via compressor and charging stations
Small remodel with circular saw, miter saw, and dust extraction running concurrently
Outdoor event setup powering PA system, lighting, and food service equipment
Landscape construction using string trimmers, blowers, and electric concrete mixers
Mobile service operations requiring welding equipment and grinders intermittently
Emergency backup for residential HVAC and refrigeration during short outages

Safety & operation

Carbon monoxide risk requires outdoor placement with exhaust directed away from occupied structures and work areas
Load management necessary to prevent overloading; simultaneous startup of multiple motors can exceed rated capacity even when running load is within limits
Hot surfaces and exhaust components remain hazardous after shutdown; cooling period required before transport or refueling
Ground fault protection and proper grounding reduce shock hazards, especially in wet conditions or when powering hand-held tools

Transport & logistics

Most units in this band include integrated wheel kits and fold-down handles for one-person maneuvering across level ground
Weight typically allows loading into pickup beds or small utility trailers without mechanical assist
Compact footprint fits standard truck beds and does not require dedicated towing equipment

Power & supply

Gasoline fuel; some models offer dual-fuel capability with propane conversion kits to extend runtime and reduce refueling frequency
Standard 120/240V outlets with GFCI protection; higher-output models include twist-lock receptacles for secure connections
Electric start models require periodic battery maintenance; recoil backup standard across the band

Frequently asked

What distinguishes this band from the 7-12 kW class in practical jobsite use?

The 3-7 kW band handles sequential or light simultaneous loads, a saw running while a compressor cycles, but lacks the capacity to start and run multiple high-draw tools at the same time. The 7-12 kW class supports concurrent operation of larger equipment without load management.

How does fuel capacity relate to typical workday duration in this size class?

At 50% load, units with 5-6.6 gallon tanks typically run 8-12 hours, covering a standard workday. Actual runtime depends on load cycling; continuous full-load operation may require mid-day refueling.

Can this size power a construction trailer with lights, outlets, and climate control?

Yes, if climate control is modest (resistance heating or small AC units). Startup surge from compressor-based HVAC and simultaneous tool use may approach or exceed capacity; the 7-12 kW band provides more headroom for trailer setups with larger climate loads.

Compare popular models

Find by spec →

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

Model	Power output	Fuel capacity
Multiquip DAC7000SSA3	6 kw	28.0 gal
Generac MLG8K	8.0 kVA	-
Multiquip DCA6SPX4F	6 kw	-
Chicago Pneumatic CPPG5.5W	5.0 kVA	6.6 gal
Chicago Pneumatic CPPG7W	6.5 kVA	6.6 gal
Craftsman CMXGGFMP03633	5.7 kVA	5.0 gal