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Job Site & Construction Generators

High-output generators for contractors and job sites. Gas, dual-fuel, and tri-fuel from Cummins, Simpson, Pulsar, and Ford.

5kW+ Output Options
4 Top Brands
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Find the Right Generator for the Job

Job site power comes down to total load, number of tools running at once, and fuel access on site. Start with your heaviest tool.

Framing & Finish Carpentry

Circular saws, nail guns, and compressors. A 5,000W unit covers a standard framing crew.

$849 – $1,200

Shop 5,000W–8,000W

Heavy Equipment & HVAC

Compressors, welders, and HVAC equipment need 9,500W or more to start clean.

$1,272 – $2,424

Shop 9,000W–12,000W

Dual & Tri-Fuel

Run on gas, propane, or natural gas. Stay running when the gas station is 10 miles away.

$873 – $2,757

Shop Dual & Tri-Fuel

Multi-Tool Sites

Running multiple crews or trades at once? Size up to 12,000W or use two generators in parallel.

$2,424 – $2,757

Shop 12,000W+

Home Backup

Need power at the job site and at home? Many job site generators double as home backup.

$4,385 – $6,863

Shop Home Standby

Battery Power Stations

Silent, no-fumes power for indoor finish work, sensitive tools, and enclosed spaces.

$599 – $3,999

Shop Battery Stations
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Hand-Picked For You

Top Picks: Start Here

Four generators sized for the most common job site loads. Not sure what size you need? Call or chat - our team knows these machines.

Best Entry-Level
Pulsar generators Pulsar PG5250BCO 5,250-Watt Dual-Fuel Portable Generator – CARB Compliant

Pulsar

Pulsar PG5250BCO 5,250 Watt Dual-Fuel Portable Generator with CO Sentry

$651.88

  • 5,250W output covers a compressor, circular saw, and lighting simultaneously
  • Runs on gas or propane - propane option keeps you running when gas is scarce
  • CO safety shutoff built in - required on most enclosed or semi-enclosed sites
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Best Value
Simpson Simpson PowerShot 7500W Portable Generator SPG7593E

Simpson

Simpson PowerShot 7500W Portable Generator SPG7593E

$999.00

  • 7,500W continuous output - runs multiple heavy tools at once
  • GFCI outlets built in - meets most job site safety requirements
  • Electric start with remote - no pull-cord at the start of every shift
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Heavy Duty
Cummins Dual-Fuel Generator Cummins Onan P9500df Dual-Fuel Generator - A058U967

Cummins

Cummins Onan P9500df Dual-Fuel Generator 9500W - A058U967

$1,272.00

  • 9,500W running output - handles welders, large compressors, and HVAC startup loads
  • Dual fuel: gas or propane - no dependency on a single fuel source
  • Cummins commercial-grade build - engineered for daily contractor use
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Maximum Output
Front view of Cummins tri-fuel inverter generator featuring control panel with buttons, switches, display screen, three outlets, ventilation grilles, and top handle—perfect for reliable home backup power.

Cummins

Cummins Onan P11000iTF Tri-Fuel Inverter Generator – 11,000W Portable Power for Home Backup & RVs

$2,424.00

  • 11,000W tri-fuel: gas, propane, or natural gas - runs wherever fuel is available
  • Clean sine wave output - safe for variable-speed tools and electronics on site
  • Quiet operation for a generator this size - 64 dB at 25% load
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Job Site & Construction Generators

Buying Guide

How to Choose a Job Site Generator

Sizing a job site generator comes down to three things: your heaviest tool starting load, how many tools run at the same time, and fuel access on site.

Step 1: Find Your Peak Starting Load

Every tool has a running wattage and a starting wattage. The starting wattage is higher and lasts only a fraction of a second, but your generator must handle it without tripping. A 30-gallon air compressor runs at 1,500W but starts at 4,500W. A large table saw runs at 1,800W but starts at 4,500W. Add up the starting wattage of your biggest tool plus the running wattage of everything else running simultaneously. That is your required generator output.

Sizing Guide by Crew Type

Framing crew with compressor and circular saws: 7,500W to 9,500W. HVAC installation with large compressors and power tools: 9,500W to 12,000W. Multi-trade site running welding, HVAC, and finish work simultaneously: 12,000W or parallel two generators. Interior finish work in enclosed spaces: consider a battery power station to eliminate fumes.

Fuel Type

Gasoline is the default for job sites. It is available everywhere and easy to transport. Dual-fuel models that also accept propane give you a backup when a gas station run is not practical. Tri-fuel generators add natural gas, which is useful on sites with a stubbed-in gas line. The Cummins P11000iTF is the only tri-fuel unit in this collection.

GFCI and Safety Requirements

OSHA requires GFCI protection on construction site receptacles. All Simpson PowerShot and Industrial generators include GFCI outlets. Verify requirements for your specific site and jurisdiction before purchase.

Frequently Asked Questions

Have a question about job site power? Our team has answers. Call or chat anytime.

Start with your heaviest tool's starting wattage, then add the running wattage of everything else you plan to run at the same time. A 15-amp circular saw draws about 1,800W running and surges to 2,400W on startup. A 30-gallon air compressor draws 1,500W running and surges to 4,500W. Running both plus job site lighting puts your total starting load around 8,000W. Size your generator to handle the peak starting load, not just the running load. For most framing and finish crews, a 7,500W to 9,500W generator is the right range. Multi-trade sites or sites running welding equipment need 11,000W or more.

OSHA requires GFCI protection for all 120V, 15 and 20-amp receptacles used on construction sites. Most job site generators include GFCI outlets as standard equipment. If yours does not, you can use an inline GFCI adapter. All Simpson PowerShot and Industrial generators include GFCI outlets. Verify your local requirements before use - OSHA standards are the federal floor, and some states or municipalities have stricter requirements.

Fuel flexibility eliminates the most common job site disruption: running out of gas on a remote site. A tri-fuel generator runs on gasoline, propane, or natural gas. If the site has a natural gas line stubbed in, you can run from the line without hauling fuel. If propane is on site for heating or equipment, you have a backup. Gasoline remains the fallback. The Cummins P11000iTF is our top-rated tri-fuel unit at 11,000W.

Yes, with the right generator. A typical 140-amp MIG welder draws 2,500 to 3,000W running and surges to 4,500W on arc start. A 225-amp stick welder draws 5,000 to 7,500W. You need a generator with continuous output rated above the welder's draw, plus enough surge capacity to handle the arc start. Inverter-based generators like the Cummins P11000iTF provide stable voltage that reduces spatter and improves weld quality compared to conventional generators. Size up by at least 20% above the welder's rated draw.

Yes. Mighty Generators is an authorized dealer for Cummins, Simpson, Pulsar, Ford, and all brands we carry. Every product ships with the full manufacturer warranty. Our team can assist with warranty claims if needed. No gray market products, no fine print.