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UltraSource 15000 Watts & 17500 Watts Generators

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Two of the Most Powerful Portable Generators on the Market


GUARDIAN's Ultra Source® portable generators are the most powerful portable generators on the market and offer the best value in the business. They supplement our complete line of residential and commercial automatic standby generators and are ideal for power on the job site or as an emergency source of electricity at home or in commercial applications such as gas stations.

Impressive Power
Our 15,000-watt and 17,500-watt models feature our own OHVI® 992cc industrial grade engine. This powerhouse is renowned for its reliability, long life, impressive power and smooth, quiet operation.

Manual Transfer Switch
The 17,500-watt model comes standard with our 60 Amp manual transfer switch, making it easy to use during an outage. With up to 16 pre-wired circuits, all that's required is to start the generator and plug it in. By flipping a switch, the utility is locked out and the load is transferred to the generator.


  • Circuit Coverage: Protects up to 16 circuits (17.5 kW model)
  • Automatic Voltage Regulator: Quality electrical output for sensitive electronics
  • Electronic Governor: Fast response to changing electrical loads
  • Generac OHVI® V-Twin Industrial Engine: The ONLY air-cooled engine designed specifically for generators
  • Longest Life Expectancy in the Industry: Over 3,000 hours of run time
  • Full Pressure Lubrication: Continuous lubrication of all vital engine parts for from moment of start up for ultimate engine protection
  • Spin-on Oil Filter: Automotive style for easy maintenance and prolonged engine life
  • 16 Gallon Fuel Tank
  • Automatic Idle Control
  • Electric Start Quick start
  • 50-amp High Power Outlet, Twistlock Outlet, plus GFCI Protected Duplex Outlets
  • 10-Hour Run-time at Load
  • Wheel Kit and Heavy Duty Lifting Eye
  • 13" All-Terrain Tires
  • All outlets circuit breaker protected
  • Starting battery included


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