Ultra Source: 15000 Watts & 17500 Watts

Two of the most powerful portable generators on the market complement Generac's line of residential and commercial automatic standby generators. Offering the best value in the business, Generac portable generators are ideal on the job site, as an emergency source of electricity at home and or commercial applications such as gas stations.

Generac 15000 watt Ultra Source Series generator

Impressive power at 15 and 17.5 kW

Both the 15,000-watt and 17,500-watt models are powered by a Generac OHVI industrial grade air-cooled engine. They deliver impressive power and smooth, quiet operation.

Manual Transfer Switch

Add Generac's manual transfer switch to the 17,500 watt model, and you have an excellent backup power source during an outage. There is no need to waste time searching for extension cords. The manual transfer switch can be pre-wired with up to 16 selected circuits. Simply start the generator, plug it in and flip a single switch to lock out the utility and transfer the load to the generator.

  • Breakthrough Design: 17.5 kW can start many 5-ton* A/C units
  • 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 Plug, plus GFCI Protected Duplex Outlets
  • 10-Hour Run-time at 1/2 Load
  • Wheel Kit and Heavy Duty Lifting Eye
  • 13" All-Terrain Tires
Ultra Source
  Portable Unit Only Generator with Manual Transfer Switch
Model 4852 5308
Rated Power (watts) 15,000 17,500
Surge Watts 22,500 26,250
Rated Amps @ 60 Hz
120/240, 1, 1.0 pf 		62.5 73
Engine GT990 GT990
Engine RPM 3600 3600
Engine Cooling Air Air
Fuel Capacity (gasoline) gallons 16 16
Dimensions (L" x W" x H") including frame 39 x 31 x 49 39 x 31 x 49
Unit Weight (lbs.) 450 475
Spec Sheet 0173570SBY 0173580SBY