8 kW 10 kW 14 kW 17 kW 20 kW

20 kW Air-Cooled Standby Generator

Our NEW 20 kW model makes whole-house protection more affordable than ever before. With Generac's exclusive Quiet-Test™ feature, best-in-class True Power™ technology and a standard all aluminum enclosure, the 20 kW is also a tremendous value for those who need more power. For extra convenience, this model has a digital control panel, external main circuit breaker, system status LED and maintenance interval LED as well as an external GFCI outlet for outdoor power needs.

Convenient, Hands-Free Operation
No fueling. No manual start. No extension cords. Runs on natural gas or liquid propane

Clean, Smooth Power
True Power™ Technology provides safe operation of sensitive electronics

Powerful Output
Highest power output in its class

Quietest, Confident Operation
Patented Quiet-Test™ feature makes the 20 kW model as quiet as a car at idle during the weekly self-testing cycle.

Confident Operation
Automatic weekly exercise ensures protective response

Generac OHVI Industrial Engine
The only air-cooled engine designed specifically for generators

  • Long-run, long-life design: Over 3,000 hours of run time
  • High-torque design: Responds instantly to large electrical loads
  • Low-maintenance: 2 year, 200 hour service intervals

Ultimate Weather Protection
Ultimate Weather Protection: Aluminum enclosure for superior corrosion resistance

Base Fascia
Matching trim piece finishes off the new, cleaner design

UL Listed
For safety and certified power ratings

Generator Set
Transfer Switches
GenReady
Controls
Accessories
Model Number 5533
Rated Power (LP / NG) 20/18 kW
Rated Amps @ 60 Hz (LPV / NG)
240 V, 1Ø (LP / NG) 83.3/75
3 Phase Models NA
Surge Watts - 240V, 1 Ø 35,470
Surge Amps 147
Engine (Generac OHVI) 999cc / V-Twin
Alternator RPM 3600
Enclosure Aluminum
Quiet-Test™ Yes
Sound Level (dBA @ exercise) 60
(dBA @ normal operation) 66
Dimensions (L" x W" x H") 48x24x28
Compatible Transfer Switches RTS
Unit Weight (lbs.) 451
Full Spec Sheet Spec Sheet