Generac GP20000E Portable Generator, 20,000W Running, 120/240V, Electric Start
The Generac GP20000E is a commercial-grade portable generator rated at 20,000 running watts and 22,500 starting watts at 120/240V, built for demanding backup duty, big equipment loads, farm and jobsite work, and emergency power for a whole home. Its fuel-efficient OHV engine displaces 817cc and uses electronic fuel injection, and the 14.2-gallon tank gives a runtime of up to 7.75 hours at 50% load.
Advanced electronic controls hold total harmonic distortion under 5%, so the generator can run sensitive electronics and appliances. Electric start uses the included battery, COsense carbon monoxide protection and low-oil pressure shutdown add safety, and an hour meter tracks maintenance. The tank has a built-in fuel gauge, and the unit is HomeLink transfer switch compatible.
Outlets include two 120V 20A GFCI duplex receptacles (5-20R), a 120V 30A twist-lock (L5-30R), a 120/240V 30A twist-lock (L14-30R) and a 120/240V 50A receptacle (14-50R). A hardened steel frame with a 1-1/4 in steel tube cradle, a handle that folds and locks, and never-flat 12-inch wheels make the 444 lb generator easier to move to where power is needed.
Highlights
20,000 running watts and 22,500 starting watts at 120/240 V
817cc OHV engine with electronic fuel injection and electric start
14.2-gallon tank: runs up to 7.75 hours at 50% load
Total harmonic distortion under 5% for sensitive electronics
Outlets: two 5-20R GFCI duplex, L5-30R, L14-30R and 14-50R
444 lbs; handle folds and locks; 12-inch never-flat wheels
Specifications
Brand | Generac |
Manufacturer part number | G0089390 |
Running watts | 20,000 W |
Starting watts | 22,500 W |
Voltage | 120/240 V |
Frequency | 60 Hz |
Engine | 817cc OHV with EFI |
Fuel tank capacity | 14.2 gallons |
Runtime at 50% load | Up to 7.75 hours |
Starting method | Electric start, battery included |
Unit weight | 444 lbs |
Total harmonic distortion | Less than 5% |
Outlets | (2) 120 V 20 A GFCI duplex (5-20R); (1) 120 V 30 A twist-lock (L5-30R); (1) 120/240 V 30 A twist-lock (L14-30R); (1) 120/240 V 50 A receptacle (14-50R) |
Wheels | 12 in never-flat |
Protection | COsense carbon monoxide protection; low-oil pressure shutdown |
Maintenance | Hour meter |
What's in the box
Battery for electric start
Good to know
Engine-driven equipment gives off carbon monoxide: run it outdoors only, away from doors, windows and vents.





