Cummins GTA855E vs Generac SG250
The Cummins GTA855E and Generac SG250 are both natural gas generator engines in a similar power class. Both are rated at roughly 310 kVA. Displacement is 14 L versus 14.2 L. The table below compares their full specifications side by side.
| Specification | Cummins GTA855E | Generac SG250 |
|---|---|---|
| Headline rating | 306 kVA | 313 kVA |
| Standby (50 Hz) | — | — |
| Prime (50 Hz) | — | — |
| Standby (60 Hz) | 245 kWe | 250 kWe |
| Prime (60 Hz) | 225 kWe | 225 kWe |
| Displacement | 14 L | 14.2 L |
| Configuration | L6 | L6 |
| Cylinders | 6 | 6 |
| Rated speed | 1,800 RPM | 1,800 RPM |
| Fuel | Natural Gas | Natural Gas |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | U.S. EPA Stationary | U.S. EPA Stationary |
| Dry weight | — | — |
| Origin | United States | United States |
Choosing between Cummins GTA855E and Generac SG250
Use this comparison as an engineering shortlist, then confirm the complete generator package against load profile, voltage, 50/60 Hz frequency, duty class, emissions rules, cooling margin, altitude, ambient temperature, enclosure design, controller features, and alternator sizing. The Generac SG250 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.