Generac SG275 vs PSI 18L
The Generac SG275 and PSI 18L are both natural gas generator engines in a similar power class. Both are rated at roughly 341 kVA. Displacement is 14.2 L versus 18.3 L. The table below compares their full specifications side by side.
| Specification | Generac SG275 | PSI 18L |
|---|---|---|
| Headline rating | 344 kVA | 338 kVA |
| Standby (50 Hz) | — | 270 kWe |
| Prime (50 Hz) | — | — |
| Standby (60 Hz) | 275 kWe | 350 kWe |
| Prime (60 Hz) | 248 kWe | — |
| Displacement | 14.2 L | 18.3 L |
| Configuration | L6 | V10 |
| Cylinders | 6 | 10 |
| Rated speed | 1,800 RPM | 1,500 / 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 Generac SG275 and PSI 18L
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 SG275 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.