Cummins C45N6 vs Generac SG045
The Cummins C45N6 and Generac SG045 are both natural gas generator engines in a similar power class. Both are rated at roughly 56 kVA. Displacement is 5.9 L versus 4.43 L. The table below compares their full specifications side by side.
| Specification | Cummins C45N6 | Generac SG045 |
|---|---|---|
| Headline rating | 56 kVA | 56 kVA |
| Standby (50 Hz) | — | — |
| Prime (50 Hz) | — | — |
| Standby (60 Hz) | 45 kWe | 45 kWe |
| Prime (60 Hz) | — | 41 kWe |
| Displacement | 5.9 L | 4.43 L |
| Configuration | L6 | L4 |
| Cylinders | 6 | 4 |
| 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 C45N6 and Generac SG045
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.