Cummins C650N6 vs Generac SG625
The Cummins C650N6 and Generac SG625 are both natural gas generator engines in a similar power class. Both are rated at roughly 797 kVA. Displacement is 50.3 L versus 33.9 L. The table below compares their full specifications side by side.
| Specification | Cummins C650N6 | Generac SG625 |
|---|---|---|
| Headline rating | 813 kVA | 781 kVA |
| Standby (50 Hz) | — | — |
| Prime (50 Hz) | — | — |
| Standby (60 Hz) | 650 kWe | 625 kWe |
| Prime (60 Hz) | — | — |
| Displacement | 50.3 L | 33.9 L |
| Configuration | V16 | V12 |
| Cylinders | 16 | 12 |
| 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 C650N6 and Generac SG625
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 Cummins C650N6 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.