Caterpillar C9 vs Cummins QSL9-G7
The Caterpillar C9 and Cummins QSL9-G7 are both diesel generator engines in a similar power class. Both are rated at roughly 330 kVA. The table below compares their full specifications side by side.
| Specification | Caterpillar C9 | Cummins QSL9-G7 |
|---|---|---|
| Headline rating | 330 kVA | 330 kVA |
| Standby (50 Hz) | 264 kWe | 264 kWe |
| Prime (50 Hz) | 240 kWe | 240 kWe |
| Standby (60 Hz) | 300 kWe | 300 kWe |
| Prime (60 Hz) | 270 kWe | 275 kWe |
| Displacement | 8.8 L | 8.8 L |
| Configuration | L6 | L6 |
| Cylinders | 6 | 6 |
| Rated speed | 1,500 / 1,800 RPM | 1,500 / 1,800 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | U.S. EPA Tier 3 | U.S. EPA Tier 3 |
| Dry weight | — | — |
| Origin | United States | United States |
Choosing between Caterpillar C9 and Cummins QSL9-G7
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.