Cummins QSX15G9 vs Perkins 2806F-E18TAG1
The Cummins QSX15G9 and Perkins 2806F-E18TAG1 are both diesel generator engines in a similar power class. Both are rated at roughly 625 kVA. Displacement is 15 L versus 18 L. The table below compares their full specifications side by side.
| Specification | Cummins QSX15G9 | Perkins 2806F-E18TAG1 |
|---|---|---|
| Headline rating | 625 kVA | 625 kVA |
| Standby (50 Hz) | — | — |
| Prime (50 Hz) | — | — |
| Standby (60 Hz) | 500 kWe | 500 kWe |
| Prime (60 Hz) | 450 kWe | 455 kWe |
| Displacement | 15 L | 18 L |
| Configuration | L6 | L6 |
| Cylinders | 6 | 6 |
| Rated speed | 1,800 RPM | 1,800 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | U.S. EPA Tier 2 | U.S. EPA Final Tier 4 |
| Dry weight | — | — |
| Origin | United States | United States |
Choosing between Cummins QSX15G9 and Perkins 2806F-E18TAG1
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.