Cummins QSX15G17 vs Perkins 2806J-E18TAG1
The Cummins QSX15G17 and Perkins 2806J-E18TAG1 are both diesel generator engines in a similar power class. Both are rated at roughly 618 kVA. Displacement is 15 L versus 18 L. The table below compares their full specifications side by side.
| Specification | Cummins QSX15G17 | Perkins 2806J-E18TAG1 |
|---|---|---|
| Headline rating | 625 kVA | 610 kVA |
| Standby (50 Hz) | — | 488 kWe |
| Prime (50 Hz) | — | 444 kWe |
| Standby (60 Hz) | 500 kWe | — |
| Prime (60 Hz) | 455 kWe | — |
| Displacement | 15 L | 18 L |
| Configuration | L6 | L6 |
| Cylinders | 6 | 6 |
| Rated speed | 1,800 RPM | 1,500 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | U.S. EPA Final Tier 4 | Euro Stage V / U.S. EPA Final Tier 4 |
| Dry weight | — | — |
| Origin | United States | United Kingdom |
Choosing between Cummins QSX15G17 and Perkins 2806J-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. The Cummins QSX15G17 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.