Cummins QSX15G7 vs SDEC SC25G690D2
The Cummins QSX15G7 and SDEC SC25G690D2 are both diesel generator engines in a similar power class. Both are rated at roughly 563 kVA. Displacement is 15 L versus 25.8 L. The table below compares their full specifications side by side.
| Specification | Cummins QSX15G7 | SDEC SC25G690D2 |
|---|---|---|
| Headline rating | 563 kVA | 563 kVA |
| Standby (50 Hz) | — | 450 kWe |
| Prime (50 Hz) | — | 400 kWe |
| Standby (60 Hz) | 450 kWe | — |
| Prime (60 Hz) | 410 kWe | — |
| Displacement | 15 L | 25.8 L |
| Configuration | L6 | V12 |
| Cylinders | 6 | 12 |
| Rated speed | 1,800 RPM | 1,500 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | U.S. EPA Tier 2 / EU Stage II | China II |
| Dry weight | — | — |
| Origin | United States | China |
Choosing between Cummins QSX15G7 and SDEC SC25G690D2
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.