Cummins QST30G2 vs SDEC 6KTAA25-G32.1
The Cummins QST30G2 and SDEC 6KTAA25-G32.1 are both diesel generator engines in a similar power class. Both are rated at roughly 855 kVA. Displacement is 30 L versus 25 L. The table below compares their full specifications side by side.
| Specification | Cummins QST30G2 | SDEC 6KTAA25-G32.1 |
|---|---|---|
| Headline rating | 860 kVA | 849 kVA |
| Standby (50 Hz) | 688 kWe | — |
| Prime (50 Hz) | 643 kWe | — |
| Standby (60 Hz) | 800 kWe | 679 kWe |
| Prime (60 Hz) | 740 kWe | 617 kWe |
| Displacement | 30 L | 25 L |
| Configuration | V12 | L6 |
| Cylinders | 12 | 6 |
| Rated speed | 1,500 / 1,800 RPM | 1,800 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | Unregulated | China National Stage III / Unregulated |
| Dry weight | — | — |
| Origin | United States | China |
Choosing between Cummins QST30G2 and SDEC 6KTAA25-G32.1
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 QST30G2 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.