Cummins QSG12-G4 vs SDEC 6ETAA12.8-G21
The Cummins QSG12-G4 and SDEC 6ETAA12.8-G21 are both diesel generator engines in a similar power class. Both are rated at roughly 456 kVA. Displacement is 11.8 L versus 12.8 L. The table below compares their full specifications side by side.
| Specification | Cummins QSG12-G4 | SDEC 6ETAA12.8-G21 |
|---|---|---|
| Headline rating | 455 kVA | 456 kVA |
| Standby (50 Hz) | 364 kWe | 365 kWe |
| Prime (50 Hz) | 333 kWe | 331 kWe |
| Standby (60 Hz) | 418 kWe | 365 kWe |
| Prime (60 Hz) | 383 kWe | 331 kWe |
| Displacement | 11.8 L | 12.8 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 | Unregulated | China National Stage III / Unregulated |
| Dry weight | 1110 kg | — |
| Origin | China | China |
Choosing between Cummins QSG12-G4 and SDEC 6ETAA12.8-G21
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 SDEC 6ETAA12.8-G21 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.