Cummins QSB7G3 vs SDEC 6HTAA6.5-G22
The Cummins QSB7G3 and SDEC 6HTAA6.5-G22 are both diesel generator engines in a similar power class. Both are rated at roughly 175 kVA. Displacement is 6.7 L versus 6.5 L. The table below compares their full specifications side by side.
| Specification | Cummins QSB7G3 | SDEC 6HTAA6.5-G22 |
|---|---|---|
| Headline rating | 175 kVA | 175 kVA |
| Standby (50 Hz) | 140 kWe | 140 kWe |
| Prime (50 Hz) | 120 kWe | 126 kWe |
| Standby (60 Hz) | 150 kWe | 149 kWe |
| Prime (60 Hz) | 136 kWe | 135 kWe |
| Displacement | 6.7 L | 6.5 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 | U.S. EPA Tier 3 / EU Stage IIIA / China III | China National Stage III / Unregulated |
| Dry weight | — | — |
| Origin | United States / United Kingdom | China |
Choosing between Cummins QSB7G3 and SDEC 6HTAA6.5-G22
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.