Cummins QSV91G vs Jenbacher J612
The Cummins QSV91G and Jenbacher J612 are both natural gas generator engines in a similar power class. Both are rated at roughly 2,500 kVA. Displacement is 91.6 L versus 74.9 L. The table below compares their full specifications side by side.
| Specification | Cummins QSV91G | Jenbacher J612 |
|---|---|---|
| Headline rating | 2,500 kVA | 2,500 kVA |
| Standby (50 Hz) | — | — |
| Prime (50 Hz) | 2,000 kWe | 2,000 kWe |
| Standby (60 Hz) | — | — |
| Prime (60 Hz) | — | 1,986 kWe |
| Displacement | 91.6 L | 74.9 L |
| Configuration | V18 | V12 |
| Cylinders | 18 | 12 |
| Rated speed | 1,500 RPM | 1,500 / 1,500 RPM |
| Fuel | Natural Gas | Natural Gas |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | Unregulated | Unregulated |
| Dry weight | — | — |
| Origin | United States | Austria |
Choosing between Cummins QSV91G and Jenbacher J612
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.