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 2,505 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 | 2,509 kVA |
| Standby (50 Hz) | — | — |
| Prime (50 Hz) | 2,000 kWe | 2,007 kWe |
| Standby (60 Hz) | — | — |
| Prime (60 Hz) | — | — |
| Displacement | 91.6 L | 74.9 L |
| Configuration | V18 | V12 |
| Cylinders | 18 | 12 |
| Rated speed | 1,500 RPM | 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. The Jenbacher J612 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.