Cummins QSJ2.4G vs MAN E 0834 E312
The Cummins QSJ2.4G and MAN E 0834 E312 are both natural gas generator engines in a similar power class. The Cummins QSJ2.4G is the higher-output unit (50 kVA vs 45 kVA). Displacement is 2.4 L versus 4.6 L. The table below compares their full specifications side by side.
| Specification | Cummins QSJ2.4G | MAN E 0834 E312 |
|---|---|---|
| Headline rating | 50 kVA | 45 kVA |
| Standby (50 Hz) | — | — |
| Prime (50 Hz) | — | 36 kWe |
| Standby (60 Hz) | 40 kWe | — |
| Prime (60 Hz) | — | 43 kWe |
| Displacement | 2.4 L | 4.6 L |
| Configuration | L4 | L4 |
| Cylinders | 4 | 4 |
| Rated speed | 1,800 RPM | 1,500 / 1,800 RPM |
| Fuel | Natural Gas | Natural Gas |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | U.S. EPA Stationary | Unregulated |
| Dry weight | — | — |
| Origin | United States | Germany |
Choosing between Cummins QSJ2.4G and MAN E 0834 E312
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 QSJ2.4G has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.