Caterpillar G3520C vs Cummins QSV91G
The Caterpillar G3520C and Cummins QSV91G are both biogas generator engines in a similar power class. Both are rated at roughly 2,490 kVA. Displacement is 84.2 L versus 91.6 L. The table below compares their full specifications side by side.
| Specification | Caterpillar G3520C | Cummins QSV91G |
|---|---|---|
| Headline rating | 2,480 kVA | 2,500 kVA |
| Standby (50 Hz) | — | — |
| Prime (50 Hz) | 1,984 kWe | 2,000 kWe |
| Standby (60 Hz) | — | — |
| Prime (60 Hz) | 1,950 kWe | — |
| Displacement | 84.2 L | 91.6 L |
| Configuration | V20 | V18 |
| Cylinders | 20 | 18 |
| Rated speed | 1,500 / 1,800 RPM | 1,500 RPM |
| Fuel | Biogas | Natural Gas |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | U.S. EPA Stationary | Unregulated |
| Dry weight | — | — |
| Origin | United States | United States |
Choosing between Caterpillar G3520C and Cummins QSV91G
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 QSV91G has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.