Cummins K38N-G5 vs Generac SG500
The Cummins K38N-G5 and Generac SG500 are both natural gas generator engines in a similar power class. Both are rated at roughly 625 kVA. Displacement is 37.8 L versus 25.8 L. The table below compares their full specifications side by side.
| Specification | Cummins K38N-G5 | Generac SG500 |
|---|---|---|
| Headline rating | 625 kVA | 625 kVA |
| Standby (50 Hz) | — | — |
| Prime (50 Hz) | 500 kWe | — |
| Standby (60 Hz) | — | 500 kWe |
| Prime (60 Hz) | 500 kWe | 455 kWe |
| Displacement | 37.8 L | 25.8 L |
| Configuration | V12 | V12 |
| Cylinders | 12 | 12 |
| Rated speed | 1,500 / 1,800 RPM | 1,800 RPM |
| Fuel | Natural Gas | Natural Gas |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | Unregulated | Unregulated |
| Dry weight | — | — |
| Origin | China | United States |
Choosing between Cummins K38N-G5 and Generac SG500
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.