Kawasaki KG-12 vs Wärtsilä 12V34SG
The Kawasaki KG-12 and Wärtsilä 12V34SG are both natural gas generator engines in a similar power class. The Wärtsilä 12V34SG is the higher-output unit (7,300 kVA vs 6,500 kVA). Displacement is 407.2 L versus 435.9 L. The table below compares their full specifications side by side.
| Specification | Kawasaki KG-12 | Wärtsilä 12V34SG |
|---|---|---|
| Headline rating | 6,500 kVA | 7,300 kVA |
| Standby (50 Hz) | — | — |
| Prime (50 Hz) | 5,200 kWe | 5,840 kWe |
| Standby (60 Hz) | — | — |
| Prime (60 Hz) | 5,000 kWe | 5,580 kWe |
| Displacement | 407.2 L | 435.9 L |
| Configuration | V12 | V12 |
| Cylinders | 12 | 12 |
| Rated speed | 750 / 900 RPM | 750 / 900 RPM |
| Fuel | Natural Gas | Natural Gas |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | Unregulated | Unregulated |
| Dry weight | — | — |
| Origin | Japan | Finland |
Choosing between Kawasaki KG-12 and Wärtsilä 12V34SG
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 Wärtsilä 12V34SG has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.