Niigata 18V28AGS vs Wärtsilä 12V34SG
Compare Niigata 18V28AGS and Wärtsilä 12V34SG by catalog output, operating duty, frequency and engine specifications. Their listed displacements are 432 L and 435.9 L, respectively. Start with the same duty and frequency, then check each model’s source and package conditions. These records alone do not establish interchangeability.
| Specification | Niigata 18V28AGS | Wärtsilä 12V34SG |
|---|---|---|
| Standby electrical (50 Hz) | Not listed | Not listed |
| Prime electrical (50 Hz) | 6,000 kWe | 5,840 kWe |
| Standby electrical (60 Hz) | Not listed | Not listed |
| Prime electrical (60 Hz) | Not listed | 5,580 kWe |
| Other recorded mechanical power (duty unspecified) | 6,250 kW | 5,840 kW |
| Displacement | 432 L | 435.9 L |
| Configuration | V18 | V12 |
| Cylinders | 18 | 12 |
| Recorded engine speed | 750 RPM | 750 RPM |
| Fuel | Natural Gas | Natural Gas |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Recorded emissions classification | Unregulated | Unregulated |
| Dry weight | Not listed | Not listed |
| Origin | Japan | Finland |
Compare matching ratings
Read across a row to compare the same operating duty and frequency. kWe is electrical output; mechanical kW is power at the engine shaft. kVA is apparent electrical power and is shown only when kWe is missing, without converting it. “Not listed” means the record lacks that rating, not zero output. Continuous and prime duties are kept separate. Check source documents, units and site conditions before comparing values.
An emissions classification in the catalog is not proof of certification for your engine or installation. Confirm the exact model, applicable documents and generator configuration.
Niigata 18V28AGS: Review the model record and available supporting documents
Wärtsilä 12V34SG: Review the model record and available supporting documents
Choosing between Niigata 18V28AGS 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.