Doosan DB58 vs FPT NEF45SM1X
The Doosan DB58 and FPT NEF45SM1X are both diesel generator engines in a similar power class. Both are rated at roughly 65 kVA. Displacement is 5.8 L versus 4.5 L. The table below compares their full specifications side by side.
| Specification | Doosan DB58 | FPT NEF45SM1X |
|---|---|---|
| Headline rating | 64 kVA | 65 kVA |
| Standby (50 Hz) | 51.3 kWe | — |
| Prime (50 Hz) | 48 kWe | — |
| Standby (60 Hz) | — | 52 kWe |
| Prime (60 Hz) | — | 47 kWe |
| Displacement | 5.8 L | 4.5 L |
| Configuration | L6 | L4 |
| Cylinders | 6 | 4 |
| Rated speed | 1,500 RPM | 1,800 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | U.S. EPA Tier 1 | U.S. EPA Tier 3 |
| Dry weight | — | — |
| Origin | South Korea | Italy |
Choosing between Doosan DB58 and FPT NEF45SM1X
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 FPT NEF45SM1X has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.