Hatz 1D81C vs Perkins 403J-07G
The Hatz 1D81C and Perkins 403J-07G are both diesel generator engines in a similar power class. The Perkins 403J-07G is the higher-output unit (6 kVA vs 5 kVA). Displacement is 0.667 L versus 0.7 L. The table below compares their full specifications side by side.
| Specification | Hatz 1D81C | Perkins 403J-07G |
|---|---|---|
| Headline rating | 5 kVA | 6 kVA |
| Standby (50 Hz) | 4.2 kWe | 5 kWe |
| Prime (50 Hz) | 3.8 kWe | 5 kWe |
| Standby (60 Hz) | 5.1 kWe | — |
| Prime (60 Hz) | 4.6 kWe | — |
| Displacement | 0.667 L | 0.7 L |
| Configuration | L1 | L3 |
| Cylinders | 1 | 3 |
| Rated speed | 1,500 / 1,800 RPM | 1,500 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Air-Cooled | Liquid-Cooled |
| Emissions | U.S. EPA Tier 4 Interim | Unregulated |
| Dry weight | — | — |
| Origin | Germany | China |
Choosing between Hatz 1D81C and Perkins 403J-07G
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 Perkins 403J-07G has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.