Cummins QST30G1 vs Perkins 2806A-E18TTAG4
The Cummins QST30G1 and Perkins 2806A-E18TTAG4 are both diesel generator engines in a similar power class. Both are rated at roughly 782 kVA. Displacement is 30 L versus 18 L. The table below compares their full specifications side by side.
| Specification | Cummins QST30G1 | Perkins 2806A-E18TTAG4 |
|---|---|---|
| Headline rating | 783 kVA | 780 kVA |
| Standby (50 Hz) | 626 kWe | 624 kWe |
| Prime (50 Hz) | 582 kWe | 565 kWe |
| Standby (60 Hz) | 751 kWe | 710 kWe |
| Prime (60 Hz) | 700 kWe | 642 kWe |
| Displacement | 30 L | 18 L |
| Configuration | V12 | L6 |
| Cylinders | 12 | 6 |
| Rated speed | 1,500 / 1,800 RPM | 1,500 / 1,800 RPM |
| Fuel | Diesel | Diesel |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | Unregulated | Unregulated |
| Dry weight | — | — |
| Origin | United States | United Kingdom |
Choosing between Cummins QST30G1 and Perkins 2806A-E18TTAG4
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 Cummins QST30G1 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.