Cummins QST30G2 vs Perkins 2806A-E18TTAG5
The Cummins QST30G2 and Perkins 2806A-E18TTAG5 are both diesel generator engines in a similar power class. Both are rated at roughly 855 kVA. Displacement is 30 L versus 18 L. The table below compares their full specifications side by side.
| Specification | Cummins QST30G2 | Perkins 2806A-E18TTAG5 |
|---|---|---|
| Headline rating | 860 kVA | 850 kVA |
| Standby (50 Hz) | 688 kWe | 680 kWe |
| Prime (50 Hz) | 643 kWe | 616 kWe |
| Standby (60 Hz) | 800 kWe | 710 kWe |
| Prime (60 Hz) | 740 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 QST30G2 and Perkins 2806A-E18TTAG5
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 QST30G2 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.