Generac SG625 vs Waukesha VGF36GSI/GSID (L36GSI/GSID)
The Generac SG625 and Waukesha VGF36GSI/GSID (L36GSI/GSID) are both natural gas generator engines in a similar power class. Both are rated at roughly 778 kVA. Displacement is 33.9 L versus 36 L. The table below compares their full specifications side by side.
| Specification | Generac SG625 | Waukesha VGF36GSI/GSID (L36GSI/GSID) |
|---|---|---|
| Headline rating | 781 kVA | 775 kVA |
| Standby (50 Hz) | — | — |
| Prime (50 Hz) | — | — |
| Standby (60 Hz) | 625 kWe | 620 kWe |
| Prime (60 Hz) | — | 560 kWe |
| Displacement | 33.9 L | 36 L |
| Configuration | V12 | V12 |
| Cylinders | 12 | 12 |
| Rated speed | 1,800 RPM | 1,800 RPM |
| Fuel | Natural Gas | Natural Gas |
| Cooling | Liquid-Cooled | Liquid-Cooled |
| Emissions | U.S. EPA Stationary | Unregulated |
| Dry weight | — | — |
| Origin | United States | United States |
Choosing between Generac SG625 and Waukesha VGF36GSI/GSID (L36GSI/GSID)
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 Generac SG625 has the higher headline kVA rating in this pair, but site conditions and duty cycle can still change the final recommendation.