Manufacturer-documented fuel consumption for 16 45–50 kW Diesel generator sets — median 3.41 gal/h at full load, 1.85 gal/h at half load.
Compare 45–50 kW Diesel generator specs side-by-side →
| Model | kW | gal/h @ 50% | gal/h @ 100% | Tank (L) | Runtime @ 50% (h) |
|---|---|---|---|---|---|
| Cummins/Onan 45.0 DEF-15R | 45 | — | 3.51 | — | — |
| Cummins/Onan 45.0 DEF-3R | 45 | — | 3.51 | — | — |
| Cummins/Onan 45.0 DEF-9XR | 45 | — | 3.51 | — | — |
| Kohler 45EFOZ CJ | 45 | 2.55 | 4.66 | — | — |
| Laborde Products LPI-Y-45 | 45 | 1.60 | 3.10 | — | — |
| Laborde Products LPI-Y-45KC | 45 | 1.60 | 3.10 | — | — |
| MTU 20V4000 DS3300 | 45 | 82.42 | 158.26 | — | — |
| Simson-Maxwell SKW30 T6-T3 | 46 | — | 3.41 | 710 | — |
| Cummins/Onan 4BTAA3.3-G15 | 48 | 1.85 | 3.17 | — | — |
| Generac MMG55DF4 | 48 | 2.30 | 2.06 | 379 | 43.6 |
| Generac RD048 | 48 | 0.22 | 0.39 | 235 | 276.1 |
| Kohler 48REOZK4 | 48 | 1.69 | 3.41 | 386 | 60.3 |
| Kohler 55REOZT4 | 48 | 1.32 | 3.41 | 386 | 77.2 |
| Olympian GEP65-9 | 48 | 2.01 | 3.94 | 219 | 28.8 |
| Westquip WQ50T4 | 48 | 1.90 | 3.28 | 312 | 43.3 |
| Simson-Maxwell SDAC50 T6-T3 | 49 | — | 5.10 | 509 | — |
Figures from each model’s own manufacturer documentation (spec sheets and manuals); runtime = documented tank capacity ÷ consumption at 50% load. Verify against the datasheet for your exact configuration.
Across 16 models with manufacturer data, full-load consumption runs 0.39–158.26 gal/h (median 3.41); at 50% load the median is 1.85 gal/h.
At 50% load, documented tank sizes give 28.8–276.1 hours (median 51.9 h) across 6 models.