51 40–45 kw diesel generator models side by side — power, phase, sound level, weight and fuel tank capacity, compiled from manufacturer specification sheets.
| Model | Standby | Phase | Sound | Weight | Fuel tank |
|---|---|---|---|---|---|
| Kohler 40EKOZD | 40.0 kW | 1 | — | 551.0 kg | — |
| Kohler 40EFOZ | 40.0 kW | 3 | — | 943.0 kg | — |
| Kohler 40EORZD | 40.0 kW | — | — | — | — |
| Kohler 40EOZ | 40.0 kW | 3 | — | 910.0 kg | — |
| Generac ED040 | 40.0 kW | — | — | — | — |
| Olympian GEP50-7 | 40.0 kW | — | — | 871.0 kg | 219.0 L |
| MTU 4R0113 DS40 | 40.0 kW | 3 | 80.5 dBA | 943.0 kg | — |
| Cummins/Onan C40 D6 | 40.0 kW | 3 | — | 945.0 kg | 200.0 L |
| Caterpillar C4.4 | 40.0 kW | 3-Phase | — | 1029.0 kg | 250.0 L |
| Caterpillar D40 | 40.0 kW | 3 phase | — | 306.0 kg | — |
| Caterpillar D40-6 | 40.0 kW | single | — | — | — |
| MQ Power DCA45USIXF | 40.0 kW | switchable | 58.0 dBA | 1700.0 kg | 751.0 L |
| Caterpillar C2.2 | 40.0 kW | — | 66.5 dBA | 530.0 kg | — |
| AKSA APD-ULJ40 | 40.0 kW | 3PH | — | — | — |
| MTU 4R0113 DS40 SCAQMD | 40.0 kW | — | — | — | — |
| MTU MTU 4R0113 DS40 | 40.0 kW | — | 80.5 dBA | 943.0 kg | — |
| aurora AGi40H | 40.0 kW | — | — | 173.0 kg | 45.0 L |
| Westquip WQ40T4H | 40.0 kW | — | — | 625.0 kg | — |
| Cummins/Onan DGAE | 40.0 kW | I,3 | — | — | — |
| Cummins/Onan C40D6R | 40.0 kW | Wye, 3-phase | — | 1490.0 kg | — |
| Olympian GEP50 | 40.0 kW | 3 Phase | — | 840.0 kg | 176.0 L |
| Toyota 32-8FG10 | 40.0 kW | — | — | — | 45.0 L |
| Toyota 62-8FD10 | 40.0 kW | — | — | — | 45.0 L |
| Iveco/FPT GE NEF 45M | 40.0 kW | — | — | — | — |
| Generac RD040 | 40.0 kW | 1Ø,3Ø | 65.0 dBA | 886.0 kg | 257.4 L |
| Cummins/Onan DEG-515R | 40.0 kW | 1 | — | — | — |
| Cummins/Onan 40DDB | 40.0 kW | 1-3 | — | — | — |
| Emsa E IV ST 0050 | 40.0 kW | — | — | 970.0 kg | — |
| Olympian D40P4 | 40.0 kW | — | — | — | — |
| Echo DGK45F | 40.0 kW | 3 | 66.0 dBA | 1195.0 kg | 300.0 L |
| kWiet Power DGK125F | 40.0 kW | Single- and three-phase | 58.0 dBA | 625.0 kg | — |
| Olympian D40P3 | 40.0 kW | — | — | — | — |
| Olympian D40P2 | 40.0 kW | — | — | — | — |
| Mitsubishi 40REOZT | 41.0 kW | — | — | — | — |
| Kohler 40REOZK | 42.0 kW | — | — | 787.0 kg | — |
| Kohler 40REOZT | 42.0 kW | Single | 65.0 dBA | 1769.0 kg | — |
| Atlas Copco QES 50 | 42.0 kW | — | 69.0 dBA | 896.0 kg | 116.0 L |
| Mitsubishi MDG40 | 42.0 kW | 1-3 switchable | — | — | — |
| kWiet Power DGK180F | 42.0 kW | Single- and three-phase | 58.0 dBA | 625.0 kg | — |
| Hatz 3M41 | 43.3 kW | — | — | 333.0 kg | — |
| MTU 4R0113 DS55 | 44.0 kW | 3 | 77.6 dBA | 943.0 kg | — |
| Cummins/Onan C55 D5 | 44.0 kW | 3 | — | 955.0 kg | — |
| Olympian GEP55-3 | 44.0 kW | 3 | — | 863.0 kg | 219.0 L |
| Generac MMG45IF4 | 44.0 kW | three phase | 66.0 dBA | 1525.0 kg | 379.0 L |
| Kubota V2403-M-T-E3B | 44.0 kW | Counterclockwise Viewed on Flywheel | — | 1960.0 kg | — |
| AKSA AD44 | 44.0 kW | 3 | 65.0 dBA | 800.0 kg | 100.0 L |
| Emsa E IV ST 0055 | 44.0 kW | — | — | 970.0 kg | — |
| Cummins/Onan BCC 55-50 | 44.0 kW | 3 | — | — | 232.0 L |
| FG Wilson P55-1ES | 44.0 kW | 3 | — | — | — |
| Morse GC | 44.5 kW | 3 | — | — | 159.0 L |
| Morse GCRS-40-40 | 44.5 kW | 3 | — | — | 159.0 L |
Among 40–45 kW Diesel generators in this comparison, the MQ Power DCA45USIXF is quietest at 58.0 dBA.
Among 40–45 kW Diesel generators in this comparison, the aurora AGi40H is lightest at 173.0 kg dry weight.
Among 40–45 kW Diesel generators in this comparison, the MQ Power DCA45USIXF has the largest fuel tank at 751.0 L.
Not every model reports every spec — blanks mean the source document didn't state that figure, not that the value is zero.