Generac MMG45 Mobile Diesel Generator
The Generac MMG45 is a versatile mobile diesel generator with standard containment, making it ideal for environmentally sensitive job sites, events, and emergency backup power applications. This towable unit delivers reliable 3-phase power with multiple voltage configurations.
Power Output
| Rating | kW | kVA |
|---|---|---|
| Prime Power | 38 | 47 |
| Standby Power | 44 | 55 |
Voltage Configurations
- Standard: 480/277V 3P, 208/120V 3P, 120/240V 1P (3-Position Switch)
- Optional: 600/346V 3P VFLEX, 240/120V 3P (4-Position Switch)
Engine Specifications
- Engine: Isuzu 2.2L Diesel
- Oil Change Interval: 500 hours
- Positive Air Shutdown: Optional
- Load Management: Optional ALD (Alternate Load Device)
Fuel System
- Standard Fuel Capacity: 100 gallons (379L)
- Optional Fuel Capacity: 160 gallons (606L)
- Runtime at 75% Prime: 36 hours
- DEF Capacity: Not Required
- Auxiliary Fuel Connections: Optional
Alternator
- Model: Marathon
- Excitation: Auxiliary Winding
- SUPERSTART: Standard
- Starting kVA: 138 @ 480V with 20% voltage dip
Control System
- Controller: DSE 7310 MKII
- PMG: Optional
- Paralleling: Not Available
Distribution
- Connection Lugs: Standard
- Cam Lock Sets: 1 Optional
- Buck Transformer: Optional
- 120V 20A GFCI Duplex Receptacles: 2 Standard
- 120/240V 50A CS6369 Twistlock Receptacle: 3 Standard
Enclosure and Transport
- Sound Level: 66 dB(A) at 23 ft at 100% PRP
- Containment: Standard
- Trailer: Single Axle (Dual Optional)
- Skid: Available
- CSA Certified: Yes
Cold Weather Operation
- Standard Operating Temp: 32F / 0C minimum
- With Cold Weather Options: -40F / -40C
- Cold Start Options: Optional

