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Generac MMG45IF4 Specs (Power | Voltage | Weight)

Written by Ernie Lo in Specs Last Updated August 18, 2026

The Generac MMG45IF4 compressor is listed with standby output of 44 kW, Diesel fuel, 60 Hz operation, 208 V, 480 V output, Three phase, rated current of 66 A, and sound level of 66 dBA @ 23 ft (7 m).

Generac Generator Specifications

Generator • Diesel • 60 Hz • Three phase

Standby power: 44 kWVoltage: 208 V, 480 VRated current: 66 ADry weight: 3,362 lb (1,525 kg)

Key specifications

44 kWStandby power
DieselFuel
208 V, 480 VVoltage
Three phasePhase
66 ARated current
3,362 lb (1,525 kg)Dry weight
66 dBA @ 23 ft (7 m)Sound level
60 HzFrequency

Visual model specs

Built only from this model’s supplied generator specifications.

Power output
Low 38 kW High 44 kW
Standby

44 kW

Prime

38 kW

Fluid capacities
Low 3.01 gal High 4.49 gal
Oil

3.01 gal

Coolant

4.49 gal

Model spec snapshot
Representative numeric specifications from this generator.
44 kWStandby
66 ACurrent
3,362.05 lbWeight
66 dBASound

How the Generac MMG45IF4 compares

This compares the supplied numeric specification with Generac generators in the same broad standby-power class where enough comparable data exists.

Standby power
44 kW
6% above avg
48th percentile
Dry weight
3,362 lb
83% above avg
98th percentile
Sound level
66 dBA
4% below avg
36th percentile
Oil capacity
3.01 gal
64% above avg
91st percentile
Standby power44 kW
Low 30 kWAverage 41.7 kWHigh 55 kW

About 6% above the similar-output Generac average. Around the 48th percentile for this field.

Dry weight3,362 lb
Low 821 lbAverage 1,841 lbHigh 3,333 lb

About 83% above the similar-output Generac average. Around the 98th percentile for this field.

Sound level66 dBA
Low 54 dBAAverage 68.9 dBAHigh 81.8 dBA

About 4% below the similar-output Generac average. Around the 36th percentile for this field.

Oil capacity3.01 gal
Low 1 galAverage 1.84 galHigh 4.29 gal

About 64% above the similar-output Generac average. Around the 91st percentile for this field.

This model Peer average

Generator information

Manufacturer Generac
Model MMG45IF4
Generator type Generator
Fuel Diesel
Frequency 60 Hz

Electrical output

Standby power 44 kW
Prime power 38 kW
Standby kVA 55.0
Voltage options 208 V, 480 V
Phase Three phase
Rated current 66 A
Circuit breaker 125 A

Engine, cooling and controls

Oil capacity 3.01 gal (11.4 L)
Coolant capacity 4.49 gal (17 L)
Maximum ambient 120 °F (49 °C)
Controller DSE 7310 MKII, Electronics Model 7310 MKII
Alternator Marathon 285PSL1700
Emissions Tier 4 Final

Physical specifications

Dry weight 3, 362 lb (1, 525 kg)
Dimensions (L × W × H) 150 × 57.1 × 83.1 in (3810 × 1450 × 2110 mm)
Sound level 66 dBA @ 23 ft (7 m)

Battery

Battery cranking 720 CCA
Battery voltage 12 V
Battery quantity 1

Fuel system and runtime

Fuel tank 100.1 gal (379 L)
Tank runtime 36.0 hr

Disclaimer: Specifications should be verified against the official owner’s manual and confirmed on the Generac USA website.

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Ernie Lo

Ernie Lo is a qualified web designer and web developer. He works as an IT support technician and website manager at Benleigh Vending, and he also fixes vending machines.

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