What is the difference between the MD750 and the SD750?

The MD750 is a modular (factory-paralleled) system designed for scalable, redundant power architectures. The MD750 with the 33.9L Mitsubishi V12 engine comes factory-configured with integrated paralleling controls, enabling plug-and-play expansion with additional MD units. The SD750 is a single-unit standalone generator at the same power rating. The modular approach provides N+1 redundancy, easier installation logistics, and the ability to service one unit while another continues operating. Note that the SD750 is also available with the Perkins 18.1L inline-6 engine.

What is the fuel consumption of the MD750?

At standby rating, fuel consumption is approximately 69.8 gallons per hour at full load, 47.7 gph at 75% load, 32.4 gph at 50% load, and 18.3 gph at 25% load per module.

What voltages are available?

The MD750 is available in three-phase configurations at 277/480V and 346/600V, both at 60 Hz.

Generac · MD Series (Modular Diesel)

Generac MD750

Name: Generac MD750
Brand: Generac
SKU: md750

750 kW standby / 675 kW prime · Diesel · Liquid-cooled

750 kW modular diesel standby generator system. Factory-paralleled configuration with Mitsubishi S12A2-Y2PTAW-2 33.9L V12 engine for N+1 redundancy.

Generac MD750

Specifications & details

Standby power: 750 kW / 675 kW prime
Voltage options: 277/480V, 346/600V
Frequency / Phase: 60 Hz · 3-phase
Engine: Mitsubishi S12A2-Y2PTAW-2 · 33.9L
EPA / Emissions: Tier 2
Alternator: Generac K0820124Y22

Commercial Manufacturing Healthcare Data Centers

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Overview#

The Generac MD750 is a 750 kW modular diesel standby generator system powered by a Mitsubishi 33.9-liter turbocharged and aftercooled V12 engine. Part of Generac's Modular Power System (MPS) platform, the MD750 is factory-configured with integrated paralleling controls and the Power Zone Pro Sync controller for automatic load sharing and synchronization. The 33.9L Mitsubishi V12 provides conservative loading at the 750 kW rating, contributing to engine longevity in standby applications.

Two MD750 modules provide 1,500 kW of total capacity with full N+1 redundancy -- equivalent to the flagship SD1500 but with independent serviceability and simplified logistics. The modular architecture is particularly valuable for data center and healthcare campus environments where maintenance windows must not compromise backup power availability. The MD750 also supports mixed configurations with other MD Series units for flexible system design.

Our Service Experience#

The MD750's Mitsubishi 33.9L V12 is a robust engine platform in this power class. The V12 configuration requires methodical maintenance planning for injector service and valve adjustments across both cylinder banks. Multi-unit modular installations multiply the maintenance scope, so we recommend a structured service schedule that staggers major maintenance across modules. Paralleling controller calibration should be verified at each annual service to ensure balanced load sharing and proper synchronization response times.

Engineering specifications

Physical

Length: 177.7 in
Width: 82.6 in
Height: 94 in
Dry weight: 22,496 lb

Fuel system & runtime

Fuel use @ full load: 69.8 GPH
Fuel use @ 75% load: 47.7 GPH
Fuel use @ 50% load: 32.4 GPH

Thermal & ventilation

Heat to coolant: 1,158,420 BTU/hr
Exhaust flow: 7,486 CFM
Exhaust temp: 932 °F
Combustion air: 2,820 CFM
Ventilation air: 31,800 CFM

Documents & downloads

Spec sheets & manuals

Spec sheet (datasheet)

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Estimate runtime for the Generac MD750

Adjust load percent and tank size to estimate runtime. Pre-filled with this model's spec where available.

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Generator size

Fuel

Fuel tank capacity

gal

Load

Override full-load GPH (optional)

GPH

Estimated runtime

3.7 hours(0.2 days)

Fuel consumption ≈ 53.85 GPH at 75% load. Estimate based on industry-typical 1800 RPM standby curves (≈0.07 GPH/kW at full load). Actual consumption varies by engine, ambient temperature, fuel quality, and tuning.

Service intervals

Manufacturer-recommended intervals for the Generac MD750 under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.

Oil & filter: Every 500 hours or 12 months
Air filter: Every 1000 hours
Fuel filter: Every 500 hours
Load bank test: Every 12 months

Common failure modes

What we've seen fail on this platform. Use as a service-planning reference, not a diagnostic — actual failure modes depend heavily on duty cycle and maintenance history.

Component	Symptom	Typical hours	Severity
Fuel quality / degradation	Hard starting, filter clogging, reduced power output	4,380+	moderate
Paralleling controller synchronization	Failed sync, load sharing imbalance, hunting	20,000+	moderate
Coolant system	Overheating, coolant leaks, degradation in dual-circuit system	12,000+	moderate
Battery	Failed to start, slow cranking	8,760+	minor

Frequently Asked Questions

What is the difference between the MD750 and the SD750?: The MD750 is a modular (factory-paralleled) system designed for scalable, redundant power architectures. The MD750 with the 33.9L Mitsubishi V12 engine comes factory-configured with integrated paralleling controls, enabling plug-and-play expansion with additional MD units. The SD750 is a single-unit standalone generator at the same power rating. The modular approach provides N+1 redundancy, easier installation logistics, and the ability to service one unit while another continues operating. Note that the SD750 is also available with the Perkins 18.1L inline-6 engine.
What is the fuel consumption of the MD750?: At standby rating, fuel consumption is approximately 69.8 gallons per hour at full load, 47.7 gph at 75% load, 32.4 gph at 50% load, and 18.3 gph at 25% load per module.
What voltages are available?: The MD750 is available in three-phase configurations at 277/480V and 346/600V, both at 60 Hz.

Compatible equipment

Transfer switches

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