HomeGeneracGenerac MD800

Generac MD800 Generator Set

The Generac MD800 is a 800 kW (1000 kVA) Diesel standby generator set powered by a Mitsubishi S12A2-Y2PTAW-2 engine. It is available at 277/480 V and 346/600 V, Three-Phase-phase and 60 Hz. It holds about 100 L (26.4 gal) of oil and 246 L (65.0 gal) of coolant, with a maximum ambient rating of 50 °C. Starting uses 2 group-8 batteries at 12 V. The set measures 4515×2099×2389 mm (177.8×82.6×94.1 in) and weighs about 10204 kg (22496 lb). The same S12A2-Y2PTAW-2 engine also powers generator sets from AKSA, Kohler, Rudox Power Generation and Simson-Maxwell.

800 kW
Standby
33.93 L
Displacement
100.0 L
Oil capacity
1
Document types

How to read your Generac serial & model number →

Specifications

FuelDiesel
Frequency60.0 Hz
Standby power800 kW
Standby kVA1000
Prime power720 kW
EmissionsTier 2
ControllerInteliGen® NT Display
Oil capacity100.0 L
AlternatorK0912124Y22 (4-pole, Class H insulation)
Voltage options277/480 V, 346/600 V
PhaseThree-Phase
Power factor0.8
Battery group8D
Battery voltage12 VDC V
Battery quantity2
Coolant capacity246 L
Max ambient50 °C
Dimensions (L×W×H)4515×2099×2389 mm
Dry weight10204 kg

Engine

Mitsubishi S12A2-Y2PTAW-2
Oil capacity120.0 L
Coolant capacity303.0 L
Displacement33.93 L
AspirationTurbocharged
Rated speed1800 rpm

Maintenance & consumables

for the Mitsubishi S12A2-Y2PTAW-2
ItemSpecCapacityPart #Interval
Air filterDry, Replaceable Cartridge find
Fuel filter×3 find
Oil filterCartridge×3GM32057 Amazon eBay PartsGeek
Belt find
Coolant303.0 L
OilClass CD or CF oil (API service classification)120.0 L

Common questions

What is the power rating of the Generac MD800?

The Generac MD800 is rated 800 kW standby (1000.0 kVA).

What engine does the Generac MD800 use?

The Generac MD800 is powered by the Mitsubishi S12A2-Y2PTAW-2 engine.

What fuel does the Generac MD800 use?

The Generac MD800 runs on Diesel.

What is the oil capacity of the Generac MD800?

The Mitsubishi S12A2-Y2PTAW-2 engine in the Generac MD800 has an oil capacity of 120.0 liters.

What alternator does the Generac MD800 use?

The Generac MD800 uses a K0912124Y22 alternator. It has 4 poles. Insulation class H.

Parts

1
Part #DescriptionQtySystem
057-263DSE7410 MKII & DSE7420 MKII Operator Manual1Service part / kit PartsGeek

Service, wear & replacement parts referenced for this model and its engine — confirm the exact part for your serial number. See the full parts catalog to search and cross-reference.

Fuel consumption

RatingLoadL/hgal/h
Standby25%73.019.5
Standby50%131.034.6
Standby75%193.050.9
Standby100%282.074.4

Available documents

Spec sheet — Generac 800kW MD800 Diesel Generator 33.9L (Generac)Spec sheet — md800-0l1426a (Generac)Spec sheet — md800-800kw-diesel-generator-specsheet (Generac)