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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 V, 240 V and 120 V, 3-phase, 60 Hz and rated 2776 A. It holds about 100 L (26.4 gal) of oil and 61 L (16.1 gal) of coolant, with a maximum ambient rating of 40 °C. Starting uses 2 group-8 batteries at 24 V. The set measures 4369×2083×2362 mm (172.0×82.0×93.0 in) and weighs about 8501 kg (18741 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 →

Typical fuel consumption for 800–805 kW Diesel generators →

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Service parts for the MD800

Grouped by system, with how many of each the parts manual calls for.

Oil system

1 required

Prices captured from merchant listings; some links are affiliate links. Confirm against your serial number before ordering.

Specifications

FuelDiesel
Frequency60.0 Hz
Standby power800 kW
Standby kVA1000
Prime power720 kW
EmissionsTier 2
ControllerInterliGen NT Display
Oil capacity100.0 L
Alternator800kW, 125°C, NEMA H
Voltage options277 V, 240 V, 120 V
Phase3
Rated current2776 A
Power factor0.8
Battery group8D
Battery voltage24 V
Battery quantity2
Coolant capacity61 L
Max ambient40 °C
Dimensions (L×W×H)4369×2083×2362 mm
Dry weight8501 kg

Engine

Mitsubishi S12A2-Y2PTAW-2
Oil capacity26.4 L
Coolant capacity26.4 L
Displacement33.93 L
AspirationTurbo-charged, InterCooler
Rated speed1800 rpm

Same engine, other brands

4 brands

The Mitsubishi S12A2-Y2PTAW-2 in this set also powers 5 generator sets sold under 4 other brands. Service parts and maintenance intervals for the engine are shared; enclosure, alternator, controller and ratings are not.

BrandModels
Kohler750REOZM, 800REOZM
AKSAAPD-ULM800
Rudox Power GenerationERM800
Simson-MaxwellSMW800 T6-T2

Maintenance & consumables

for the Mitsubishi S12A2-Y2PTAW-2
ItemSpecCapacityPart #Interval
Air filterDry—2000 hr
Fuel filterCartridge×3—2000 hr
Oil filter515.6 hrs, 3/7/24×3GM32057 Amazon eBay $9.99
BatteryDual, 24×2—2000 hr
BeltLevel 1 Fan and Belt Guards—2000 hr
Coolant303.0 L—
Coolant filterClean Element—2000 hr
Oil120.0 L—
Spark plugBosch P Type x 2—2000 hr

Common questions

What is the power rating of the Generac MD800?

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

What engine is in the Generac MD800?

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

Is the Generac MD800 diesel or gas?

The Generac MD800 runs on Diesel.

How much oil does the Generac MD800 take?

The Mitsubishi S12A2-Y2PTAW-2 engine in the Generac MD800 has an oil capacity of 26.4 liters.

What is the cooling system capacity of the Generac MD800?

The Generac MD800 cooling system holds 61 liters (16.1 US gallons) for the radiator system including the engine, per the manufacturer specification sheet.

What is the prime power rating of the Generac MD800?

The Generac MD800 is rated 720 kW prime (900 kVA), against 800 kW standby.

How much does the Generac MD800 weigh?

The Generac MD800 has a dry weight of 8501 kg (18741 lb).

What voltages is the Generac MD800 available in?

The Generac MD800 is offered in 277 V, 240 V, 120 V, 3-phase.

How many cold cranking amps does the Generac MD800 require?

The Generac MD800 uses 2 batteryies, 24 V each, group 8D, per the manufacturer specification sheet.

Which alternator is fitted to the Generac MD800?

The Generac MD800 uses a 800kW, 125°C, NEMA H alternator.

Which oil filter part number does the Generac MD800 take?

The Generac MD800 uses oil filter part number GM32057.

Parts

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

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%560.219.3
Standby50%121.932.2
Standby75%177.146.8
Standby100%246.865.2

Available documents

Spec sheet — md800-0l1426a (Generac)

This page was generated from the 1 manufacturer document above by automated extraction; every figure shown is copied from one of them. How the data is compiled.

Full service, cheapest listings

Priced items from this model's own parts manual.

Oil filter GM32057$9.99
1 priced item$9.99