HomeGeneracGenerac MD1000

Generac MD1000 Generator Set

The Generac MD1000 is a 1000 kW (1250 kVA) Diesel standby generator set powered by a Mitsubishi S12H-Y2PTAW-1 engine. It is available at 277/480 V and 346/600 V, 3-phase, 60 Hz and rated 1504 A. It holds about 180 L (47.6 gal) of oil and 289 L (76.3 gal) of coolant, with a maximum ambient rating of 50 °C. Starting uses 4 group-4 batteries at 12 V. The set measures 2500×1625×1625 mm (98.4×64.0×64.0 in), weighs about 10586 kg (23338 lb) and produces 70 dBA at 1 m. An integrated tank holds 950 L (251.0 gal), roughly 12 hours of runtime. The same S12H-Y2PTAW-1 engine also powers generator sets from Kohler, Rudox Power Generation and Simson-Maxwell.

1000 kW
Standby
2265.0 L
Displacement
180.0 L
Oil capacity
3
Document types

How to read your Generac serial & model number →

Typical fuel consumption for 1000–1005 kW Diesel generators →

Compare with other 1000–1005 kW Diesel generators →

Service parts for the MD1000

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

Fuel system

1 required
0161970SBYFuel filtersee priceAmazon

Oil system

1 required
0161970SBYOil filtersee priceAmazon

Belts

1 required
0161970SBYBeltsee priceAmazon

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

Specifications

FuelDiesel
Frequency60.0 Hz
Standby power1000 kW
Standby kVA1250
Prime power900 kW
EmissionsTier 2
ControllerInteliGen NT
Oil capacity180.0 L
AlternatorK1000064N22 K1000064N22 (4-pole, Class H insulation)
Voltage options277/480 V, 346/600 V
PhaseThree-Phase
Rated current1504 A
Power factor0.8
Circuit breaker1504 A
Battery group4
Battery voltage12 V
Battery quantity4
Coolant capacity289 L
Max ambient50 °C
Dimensions (L×W×H)2500×1625×1625 mm
Dry weight10586 kg
Sound level70.0 dBA @ 1 m
Fuel tank950.0 L
Tank runtime12 hr

Engine

Mitsubishi S12H-Y2PTAW-1
Oil capacity200.0 L
Coolant capacity401.0 L
Displacement2265.0 L
AspirationTurbocharged, Intercooled
Rated speed1800 rpm

Maintenance & consumables

for the Mitsubishi S12H-Y2PTAW-1
ItemSpecCapacityPart #Interval
Air filterDry
Fuel filterFuel Filter0161970SBY Amazon eBay
Oil filterOil Filter0161970SBY Amazon eBay
Battery8D×2200 hr
BeltBelt0161970SBY Amazon eBay
CoolantDemineralized water or distilled water, 40-60% anti-freeze based on a theoretical temperature that is 9-18°F (5-10°C) below the lowest temperature expected in the area76.3200 hr
Coolant filterUV/Ozone resistant hoses12 hr
Oil200.0 L200 hr
Spark plugN/A200 hr

Common questions

What size generator is the Generac MD1000?

The Generac MD1000 is rated 1000 kW standby (1250.0 kVA).

Which engine powers the Generac MD1000?

The Generac MD1000 is powered by the Mitsubishi S12H-Y2PTAW-1 engine.

Is the Generac MD1000 diesel or gas?

The Generac MD1000 runs on Diesel.

What is the oil capacity of the Generac MD1000?

The Mitsubishi S12H-Y2PTAW-1 engine in the Generac MD1000 has an oil capacity of 200.0 liters.

What alternator does the Generac MD1000 use?

The Generac MD1000 uses a K1000064N22 K1000064N22 alternator. It has 4 poles. Insulation class H.

Which oil filter part number does the Generac MD1000 take?

The Generac MD1000 uses oil filter part number 0161970SBY.

What fuel filter fits the Generac MD1000?

The Generac MD1000 uses fuel filter part number 0161970SBY.

Parts

16
Part #DescriptionQtySystem
0161970SBYBattery1Battery Amazon eBay
01865Fuel/Water Filtering SystemFuel filter Amazon eBay
18650Oil filter Amazon eBay $24.69
01858Engine Oil RecommendationsService part / kit Amazon eBay
01859Serial Number LocationsService part / kit Amazon eBay
01860GFCI Receptacle and Interior Light TimerService part / kit Amazon eBay
01861Component Locations - Left SideService part / kit Amazon eBay
01862Component Locations - Right SideService part / kit Amazon eBay
01863Control PanelService part / kit Amazon eBay
01864Digital ControllerService part / kit Amazon eBay
01866Parallel Setup and OperationService part / kit Amazon eBay
01867Generator Output ConnectionsService part / kit Amazon eBay
01868Voltage RegulatorService part / kit Amazon eBay
01870A299X- 68-03 fos! 104 F1035-12045 25-01 | 29 5 | F1805-10020 68-01 fo5 19Service part / kit Amazon eBay
01871Maintenance schedule and basic maintenance tasks for MCG1000MT2Service part / kit Amazon eBay
01873Maintenance schedule and extended maintenance tasks for MCG1000MT2Service 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%90.023.8
Standby50%166.044.0
Standby75%250.066.0
Standby100%314.082.9

Available documents

Spec sheet — md1000-0l1428a (Generac)Reference — COUNTY-JAIL (Generac)Parts manual — 0173810sby-md1000 (Generac)Parts manual — Generac 1000kW MD1000 Diesel Generator 37.1L (Generac)