What engine does the SPMI-1.5M use?

Mitsubishi S16R-Y2PTAW-1 — a 65.37L turbocharged V16 diesel (60-degree vee configuration) producing 2,346 bhp at standby. This is Mitsubishi's largest industrial diesel platform, stepping from the 12-cylinder S12H (37.1L) used in the SPMI-1M. The S16R shares the same block with the SPMI-2M at a different calibration.

Why does the SPMI-1.5M only offer 480V and 600V?

At 1,500 kW, the current draw at lower voltages (208V or 240V) would be 3,600-4,500 amps — impractical for distribution conductor sizing. The SPMI-1.5M is configured for 277/480V (2,257 amps) and 346/600V (1,806 amps) only. Medium-voltage applications may use a step-up transformer.

Is there a Level 2 enclosure option for the SPMI-1.5M?

The spec sheet lists open set only at this power class. At 240 x 102 x 135 inches (20 ft × 8.5 ft × 11.25 ft) and 34,450 lbs, the SPMI-1.5M is typically installed in dedicated generator rooms with acoustic treatment, not in a sound-attenuated enclosure. The hospital-grade silencer achieves 94 dBA at 7m on the open set.

What is the fuel consumption?

127 gal/hr at full load (1,500 kW). At 75%: 96 gal/hr. At 50%: 67.7 gal/hr. A 5,000-gallon tank at 75% load provides approximately 52 hours. For data centers requiring 48+ hours of autonomy, plan accordingly.

Gillette · SPMI Series (Industrial Diesel - Mitsubishi)

Gillette SPMI-1.5M

1500 kW standby · Diesel · Liquid-cooled

1,500 kW stationary diesel standby generator with Mitsubishi S16R V16 engine. 65.37L displacement, Stamford AVK S7L1D alternator, PMG excitation. Made in USA.

Standby power: 1500 kW
Voltage options: 277/480V, 346/600V
Frequency / Phase: 60 Hz · 3-phase
Engine: Mitsubishi S16R-Y2PTAW-1 · 65.37L
EPA / Emissions: Tier 2
Alternator: Stamford AVK S7L1DC-312

Data Centers Healthcare Manufacturing Commercial Governmentutility

Overview#

The Gillette SPMI-1.5M is a 1,500-kilowatt (1.5 MW) stationary diesel standby generator — the second-largest in Gillette's catalog. It uses Mitsubishi's S16R V16 diesel at 65.37L displacement, producing 2,346 bhp at standby. Stamford AVK S7L1DC alternator with PMG excitation, DSE 7420 MKII with UL 6200.

At 1.5 MW, this is a utility-class standby generator: large data centers requiring multi-megawatt backup, major hospital campuses, industrial plants, and campus-wide emergency power distribution. Available in 480V and 600V three-phase only.

The Mitsubishi S16R — V16 at 65 liters#

The S16R is Mitsubishi's largest industrial diesel platform, used in the SPMI-1.5M and SPMI-2M:

65.37L V16 — 3,989 cu in, 60-degree vee configuration
6.69" bore × 7.09" stroke — larger bore and stroke than the S12 series
Dual Mitsubishi PS8-type fuel injection — Mitsubishi's own fuel system (not Bosch like the S12 series)
Water-to-air aftercooling — consistent with the S12 platform
14.5:1 compression ratio — optimized for the larger displacement

At 34,450 lbs open (17.2 tons), this unit requires significant structural and logistics planning.

1.5 MW installation — a different scale#

The SPMI-1.5M operates at a different installation scale than anything in the SP, SPD, SPJD, or SPVD series:

No enclosure option — typically installed in a purpose-built generator room with acoustic treatment
480V/600V only — medium-voltage distribution via step-up transformers for campus systems
127 gal/hr fuel consumption — requires 5,000-10,000 gallon on-site storage for 48+ hour autonomy
20 ft × 8.5 ft footprint — the generator room must accommodate this plus maintenance clearances

Our service experience#

At 1.5 MW, the SPMI-1.5M is a facility-class asset requiring a dedicated operations team or a structured maintenance contract. We approach these installations with a formal maintenance plan: semi-annual full-load testing, quarterly fuel system service, monthly exercising, and continuous remote monitoring via the DSE 7420 MKII's Modbus interface. The V16's 16-cylinder fuel injection system requires meticulous fuel quality management.

Engineering specifications

Physical

Length: 240 in
Width: 102 in
Height: 135 in
Wet weight: 34,450 lb

Acoustic

Sound @ 7m, full load: 94 dBA
Enclosure: Open

Fuel system & runtime

Fuel use @ full load: 127 GPH

Photos

Documents & downloads

Spec sheets & manuals

Spec sheet (datasheet)

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Estimate runtime for the Gillette SPMI-1.5M

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

2.0 hours(0.1 days)

Fuel consumption ≈ 97.97 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 Gillette SPMI-1.5M under standby duty. Field intervals may differ based on load profile, ambient conditions, and fuel quality.

Oil & filter: Every 500 hours or 12 months
Coolant change: Every 6000 hours
Air filter: Every 1000 hours
Fuel filter: Every 500 hours
Major overhaul: ≈ 20,000 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
Turbocharger(s)	Major power loss at high output	12,000+	severe
Fuel system (dual Mitsubishi PS8)	Injector fouling, uneven cylinder output	10,000+	severe
PMG excitation system	Voltage regulation failure	20,000+	severe

Frequently Asked Questions

What engine does the SPMI-1.5M use?: Mitsubishi S16R-Y2PTAW-1 — a 65.37L turbocharged V16 diesel (60-degree vee configuration) producing 2,346 bhp at standby. This is Mitsubishi's largest industrial diesel platform, stepping from the 12-cylinder S12H (37.1L) used in the SPMI-1M. The S16R shares the same block with the SPMI-2M at a different calibration.
Why does the SPMI-1.5M only offer 480V and 600V?: At 1,500 kW, the current draw at lower voltages (208V or 240V) would be 3,600-4,500 amps — impractical for distribution conductor sizing. The SPMI-1.5M is configured for 277/480V (2,257 amps) and 346/600V (1,806 amps) only. Medium-voltage applications may use a step-up transformer.
Is there a Level 2 enclosure option for the SPMI-1.5M?: The spec sheet lists open set only at this power class. At 240 x 102 x 135 inches (20 ft × 8.5 ft × 11.25 ft) and 34,450 lbs, the SPMI-1.5M is typically installed in dedicated generator rooms with acoustic treatment, not in a sound-attenuated enclosure. The hospital-grade silencer achieves 94 dBA at 7m on the open set.
What is the fuel consumption?: 127 gal/hr at full load (1,500 kW). At 75%: 96 gal/hr. At 50%: 67.7 gal/hr. A 5,000-gallon tank at 75% load provides approximately 52 hours. For data centers requiring 48+ hours of autonomy, plan accordingly.

Compatible equipment

Engine

Mitsubishi S16R-Y2PTAW-1Engines

Controllers

DSE 7420 MkIIControllers

Transfer switches

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