Generac · SD Series (Industrial Diesel)

Generac SD100-4

100 kW standby / 90 kW prime · Diesel · Liquid-cooled

100 kW industrial diesel standby generator with EPA Tier 4 Final emissions certification. Iveco/FPT 6.7L turbocharged-aftercooled inline-6 with exhaust aftertreatment, Digital H control with NFPA 110 Level I/II.

Standby power
100 kW / 90 kW prime
Voltage options
120/208V, 120/240V, 277/480V, 346/600V
Frequency / Phase
60 Hz · 3-phase
Engine
Iveco/FPT 6.7L · 6.7L
Alternator
Generac 390
Commerciallight-industrialHealthcareGovernment
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Overview#

The Generac SD100-4 is the EPA Tier 4 Final certified variant of the SD100, a 100-kilowatt industrial diesel standby generator powered by an Iveco/FPT 6.7-liter turbocharged and aftercooled inline-six engine. Rated at 100 kW standby and 90 kW prime, the SD100-4 adds exhaust aftertreatment technology to meet Tier 4 Final emissions standards, which require significantly lower particulate matter and nitrogen oxide emissions compared to Tier 3 or emergency-only certified units.

The "-4" designation in the model name indicates Tier 4 Final (T4F) compliance. The underlying engine, alternator, and control platform are shared with the standard SD100, but the SD100-4 includes a diesel particulate filter (DPF) and diesel oxidation catalyst (DOC) in the exhaust system. This makes the SD100-4 suitable for installations in air quality non-attainment zones or projects where local permitting authorities require Tier 4 Final emissions certification regardless of duty cycle.

Generac offers the SD100-4 with the same enclosure options as the standard SD Series, from open skid through Level 2 sound-attenuated enclosures in steel or aluminum with RhinoCoat powder-coated finish. The Digital H control panel provides NFPA 110 Level I and II programmable operation, Modbus communications, and IBP/OSHPD seismic certification availability.

Our Service Experience#

The SD100-4's aftertreatment system introduces maintenance considerations not present on the standard SD100. The diesel particulate filter requires periodic regeneration -- either passive (during loaded operation) or active (initiated by the controller). Standby generators that exercise infrequently may not reach sufficient exhaust temperatures for passive regeneration, making scheduled loaded exercise cycles important to prevent DPF soot accumulation. Annual DPF inspection and cleaning should be added to the standard service schedule.

Fuel quality is especially critical on Tier 4 Final units. Ultra-low sulfur diesel (ULSD) is mandatory, and any fuel contamination or degradation accelerates aftertreatment component wear. We recommend biocide treatment and annual fuel polishing for all standby installations with extended idle periods.

Engineering specifications

Physical

Length
144 in
Width
40 in
Height
117 in
Dry weight
4,988 lb

Fuel system & runtime

Fuel use @ full load
7.3 GPH
Fuel use @ 75% load
5.9 GPH
Fuel use @ 50% load
4.2 GPH

Thermal & ventilation

Heat to coolant
269,130 BTU/hr
Exhaust flow
885 CFM
Exhaust temp
885 °F
Combustion air
6,360 CFM

Documents & downloads

Spec sheets & manuals

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Estimate runtime for the Generac SD100-4

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

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Estimated runtime

35.5 hours(1.5 days)

Fuel consumption ≈ 5.63 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 SD100-4 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.

ComponentSymptomTypical hoursSeverity
Fuel quality / degradationHard starting, filter clogging, reduced power output4,380+moderate
TurbochargerPower loss, excessive smoke under load, oil consumption15,000+moderate
Exhaust aftertreatment (DPF/DOC)Regeneration fault codes, increased backpressure, derate warning10,000+moderate
BatteryFailed to start, slow cranking8,760+minor

Frequently Asked Questions

What is the difference between the SD100-4 and the standard SD100?
The SD100-4 is the EPA Tier 4 Final certified variant of the SD100. Both use the same Iveco/FPT 6.7L inline-6 engine at 100 kW standby, but the SD100-4 adds exhaust aftertreatment (diesel particulate filter and diesel oxidation catalyst) to meet Tier 4 Final emissions standards. The standard SD100 is EPA Certified for Stationary Emergency applications only, while the SD100-4 meets stricter Tier 4 Final requirements for installations where air quality regulations demand lower particulate and NOx emissions.
What is the fuel consumption of the Generac SD100-4?
The SD100-4 shares the same 6.7L engine platform as the standard SD100. Fuel consumption at standby rating is approximately 7.3 gallons per hour at full load (100%), 5.9 gph at 75% load, and 4.2 gph at 50% load. Actual consumption may vary slightly due to the aftertreatment system's periodic regeneration cycles.
What voltages are available?
The SD100-4 is available in three-phase configurations: 120/208 VAC, 120/240 VAC, 277/480 VAC, and 346/600 VAC, all at 0.8 power factor.

Compatible equipment

Transfer switches

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