Overview#
The Generac SD400 is a 400 kW diesel generator designed for commercial and industrial standby power applications.
Generac
NewGenerac SD400
400 kW standby · Diesel · Liquid-cooled
400 kW diesel generator. Commercial and industrial power generation.
Generac SD400
Photo coming soon
- Standby power
- 400 kW
- Voltage options
- 277/480V
- Frequency / Phase
- 60 Hz · 3-phase
- Engine
- Perkins 12.5L
commercial-standby
Request a quote
Get pricing & lead time on the Generac SD400
Tell us about the application — kW, voltage, application, install timeline — and we'll respond within one business day with budgetary pricing, lead time, and any sizing notes.
Estimate runtime for the Generac SD400
Adjust load percent and tank size to estimate runtime. Pre-filled with this model's spec where available.
Estimate runtime on this tank
Estimated runtime
9.3 hours(0.4 days)
Fuel consumption ≈ 21.60 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.
Similar models
Generac
NewGenerac SD300
300 kW standby · Diesel · Liquid-cooled
300 kW diesel generator. Commercial and industrial power generation.
3-phasecommercial-standby
Need service or parts for the Generac SD400?
We service every major OEM and stock genuine parts for the most common models.