Generac

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Generac SD1250

1250 kW standby · Diesel · Liquid-cooled

1250 kW diesel generator. Commercial and industrial power generation.

Standby power
1250 kW
Voltage options
277/480V
Frequency / Phase
60 Hz · 3-phase
Engine
Perkins 46.0L V12
commercial-standby

Overview#

The Generac SD1250 is a 1250 kW diesel generator designed for commercial and industrial standby power applications.

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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.

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

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Estimated runtime

3.0 hours(0.1 days)

Fuel consumption ≈ 67.50 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.

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