Generac

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Generac SG040

40 kW standby · Natural Gas · Liquid-cooled

40 kW natural gas generator. Commercial and industrial power generation.

Standby power
40 kW
Voltage options
277/480V
Frequency / Phase
60 Hz · 3-phase
Engine
Generac 4.5L SI
commercial-standby

Overview#

The Generac SG040 is a 40 kW natural gas generator designed for commercial and industrial standby power applications.

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Get pricing & lead time on the Generac SG040

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 SG040

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

Estimate runtime on this tank

Fuel demand at 75% load

420,000 BTU/hr420.0 cf/min @ 1,000 BTU/cf

On utility natural gas the runtime is generally unlimited provided the supply line and meter can deliver this BTU/hr at the engine's required inlet pressure (typically 5–14" WC residential, up to 5 psi commercial). Confirm against the OEM's published fuel-pressure spec.

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Need service or parts for the Generac SG040?

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