Generac
Generac SG040
Industrial Gaseous
Generac SG040 uses the 4.43 L inline-four gaseous engine at 1800 RPM. The official natural-gas specification publishes 40 kWe standby, 36 kWe prime and 61 hp at standby output. The generator set is EPA certified for stationary service.
- Standby Power · 60 Hz
- 50 kVA
- Electrical Output
- 40 kWe
- Cylinders
- L4
- Displacement
- 4.43 L
- Rated Speed
- 1,800 RPM
Power Ratings
kWm = mechanical shaft power · kWe = electrical output · kVA = kWe ÷ 0.8 pf
60 Hz1800 RPM
| kWm | kWe | kVA | |
|---|---|---|---|
| Prime Power | 41.8 | 36 | 45 |
| Standby Power | 45.5 | 40 | 50 |
Generac SG040 generator set context
The Generac SG040 is listed here as a natural gas generator-drive engine for 60 Hz generator sets, with a headline 50 kVA / 40 kWe / standby rating. Use this page to compare the published engine output, electrical kWe/kVA ratings, emissions level, datasheet availability, and neighboring models before specifying an alternator, controller, enclosure, voltage, and compliance package.
Also searched as
Technical Specifications
| Brand | Generac |
| Model | SG040 |
| Series | Industrial Gaseous |
| Configuration | Inline-4 Naturally Aspirated |
| Cylinders | 4 |
| Displacement | 4.43 L |
| Fuel Type | Natural Gas |
| Ignition Type | Spark Ignition |
| Cooling Method | Liquid-Cooled |
| Emissions Standard | U.S. EPA Stationary |
| Certifications | U.S. EPA Stationary, U.S. EPA Stationary Emergency |
| Country of Origin | United States |
Frequently asked questions
What is the power output of the Generac SG040?
The Generac SG040 is rated at 50 kVA standby / 45 kVA prime at 60 Hz (1,800 rpm).
Does the SG040 run at 50 Hz or 60 Hz?
The Generac SG040 is rated for 60 Hz (1,800 rpm).
What fuel does the Generac SG040 use?
The Generac SG040 is a Natural Gas generator-set engine.
What is the displacement and cylinder configuration of the SG040?
The Generac SG040 is an inline-4 (4-cylinder) engine with a displacement of 4.43 L.
What emissions standard does the SG040 meet?
The Generac SG040 is certified to U.S. EPA Stationary emissions standards.
Is the Generac SG040 still in production?
Yes — the Generac SG040 is a current production model.
Is a datasheet available for the SG040?
Yes — an official Generac datasheet for the Generac SG040 can be downloaded from this page.
Related Engines
Compare Generac SG040
Reference
- Canonical page
- /engines/generac-sg040-4-5l
- Last database update
- 2026-07-26
- Manufacturer files
- 1 datasheet linked
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