40kW Generac Protector Series Liquid Cooled Standby Generator
Product Overview
Series: Protector XG
Key Features & Benefits
- The Generac Protector Series 40kW Liquid-Cooled Standby Generator is designed to provide dependable backup power for large homes and commercial properties.
- With a 40,000-watt output, it can support major appliances, heating and cooling systems, lighting, and other essential electrical equipment when utility power is interrupted.
- Its automatic standby operation helps restore power without requiring manual startup.
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Powered by a 4.5-liter, four-cylinder engine, this generator runs on natural gas or liquid propane.
- Its liquid-cooling system helps manage engine temperature during extended operation, while the sound-attenuated enclosure helps reduce operating noise.
Detailed Product Description
The Generac Protector Series 40kW Liquid-Cooled Standby Generator is designed to provide dependable backup power for large homes and commercial properties. With a 40,000-watt output, it can support major appliances, heating and cooling systems, lighting, and other essential electrical equipment when utility power is interrupted.
Its automatic standby operation helps restore power without requiring manual startup.
Powered by a 4.5-liter, four-cylinder engine, this generator runs on natural gas or liquid propane. Its liquid-cooling system helps manage engine temperature during extended operation, while the sound-attenuated enclosure helps reduce operating noise.
The aluminum enclosure is designed to resist corrosion and withstand outdoor installation conditions.
The generator features TruePower™ technology, providing less than 5% total harmonic distortion for cleaner power suitable for sensitive electronics and modern appliances. Its automatic operation, high motor-starting capability, and cellular connectivity make it a practical solution for dependable backup power.
Mobile Link® monitoring allows users to check generator status and maintenance alerts remotely through a compatible device.
Specifications
Brand: Generac
Series: Protector XG
Model: XG04045
Generator Type: Automatic Standby Generator
Rated Output: 40,000 watts (40 kW)
Cooling System: Liquid-Cooled
Engine: 4.5L Four-Cylinder
Engine Speed: 1,800 RPM
Fuel Type: Natural Gas or Liquid Propane
Voltage: Model-dependent; 120/240V single-phase or configurable three-phase versions are available
Enclosure: Corrosion-Resistant Aluminum
Voltage Regulation: Digital, ±1%
Total Harmonic Distortion: Less than 5%
Monitoring: Mobile Link® Cellular Connectivity
Exercise Mode: Quiet-Test™
Weight: Approximately 1,781 lbs.
Dimensions: Approximately 83.4 x 33.6 x 45.2 inches (L x W x H), depending on model configuration
Warranty: 5 Year
Technical Specifications
| Model | XG04045 |
|---|---|
| Power | 40kW |
Backup Power & Applications
Suitable for the power applications specified by the manufacturer. Electrical installation, connection and generator sizing should follow the product manual and applicable codes.
What’s Included
- Generator unit
Refer to the product packaging or manufacturer documentation for the exact accessories, hardware and supplied components.
Care & Maintenance
Inspect the unit and service according to its operator manual. Follow electrical safety and ventilation requirements; never operate engine-driven generators indoors.
Warranty Information
Warranty coverage and exclusions are governed by the applicable written manufacturer and seller warranty terms provided with the product.

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