40kW Generac Protector Series Liquid Cooled Standby Generator

$5,130.00 $13,580.00 Save $8,450.00

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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

Shipping is free on every order within the United States (U.S. addresses only). Orders are processed within 1–2 business days and delivered in 3–7 business days after that. Orders placed before 5:00 PM EST on a business day start processing the same day. Larger items may ship by freight, and the carrier will contact you to schedule delivery. You’ll receive a tracking link by email as soon as your order ships. Read the full shipping policy.

Not the right fit? Contact us within 30 days of delivery and we’ll send you a free prepaid return label. Returns are accepted for new, unused items in their original condition and packaging. Equipment that has been fueled, charged and run, or used to cut grass, can’t be returned. Once your return arrives, we process your refund within 14 days to your original payment method. Read the full return policy.

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40kW Generac Protector Series Liquid Cooled Standby Generator

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