Generac GP18000EFI 18000-Watt Portable Generator

Product Overview

The Generac GP18000EFI Portable Generator (Model 8917) is an ultra-high-capacity, commercial-grade mobile power plant engineered to deliver massive electrical output for full-home emergency backup, extensive DIY applications, and heavy-duty industrial job sites. Driven by a massive 816cc overhead valve (OHV) engine, this generator utilizes advanced Electronic Fuel Injection (EFI). The EFI system monitors environmental conditions and load requirements in real time to optimize fuel-to-air ratios, ensuring immediate starting response, lower emissions, and maximum fuel efficiency across varying outdoor temperatures.

The GP18000EFI produces 18,000 running watts of continuous power, making it an exceptionally viable, cost-effective alternative to a permanently installed home standby generator when paired with a compatible manual transfer switch. Constructed within a hardened 1.25-inch steel tube cradle, this robust system integrates TruePower™ Technology to ensure the electrical current remains ultra-clean and stable under extreme stress. It comes equipped with an electric start ignition, an onboard starter battery, and a never-flat wheel kit to facilitate mobility.

Key Features & Benefits

• Electronic Fuel Injection (EFI) Engine: The 816cc power plant dynamically adjusts fuel delivery to maximize performance, eliminating the starting issues and manual choking associated with traditional carburetors while yielding up to 9 hours of continuous runtime at a 50% load.

• TruePower™ Electrical Regulation: Keeps total harmonic distortion (THD) below 5%, delivering clean, utility-grade sine wave power that safely operates voltage-sensitive computers, modern household appliances, and variable-speed tools.

• COsense® Carbon Monoxide Defense: Outfitted with an atmospheric monitoring sensor that detects toxic carbon monoxide gas buildup, instantly triggering an automatic engine shutdown and visual alert to protect occupants.

• HomeLink™ Manual Transfer Compatibility: Engineered with high-amperage output configurations to integrate seamlessly with manual transfer switches, providing enough capacity to energize a home's entire electrical breaker network during major grid failures.

• Automated Low-Oil Pressure Shutdown: A built-in pressure switch monitors crankcase lubrication, automatically cutting engine ignition if oil pressure falls below safe parameters to prevent critical mechanical damage.

• Comprehensive Diagnostic Panel: Features circuit-breaker protected outlets to isolate electrical overloads, alongside an integrated digital hour meter that tracks running duration to simplify scheduled preventative maintenance.

Technical Specifications

Engine & Efficiency Parameters

Electrical Performance & Controls

Physical Properties & Architecture

Safety & Installation Requirements

Grid Isolation Requirement: To safely power a residential property, this generator must be connected via an approved manual transfer switch. Direct connection to home wiring without an isolation switch is illegal in many jurisdictions and creates a fatal backfeeding hazard for local utility line workers.

What's Included: Generac GP18000EFI 18,000W Portable Generator, 12V Onboard Lead-Acid Starter Battery, Heavy-Duty Never-Flat Wheel and Axle Assembly, Integrated Transport Handle, Engine Oil, and a Comprehensive Technical Operator and Maintenance Manual.

• We currently ship within the United States only.
• Enjoy free standard shipping on all orders.
• Orders are processed within 1–2 business days.
• Estimated Total Delivery Time is 4–7 business days.
• Tracking information will be sent to your email within 24 hours after your order has been dispatched.
• For more information about our shipping process, please view our full Shipping Policy.

• Not Satisfy with your product? Return or exchange within 30 days.
• Items must be unused and in original condition.
• Damaged products are eligible for a refund or replacement.Your line works well.
• For more information about our return & refund process, please view our full Return & Refund Policy.