Generac 8917 GP18000EFI 18000W Electric Start Portable Generator w/COsense (CARB Compliant) Features:
Generac GP18000EFI (Model 8917) – 18,000W Electric Start Portable Generator
The Generac GP18000EFI (Model 8917) is the most powerful portable generator in Generac’s lineup — engineered to deliver industrial-strength performance for home backup, jobsite, and commercial applications. With 18,000 running watts and a staggering 22,500 starting watts, this generator can power everything from large HVAC systems to multiple jobsite tools at once, all while maintaining stable, efficient operation.
At its core is an 816cc Generac OHVI engine with Electronic Fuel Injection (EFI), ensuring reliable starts in any weather and optimized fuel use under varying loads. Paired with True Power™ Technology, the GP18000EFI produces clean, consistent electricity with less than 5% total harmonic distortion (THD) — safe for sensitive electronics, heavy-duty motors, and everything in between. The Automatic Voltage Regulation (AVR) system further stabilizes output while improving equipment longevity.
Built for endurance, the GP18000EFI includes a massive 14.2-gallon steel fuel tank, providing up to 9 hours of runtime at 50% load. The rugged 1¼-inch steel-tube cradle, 12-inch never-flat wheels, and folding, locking handle make transport manageable despite its commanding power. For safety, COsense® Technology detects dangerous carbon-monoxide levels and automatically shuts down the engine, protecting users in enclosed or partially ventilated areas.
Every detail is crafted for heavy-duty use — from the low-oil pressure shutdown system to the integrated fuel gauge, hour meter, and electric start with included battery. Whether you’re powering a construction site, farm, or an entire home during an outage, the GP18000EFI delivers unmatched performance, durability, and peace of mind.
Key Features
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18,000 running watts / 22,500 starting watts
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816cc Generac OHVI engine with EFI – powerful, fuel-efficient, and reliable
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True Power™ Technology – <5% THD for clean, stable power
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Automatic Voltage Regulation (AVR) for steady output under load
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COsense® Technology – detects and shuts down for unsafe CO levels
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Electric start with battery included and recoil backup
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14.2-gallon steel fuel tank = up to 9 hr runtime @ 50% load
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Low-oil pressure shutdown for engine protection
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Outlets:
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(2) 120V 20A 5-20R Duplex
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(1) 120V 30A L5-30R
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(1) 120/240V 30A L14-30R
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(1) 120/240V 50A 14-50R
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Heavy-duty 1¼″ steel cradle and 12″ never-flat wheels for easy transport
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Built-in hour meter and fuel gauge for maintenance tracking
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Dimensions: 58.5″ L × 30.9″ W × 36.5″ H | Weight: 443 lbs
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Warranty: 3-Year Residential | 2-Year Commercial
