Portable Generator, 18000 | EFI | Electric Start with COsense | 50ST
From emergency home backup to DIY projects to the jobsite, the Generac GP18000EFI portable generator provides high wattage, dependable portable power. Equipped with an 816cc engine with Electronic Fuel Injection, the GP18000EFI delivers power efficiently, providing up to 9 hours of runtime at 50% load. TruePower™ Technology safely powers sensitive electronics, appliances and tools while onboard COsense® Technology provides powerful protection against hazardous carbon monoxide. The GP18000EFI also features electric start (battery included), low-oil shutdown protection, circuit breaker protected outlets and an hour meter with maintenance resets. The included never-flat wheel kit and available lifting eye accessory make transportation easy around the home or jobsite.
Featuring COsense® Technology: STOPS. ALERTS. SAVES. Powerful protection against hazardous carbon monoxide.
Generac 816cc EFI Engine – Delivers the right amount of power to get the best performance and efficiency out of your engine
TruePower™ Technology – With less than 5% THD, safely powers sensitive electronics and tools
Low-Oil Pressure Shutdown – Automatically safeguards engine from damage
Large Capacity Fuel Tank – With incorporated fuel gauge, provides durability and extended run times
Hardened 1 ¼” Steel Tube Cradle – For added strength and durability
Hour Meter – Tracks maintenance intervals
Heavy-Duty, Never-Flat Wheels – For reliable portability
Electric Start – Battery Included – Provides hassle-free start-up
Pairs well with
In stock! Ships within 1-2 business days.
90-day risk-free trial
2-Year Warranty
Complimentary shipping & returns
Portable Generator, 18000 | EFI | Electric Start with COsense | 50ST
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Home Energy, Reimagined
From Standby Generators that power your home during outages, to Portable Solutions built for flexibility, to Smart Batteries like Tesla and Lion Energy, and Accessories that complete your setup — our collections bring you energy independence, reliability, and innovation.
FAQs
Please read our FAQs page to find out more.
What’s the difference between a standby generator and a portable generator?
A standby generator is permanently installed outside your home and automatically powers your entire house during an outage. Portable generators are smaller, movable, and best for running essentials or outdoor needs.
How do I choose the right generator size?
Start by calculating the wattage of the appliances you want powered. Smaller homes may need 10–14 kW, while larger homes often require 18–26 kW or higher. Portable units range from 2,500–18,000 watts.
Do generators need professional installation?
Standby generators require professional installation with a transfer switch for safety and compliance. Portable generators typically do not — they can be set up manually with extension cords or an inlet box.
What fuel options are available?
Most standby generators run on natural gas or liquid propane. Portable units are available in gasoline, dual-fuel (gas/LP), tri-fuel (gas/LP/natural gas), and diesel.
Do Generac generators come with warranties?
Yes — Generac offers a 5-year limited warranty on residential standby models, with extended options available. Portable models also include manufacturer warranties.
How do I choose the right generator size?
Start by calculating the wattage of the appliances you want powered. Smaller homes may need 10–14 kW, while larger homes often require 18–26 kW or higher. Portable units range from 2,500–18,000 watts.
What’s the benefit of a home battery system?
Home batteries store solar or grid power for backup use, reduce reliance on the grid, and can help lower energy bills by shifting usage to off-peak times.
Can Mango Power and Lion Energy batteries power my whole home?
Yes. Mango Power systems offer whole-home backup with modular expansion. Lion Energy’s batteries are stackable, making them ideal for growing energy needs.
Do batteries work without solar?
Yes. While batteries integrate perfectly with solar, they can also charge directly from the grid to provide backup during outages.
What warranties do home batteries include?
Tesla, Mango Power, and Lion Energy all offer 10-year limited warranties, ensuring long-term performance.