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Generac

Generac 4,500 Starting Watt Portable Gas Generator - Home Backup or RV Ready - Heavy Duty Frame - Quiet, Long Runtime, Emergency Power- 49-State Compliant

  • Based on 221 reviews
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Availability: Only 1 left in stock, order soon!
Fulfilled by A&M Industrial Inc.
Arrives Thursday, Mar 19
Order within 21 hours and 33 minutes
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Style: 4,500 Watts


Features

  • Powerful Portable Performance: With Generacs PowerRush Advanced Technology, the 7721 GP3600 generator delivers 40% more starting capacity, handling heavy electrical loads with ease. Ideal for emergency power, recreation, and home use
  • Smart Protection - Stay safe with the integrated COsense technology. This smart generator can detect and alert you of hazardous carbon monoxide levels during operation, ensuring your safety at home or on the go.
  • Extended Runtime: The GP3600 boasts a long-lasting OHV engine and a large-capacity steel fuel tank with a built-in fuel gauge, ensuring you have power when you need it most
  • Built for Durability: Designed to thrive in rough environments, this generator features covered outlets for added protection, a rugged 1.25-inch steel-tube cradle for strength, and heavy-duty, never-flat wheels for easy transportation
  • Maintenance Made Easy: Keep your generator in top shape with the hour meter that tracks maintenance intervals. Plus, the low-oil level shutdown feature automatically safeguards the engine from damage, ensuring a long and reliable lifespan

Description

The 3600-watt Generac GP3600 portable generator can be used to tackle home projects, provide power for tools, or deliver essential electricity in the case of an outage. It is an especially affordable solution with premium features. These include PowerRush™ Advanced Technology — delivering over 40% more starting capacity —an OHV engine for longer engine life and a large- capacity steel fuel tank with an incorporated fuel gauge for durability. The hardened steel tube cradle provides added strength, while the low-oil level shutdown protects your engine from damage. Heavy-duty, never-flat wheels and a foldable handle make for easy transportation of the generator. The compact size of the GP3600 ensures it will take up minimal storage space in the garage.

Brand: Generac


Wattage: 3600 watts


Fuel Type: Gasoline


Power Source: gas_powered


Recommended Uses For Product: Commercial


Item Weight: 105 Pounds


Voltage: 120 Volts


Output Wattage: 3600


Special Feature: CO Sensor, Heavy Duty, Portable


Included Components: Generac 7721 GP3600 3,600-Watt Gas-Powered Portable Generator - COsense Technology - Powerrush Advanced Technology - Reliable Power for Emergencies and Recreation - 49 State Compliant See more


Brand: Generac


Wattage: 3600 watts


Fuel Type: Gasoline


Power Source: gas_powered


Recommended Uses For Product: Commercial


Item Weight: 105 Pounds


Voltage: 120 Volts


Output Wattage: 3600


Special Feature: CO Sensor, Heavy Duty, Portable


Included Components: Generac 7721 GP3600 3,600-Watt Gas-Powered Portable Generator - COsense Technology - Powerrush Advanced Technology - Reliable Power for Emergencies and Recreation - 49 State Compliant


Color: Orange/Black


Product Dimensions: 24"L x 22.5"W x 21"H


Material: Plastic


Model Name: GP3600


Engine Type: 4 Stroke


Ignition System Type: Magneto


Tank Volume: 4.7 Gallons


Engine Displacement: 208 Cubic Centimeters


Total Power Outlets: 3


Starting Wattage: 5040 Watts


Running Wattage: 3600 Watts


UPC: 696471086270


Manufacturer: Generac


Item Weight: 105 pounds


Department: Unisex-Adult


Item model number: 7721


Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Mar 19

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

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Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

    • Great Value for the Money
Style: 9,400 Watts
I'm in the process of phasing out a 10 year old portable gas generator with this Generac dual fuel version. My new Generac arrived nicely packaged. Assembly was fairly easy. Now I'm into the 30 hour engine break in phase. Today I did the Initial Engine Run with No Load. I like the fact that intuitive instructions are visible on the generator frame for Manual or Electric Starts. I'm breaking in the engine using gasoline and I followed the routine for Electric Starts. After adding the break in engine oil and gasoline, the engine fired up with one push of the button. [BTW-I really like the Fuel Gauge since my old generator doesn't have one.] It ran smooth and powerful for the entire one hour initial start up period. And it's quieter than my old generator. The controls for Selection of Fuel [Gas or Propane], the Choke, Fuel On/Off Switch are well marked and responsive. While it was running I tried the connections for the 120 Volt AC 20-Amp GFCI Duplex Receptacle and the 120/240 Volt AC, 30 Amp Locking Receptacle, with extension cords. No problems here. It was also easy to attach the LP regulator connecting hose to the valve on an empty 20 lb. LP cylinder, and also attach the opposite end of the hose to the generator. No problems here. When the Hour Meter registered "1" I shut the generator down. I will complete the remaining 29 hours of the engine break in period with variable limited loads in the coming days. After the break in period, I will replace the engine oil with a synthetic oil per the Owner's Manual. My impression to this point is that I got great value for the money invested. And when I switch out my old generator from the Manual Transfer Switch, in my house, I believe my Generac 9,400 Starting Watt Dual Fuel Portable Generator will power my home, when needed, for many years to come. [I will provide updates to this review in the coming days as I progress to the end of the break in period for my new generator.] ... show more
Reviewed in the United States on February 28, 2026 by TWD
    • Efficient and Dependable Generator
Style: 10,000 Watts
Review Image by Marlon Smalling Marlon Smalling
Great value and easy to use This generator arrived well-packaged and was easy to set up right out of the box. It starts reliably and provides steady power for my basic needs. The noise level is reasonable for its size, and it feels solidly built. Overall, it does exactly what I expected and is a good value for the price. ... show more
Reviewed in the United States on December 13, 2025 by Marlon Smalling Marlon Smalling
    • Perfect product
Style: 4,500 Watts
Great generator. Extremely easy to crank. Price was good and delivery was fast. Perfect for most applications.
Reviewed in the United States on February 15, 2026 by Avalon T.
    • Generac is unreliable
Style: 10,000 Watts
I have had this generator (10000/8500W) generator for about 4 months. Followed all the directions for setting it up, all of the directions getting it started and running including shutdown. Did a break in of the motor per the manual. First major storm of the season the generator would start up and run for a few minutes and would then shutdown. Tried it about 5 or 6 times and had the same thing happen. Checked to see if the carbon monoxide sensor was shutting down but it wasn’t. Tank was full of fuel, the right amount of oil. Checked to make sure I hadn’t done something wrong by reading the manual but everything should have been okay. Gave up and got out my 20 year old Onan generator that I wasn’t nearly as fastidious with and it started up and ran fine. Terrible waste of waste of money buying this Generac generator. When the Generac did run it would load up even when switching on a few lights, I couldn’t believe it. The Onan generator was roughly half the capacity and I never had any issues like that.. ... show more
Reviewed in the United States on December 19, 2025 by dps
    • Starts right up. Great quality
Style: 10,000 Watts
Wonderful purchase. Was very skeptical purchasing online but the price was very good. My husband said it is worth every penny. Generac is a reputable brand. It fires up quickly and never has a problem. Highly recommend.
Reviewed in the United States on January 8, 2026 by toboop75
    • Portable gas generator for home backup
Style: 4,500 Watts
Using the Generac 4,500 Starting Watt Portable Gas Generator has been a lifesaver during unexpected power outages. Its heavy-duty frame makes it reliable for both home backup and RV use. The long runtime and quiet operation are incredibly beneficial, ensuring uninterrupted power supply without causing disturbances. Its 49-State Compliance gives added peace of mind. I noticed the sturdy build as soon as the delivery arrived; the box sat prominently on the dining table until I had it up and running. The convenience and assurance it provides during emergencies make it a valuable addition to any household. ... show more
Reviewed in the United States on January 7, 2026 by Justin
    • A better piece of equipment
Style: 9,400 Watts
This is a much better piece of equipment than the ‘mass import’ companies offer. Smoother operation with negligible metal to metal noise. Much tighter operation. Just a better piece of equipment
Reviewed in the United States on December 26, 2025 by Bob W
    • Generator
Style: 10,000 Watts
Love it. Very durable.
Reviewed in the United States on March 1, 2026 by Troy

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