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4.6 out of 5 stars. 1708 reviews

Generac 10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State

4.61708 Reviews

Item # 228690099

Image showing  10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State
Image showing  10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State
Image showing  10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State
Image showing  10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State
Image showing  10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State
Image showing  10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State
Image showing  10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State
Image showing  10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State
Image showing  10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State
Image showing  10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State
Image showing  10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State
Image showing  10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State
$1,499.99
or
or
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$63/mo.†  suggested payments with 24 Months Financing or earn $74 in Rewards+ on this purchase.
Valid 2/9/2026 - 2/22/2026
Apply now
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Powersport plans are not available in CA & MD.
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Generac 10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State

4.61708 Reviews

Item # 228690099

Image showing  10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State
Image showing  10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State
Image showing  10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State
Image showing  10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State
Image showing  10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State
Image showing  10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State
Image showing  10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State
Image showing  10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State
Image showing  10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State
Image showing  10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State
Image showing  10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State
Image showing  10,000/8,500-Watt Gasoline Powered XT8500EfI-OL Portable Generator, 459cc, Co 2.5 EPA/50-State
$1499.99
or
or
financeCard Logo
$63/mo.†  suggested payments with 24 Months Financing or earn $74 in Rewards+ on this purchase.
Valid 2/9/2026 - 2/22/2026
Apply now

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Powersport plans are not available in CA & MD.
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Enjoy top-notch results with this portable generator. The Generac XT8500EFI uses Electronic Fuel Injection to eliminate issues caused by bad fuel and pesky gum-ups when the unit is in storage. Whether you're enjoying the great outdoors or simply seeking a backup plan when utility power is lost in your local area, the XT8500EFI can provide the power on which you've come to rely.

For additional information on this product, please see the Product Documents section for all downloadable user manuals, installation guides, brochures and warranty statements.

  • Generac 459cc EFI engine delivers the right amount of power to get the best performance and efficiency out of your engine
  • COsense Technology - STOPS, ALERTS, SAVES. Providing powerful protection against hazardous carbon monoxide.
  • TruePower technology provides clean, smooth operation of sensitive electronics, tools and appliances
  • Low-oil shutdown automatically safeguards engine from damage
  • Large-capacity fuel tank with incorporated fuel gauge provided durability and extended run times
  • Electric start provides easy and reliable start-up
  • Battery included; self-charging while in use
  • ControlGuard provide added protection to the control panel
  • Covered outlets provide added protection from the environment and rugged working conditions
  • Hour meter tracks maintenance intervals
  • 10 solid wheels make portability easy and efficient
  • Fold-down locking handle allows for easy storage

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Reviews

Rating Snapshot

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1342 reviews with 5 stars.
246 reviews with 4 stars.
40 reviews with 3 stars.
20 reviews with 2 stars.
60 reviews with 1 star.

Overall Rating

4.6
1406 out of 1478 (95%) reviewers recommend this product

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Summary of Reviews
AI-generated from customer reviews, which may include incentivized reviews.
The Generac portable generator offers a powerful 7500-watt output that can power essential household appliances during outages. It features an electric start for easy operation and a durable, well-bui...
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1 to 4 of 1708 Reviews
1 – 4 of 1708 Reviews
Florida
Review 1

49 state generator

11 days ago
Well built, it ran go on test run started right up. Won't know any more until I have to use it.

Yes, I recommend this product.

Originally posted on generac.com

Review 1

Solid Generator

16 days ago
My generator has worked flawlessly since I purchased it. Unfortunately I have been unable to get it to work as I had intended, which is to run my pool circulation pump during winter power outages. I have verified through multiple electrical experts that my connection from the generator to the pool equipment is correct. My next step is to adjust the Hertz output down to 60 from the 62 it is currently producing. Any direction you can provide me to make that adjustment would be sincerely appreciated.

Yes, I recommend this product.

Originally posted on generac.com

Mi
Review 1

Didn't even get a chance to use it/ it failed.

17 days ago
I bought this new generator new in the box for our deer camp. We unboxed it and added the oil and clean gasoline and started it. It was gushing gas out of the carb so we had to shut it down. When we called Menards to bring it back for an exchange they said that they don't take them back and we had to bring it to a certified repair shop that was 75 miles away from our camp. Needless to say, we didn't have a generator for deer season because the repair shop was booked. When I picked it up the owner said that the carb was full of gunk and that he couldn't even charge Generac for the repair because it was a fuel issue. how could that be possible when it was brand new out of the box? I am very disappointed that we have a generator that could be a lemon and the repair shop didn't get paid!

No, I do not recommend this product.

Originally posted on generac.com

Review 1

great generator

17 days ago
I bought this a month ago and a week later lost power for hours. started right up and was perfectly able to run most of the house

Originally posted on generac.com