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Generac 5791, 800 Running Watts/850 Starting Watts, Gas Powered Portable Inverter

by Generac
3.6 out of 5 stars 71 customer reviews
| 3 answered questions

Price: $319.00 & FREE Shipping. Details
Only 7 left in stock (more on the way).
Ships from and sold by Amazon.com.
800 Watt
  • Enter your model number above to make sure this fits.
  • Up to 40% lighter than a standard generator of equal watts
  • FlexPower to save fuel, reduce noise and safely power sensitive electronics
  • Low oil shutdown protection prevents engine from damage
  • LED indicator lights on the control panel indicate system status
  • Electronic circuit breakers protect against overloads
10 new from $319.00
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Portable Generators. Standby Generators. Pressure Washers.
$319.00 & FREE Shipping. Details Only 7 left in stock (more on the way). Ships from and sold by Amazon.com.

Frequently Bought Together

  • Generac 5791, 800 Running Watts/850 Starting Watts, Gas Powered Portable Inverter
  • +
  • No-Spill 1405 2-1/2-Gallon Poly Gas Can (CARB Compliant)
Total price: $342.92
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Style: 800 Watt
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Compare to Similar Items


This item: Generac 5791, 800 Running Watts/850 Starting Watts, Gas Powered Portable Inverter
Customer Rating 3 out of 5 stars (71) 4 out of 5 stars (82) 3 out of 5 stars (95) 4 out of 5 stars (80)
Price $319.00 $999.00 $589.00 $546.74
Shipping FREE Shipping FREE Shipping $22.11 FREE Shipping
Sold By Amazon.com Hardware Sales Inc. Ron's Home and Hardware Amazon.com
Power Source gas-powered Gasoline-Powered gas-powered NA
Wattage 800 Watts 2000 Watts 2000 Watts 2200 Watts
Voltage 120 Volts 120 Volts 120 Volts 120
Dimensions 15 inches x 18 inches x 10 inches 11.4 inches x 20.13 inches x 16.75 inches 18 inches x 22 inches x 12 inches 17.8 inches x 20.3 inches x 12.5 inches
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Product Description

Style: 800 Watt

Product Description

Designed for life on the road, Generac's iX800 inverter generator featuring a durable, lightweight, compact design with a built-in handle offers clean portable power for camping, tailgating, and recreational use. The iX800 inverter generator provides 800 running watts and 850 starting watts.

From the Manufacturer

Generac's iX Series inverter technology takes the raw power produced by the generator and passes it through a special electronic microprocessor to provide clean and stable power, safe for computers and other sensitive electronic devices. Designed for life on the road, its durable, lightweight, compact design with built-in handle offers portable power for camping, tailgating, and recreational use. Inverter generators utilize a different type of alternator than standard generators to generate AC power. The raw power produced by the generator is converted into AC power by a digital inverter module. The inverter technology reduces the generator's size and weight. But more importantly, it allows the engine to run at varying speeds, significantly reducing noise and fuel consumption levels. The Generac iX Series has clean consistent output power with less than 3% total harmonic distortion especially important with sensitive electronic devices such as computers and DVD players.

Product Details

Style Name: 800 Watt
Warranty [54kb PDF]
  • Product Dimensions: 18 x 10 x 15 inches ; 29 pounds
  • Shipping Weight: 36.6 pounds (View shipping rates and policies)
  • Domestic Shipping: This item is available for shipping in the U.S. except for California and to select countries outside the U.S.
  • International Shipping: This item is not eligible for international shipping. Learn More
  • Origin: USA
  • ASIN: B002NKMG5M
  • Item model number: 5791
  • Average Customer Review: 3.6 out of 5 stars  See all reviews (71 customer reviews)
  • Amazon Best Sellers Rank: #28,137 in Patio, Lawn & Garden (See Top 100 in Patio, Lawn & Garden)
  • Manufacturer’s warranty can be requested from customer service. Click here to make a request to customer service.


From the Manufacturer

iX800 Product Features

Customer Reviews

Top Customer Reviews

Style Name: 2000 Watt Verified Purchase
No problems so far, tested loads up to 2100w for short busts and takes it in stride, 2000w continuous no problem. I am using this for camping and PA speakers/subs. It *IS* noisier than a Y*mah* or H*nda, but hey, it was half the price. As for protecting the primer bulb from rot, I made a "flap" of tape to shield it from UV light. I try to do this whenever I can. I'll keep this review up to date as the genset gets older, 15 hours or so on it now and still trucking.

Update 9/5/2015:

Still cranking first pull and chugging along at 55 hours. Either this thing is getting quieter as it beaks in or I can't hear it anymore... I've since added a cheap inductive timer to better track usage. I changed the oil at 50 hours with Rotella T6, old oil was surprisingly clean. Cleaned/oiled the air filter as well. It was used for a couple weekend camping trips here in Cali since fires are a no-no. Hot plate, task lighting, and everyone's electronics that "needed" charged ;) (~1800w total) at the site no problem. Lovin' this thing! No issues with the primer bulb as the tape flap is still hanging on.
Comment 62 of 62 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Style Name: 800 Watt
Got this unit for a very low price through Amazon.com. Cranked it up and worked ok. Next day it would not hold voltage. took to authorized dealer. 4 weeks later told me the carborator was dirty and not covered by warranty. male bovineshit! the nit needed adjusting. a warranty charge. but why wait for the manufacture to come up with the payment when you can hit the owner with a $75 "clean carburetor" charge. What a rip off.
2 Comments 56 of 58 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Style Name: 800 Watt Verified Purchase
Follow up - August 23rd, 2010:

Generac finally replaced my leaking unit. Hours of work on my part. The new unit idles quite different. On normal mode it idles significantly lower and flucuates up and down. In the economy mode, it simply idles even lower. The first unit seemed to idle normal (who knows) or high. In economy mode it flucuated up and down as stated in the manual. The electrical outlets are different. The first unit had commercial 120v outlets - one plug vertical, one horizontal. I spent $50 for a commercial extension cord. The new unit has regular (parallel) plugs. Therefore I'll need to buy an adaptor. Unbelievable. If there are any more problems I simply will pay someone who knows what they are doing (Generac's service people do not) or throw the unit out. Stay away from this unit. And stay away from Generac.

June, 2010 - Unit was defective out of box. Significant oil leak from engine even when not running. Took to 2 authorized Generac service shops. Still leaks. Leak is where 2 aluminum machine surfaces come together. Still trying to get resolution. Generac customer service fair at best. Takes considerable time to reach a human being. The unit already looks 2 years old due to the handling by the repair people and I've never used it. Generac has still not offered to replace. They "don't make the motors". A great excuse. I will contact Amazon corporate office if necessary to tell them not to sell this company's products and file in small claims court if necessary against Generac. Please consider other manufacturers' if you are looking for a small generator. I may be contacted at nfre at comcast dot net for photos of leak. Thank you.
4 Comments 95 of 103 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Style Name: 2000 Watt
Great Generator except for one very important thing.There is a rubber type primer bulb on the side that will wear out in the sun and burst over time (about 3 weeks) and it cannot be replaced. i had to turn mine in and 5 coworkers units in due to this issue for warranty replacements. so far 2 of the new units primer bulbs have busted again. each time we warranty the item we get the same item back with the same issue. hopefully with enough time we will eventually get a unit without this primer bulb in a new improved version. Until then save your money and the hassle
7 Comments 47 of 52 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Style Name: 800 Watt
I bought this generator to use for charging a battery bank on an RV. I never got it to run for even 10 minutes, when I took it to the factory authorized repair depot they said it had water in the gas, they told Me this before working on it? The tank I fill My equipment with is used on 7 engines none of which had problems. The so called repair I had to pay for and accomplisehed nothing, I still cannot use the generator, and the factory refuses to warranty it. I have two other generators a 6 kw and a 1 kw both constant speed type one of which cost 99 dollars and puts this one to shame. Very poor showing and no warranty beware.
Comment 57 of 64 people found this helpful. Was this review helpful to you? Yes No Sending feedback...
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Style Name: 800 Watt Verified Purchase
I bought the generator to use on my boat to occasounally keep the batteries up when camped away from the marina. I was very disappointed in the loud noise level. It is advertised and also marked on the box as "ultra quiet"; well it is as loud as a lawn mower under load, and I wouldn't want to listen to that noise for hours at a time, nor subject that to fellow boaters nearby. I had expected maybe something that wouldn't be a nuissance and may be nearly as quiet as a Honda. No way, this is unacceptable to have to listen to.
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By Bird Man on July 18, 2011
Style Name: 800 Watt Verified Purchase
Poor repair service. In the 7 months the repair company has had the thing it hasn't been touched. Generac won't approve the repair of a generator that didn't work right out of the box. Worst customer service i have ever seen. DO NOT BUY!!!
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Generac 5791, 800 Running Watts/850 Starting Watts, Gas Powered Portable Inverter
This item: Generac 5791, 800 Running Watts/850 Starting Watts, Gas Powered Portable Inverter
Price: $319.00
Ships from and sold by Amazon.com
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