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Customer reviews for GP8000E Watt Generator CO-Sense with Transfer Switch Outlet for Home Backup for
GP8000E Watt Generator CO-Sense with Transfer Switch Outlet for Home Backup
4.6 out of 5 stars
stars
589 ratings589 reviews
  1. 5 stars77% (454)
  2. 4 stars15% (87)
  3. 3 stars2% (12)
  4. 2 stars2% (10)
  5. 1 star4% (26)
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Showing 1-10 of 589 reviews
May 19, 2026
Reviewer name: TaylorB
5 out of 5 stars
5 out of 5 stars review

Reliable and Powerful generator.

[This review was collected as part of a promotion.] This generator came almost fully put together. Super simple instructions for putting together/use and I love how powerful it is. It's easy to fuel up and set up the controls aren't to complicated. We used it with multiple bad snowstorms this last year and it never let us down. Would absolutely recommend and it's worth every penny.

Review from generac.com
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Dec 30, 2025
Reviewer name: Ray A
5 out of 5 stars
5 out of 5 stars review

Solid, well-made unit.

This generator is everything it claims to be. Easy to set-up, use and is reliable. I hooked it up to my home for a test-run the day after I received it. It started up instantly and powered the entire "critical function" sub-panel in my home (HVAC, water/well, freezers/refrigerators, water heater (gas), water softener, garage door, washer/dryer (gas), WIFI/network and critical lights/outlets). We built our home in 1998 (just prior to "Y2K", ha!) and included the sub-panel. I toyed with the idea of now installing a whole-home generator - but that would have been an $8-10K investment - this was <$1K. For the roughly one power outage we experience every 2-3 years, this is a good, economical solution.

Review from generac.com
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Dec 27, 2025
Reviewer name: leavanni_1253
5 out of 5 stars
5 out of 5 stars review

Great Generator!!! So grateful for it!!

[This review was collected as part of a promotion.] Wonderful generator! Heavy duty. Gas fueled. Works great and cost effective. The only downside is that it’s very heavy and you need more than one very strong person for initial set up or to even move it and put it together!

Review from generac.com
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Jan 30, 2026
Reviewer name: Norm
5 out of 5 stars
5 out of 5 stars review

Solid Generator

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.

Review from generac.com
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Dec 29, 2025
Reviewer name: Belmore
5 out of 5 stars
5 out of 5 stars review

Great quality

The Generac generator that I purchased for our fiber splicing trailer has been great. We haven't had any issues thus far. It is easy to start and starts quickly even in cold weather. It is very quite compared to most others and the gas usage is very minimal. We are more than pleased with our Generac!

Review from generac.com
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Jan 29, 2026
Reviewer name: chrisfromct
5 out of 5 stars
5 out of 5 stars review

Overall, very good quality and features.

Just bought this a month ago and haven't had the need to use it yet. But I did have to assemble the handle, wheels, add oil and gas and start it. My review is solely based on that. The wheels were relatively easy to assemble, keeping in mind that the machine is heavy and you will need to lift it on blocks, or use a helper. They give you a perfectly shaped funnel to add the oil. Don't lose it. The handles are easy to install and conveniently fold down when not in use. They make it very easy to roll around on the two wheels. You also need to connect the battery wires, which they don't explain very well. Remember Red is positive, Black is negative. My only gripe is with the gas tank cover, though. It is very large, and very low profile, and it is in a sunken area of the tank. It is very difficult to get a grip on it to remove as it is also very tight. Why did they make it like this? I've never had any machine have a cap like this. It does have a convenient fuel level bubble. The gas tank is 8 gallons, not just 5 like my older model. It is rated at a continues 8KW, although the 240V 4-prong cable that connects to the breaker panel is only capable of carrying 7.2KW. You need to use the 2 120V outlets to get a total of 8KW. Keep in mind that the battery does not get recharged by running the engine. You have to use the included wall charger. Although, a single start is not going to use much power, so you don't need to worry too much about always keeping the wall charger connected. But definitely charge it fully when it is new. It has picture-based instructions on the frame. But they aren't very useful as they pictures are too small to figure out what they are saying. Remember to turn the fuel shutoff to ON and set the choke to ON when starting it.

Review from generac.com
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Dec 30, 2025
Reviewer name: melaniel239_9802
5 out of 5 stars
5 out of 5 stars review

Quality Generator

[This review was collected as part of a promotion.] The Generac 5500 generator was very simple and easy to put together. Adding oil and fuel easy as well. Start-up with manual startup was fairly easy. This unit also comes with a battery for an electric start which is pretty cool. The load can handle several small appliances such as a refrigerator, freezer and a TV or you can use it to run a single 220 volt HVAC system by itself. Moving the unit is a breeze as it comes with a handy handle that folds up and down for easy storage. Overall I highly recommend this unit and Generac is well known for their reliability and quality.

Review from generac.com
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Aug 1, 2026
Reviewer name: Mike C
4 out of 5 stars
4 out of 5 stars review

Generator Review

so far, the product has met my expectations. the setup was fairly easy. It would be nice if the manual print had a larger font. It would also be nice if the generator came with a wattage meter.

Review from generac.com
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Jun 15, 2026
Reviewer name: Roger21
4 out of 5 stars
4 out of 5 stars review

Needs a load meter

during recent power outage, the generator work efficiently, running 9 hours on about half a tank of gasoline. However, lacking a load indicator, I had to closely monitor gas usage because I didn't know how much load was being carried so I couldn't know how long the tank of gas would last (based on the literature noting the tank of gas would last approximately 9 hours at half load) This is a great machine, but without a load meter it must be monitored nearly constantly lest it run out of gas...

Review from generac.com
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Dec 31, 2025
Reviewer name: hunvera_9127
4 out of 5 stars
4 out of 5 stars review

Nice generator

[This review was collected as part of a promotion.] This geneator will be great when we are boondocking with our RV! It requires gasoline which is a minus for me because of the smell but at the same time, it is easy to find and purchase. This is a very heavy item, and you will need a friend to move it around!

Review from generac.com
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