Model # 5734

Internet #100662532

Generac 15,000-Watt Gasoline Powered Portable Generator with OHVI Engine


15,000-Watt Gasoline Powered Portable Generator with OHVI Engine

  • Efficient, industrial-grade engine provides extended run times
  • Low oil shutdown safeguards engine from damage
  • Electronic ignition provides easy start up
$269900 /each
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Product Overview

Featuring never-flat wheels, low-tone mufflers and low-oil shutdown, the Generac GP 15,000-Watt Gasoline Powered Portable Generator with OHVI Engine offers quiet, dependable performance when you need energy. An idle control increases fuel efficiency and the included wheel kit and lifting eye allow for effortless transportation. The super-efficient OHVY engine offers extended runtimes for use at jobsites or for backup power sources.

  • 16-gallon fuel tank runs the generator continuously for up to 10 hours at half load; idle control for improved fuel efficiency
  • OHVI engine is designed for extended run times for use at jobsites or for an emergency backup power source
  • Circuit breaker protected outlets for added safety
  • Low-tone mufflers offer whisper-quiet operation
  • Fuel gauge keeps you informed of fuel levels
  • Electronic ignition for easy start up
  • Never-flat wheels and included wheel kit and lifting eye for easier transport
  • 15,000-watt running and 22,500-watt peak power provides reliable power on the go
  • Click on the more info tab to download the specifications pdf to view the wattage requirement guide

Info & Guides

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Product Depth (in.)
Product Height (in.)
Product Length (in.)
Product Width (in.)


Built-in inverter
CA (CARB) Compliant
Not CARB Compliant
Continuous Wattage
Engine Displacement (cc)
Engine Make
OEM Branded
Fuel Tank Capacity (gallons)
Fuel type
Full load fuel consumption (gallons/hour)
Generator Features
Auto Idle Control,Automatic Voltage Regulation,Fuel Gauge,GFCI Outlet(s),Low Oil Shutdown,Wheel Kit
Horsepower (hp)
0 hp
Number of circuits/outlets
Operational volume (dB)
Osha Required GFCI Outlets
Peak Wattage
Product Weight (lb.)
Run time at 50% load (hours/tank)
Voltage (volts)

Warranty / Certifications

Certifications and Listings
EPA Approved
Manufacturer Warranty

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Customer Questions & Answers

How loud is this generator?

Asked by: Anonymous
I'm am amazed that Generac doesn't offer any sound levels, a typical measurement is 1 meter under 50 % load.
Answered by: DoctorPC
Date published: 2016-08-29

Will this unit run an electric range and/or an A/C unit?

Asked by: Anonymous
Yes, it will run way more than just that. Mine will run my 4 ton A/C unit along with everything in the house
Answered by: beartrouble
Date published: 2017-06-12

Can this generator run a 200 amp panel?

Asked by: Anonymous
It can provide about 130 amps @ 120 volts. Should he able to use a 10 breaker manual transfer switch. Consult with a licensed electrician to hook it up, this is something shouldn't do on your own.
Answered by: PeterH845
Date published: 2016-10-20

Can the Generac GPS 15000 generator be easily converted to run on Propane or gasoline?

Asked by: Anonymous
No. It is designed to only run on gasoline. Some 3rd party makers make products to convert gasoline generators to propane, but honestly I'm not going to make an unauthorized modification, lose my UL listing on the product so when the item burns my house down, the insurance can deny my claim because I modified the product and lost the UL listing.
Answered by: PeterH845
Date published: 2016-03-14
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Customer Reviews

15,000-Watt Gasoline Powered Portable Generator with OHVI Engine is rated 4.5 out of 5 by 86.
Rated 5 out of 5 by from Very satisfied I cannot argue against Generac generators. For reliability, dependability and overall satisfaction I recommend getting yourself a Generic. Yes, Generacs' do cost a little more but you get what you pay for. However they are not the most expensive generator company. So, don't skimp on safety and comfort due to price. Go the extra mile and buy yourself a piece of mind. I bought myself a portable generator GP1500E to be sure I have what I need.
Date published: 2017-03-13
Rated 5 out of 5 by from Very satisfied, this is a very well built and thoughtfully engineered machine. This generator rep... Very satisfied, this is a very well built and thoughtfully engineered machine. This generator replaces a smaller 5500 watt unit which powered basic circuits during power outages. With this unit I plan to power most of the household including central AC.
Date published: 2017-05-16
Rated 5 out of 5 by from we thought with the price, the electrical cord would have... we thought with the price, the electrical cord would have been included but otherwise very happy with the generator.
Date published: 2017-05-16
Rated 5 out of 5 by from Started up with no problem right out of the box.... Started up with no problem right out of the box. I have a 50 amp and 30 amp plugged in all day with no problem.
Date published: 2017-04-19
Rated 5 out of 5 by from Totally First Class Every detail has quality written all over it, very happy that I bought a Generac.
Date published: 2017-02-08
Rated 5 out of 5 by from GP15000E This generator and i have been through two hurracains Just before August 9, 2004 – August 15, 2004 I acquired the GP15000E for construction work that i was doing at the time. some of my co workers said that for just for me using portable power it was way overkill but hey i'm just that way. So the overkill came in handy when Hurricane Charley arrived. Charley was brutal, killed power every where. Lucky for me, overkill and I had a lot of Power to run. I was lucky my neighbor was an electrician because i was just going to run fans and and a fridge. he happened to be around to help. In exchange for him hooking Overkill directly to my house"s breaker box so we can run the air conditioner I let him and his wife and his two little babies bunk with us which he really appreciated and so did i for his service. It was a hot for those four days that we went with out regular power but Overkill was a great investment. Not only that i went through with Charley but also moved to Texas just in time for Hurricane Ike in September 1, 2008 – September 15, 2008. Went three days with out regular power on that deal. There has been a few storms since then that my trusty Overkill has pulled me through some power outages. I would recommend for anybody to have a Generator of some sort but i recommend Generac because so far i have not had any problems with my Overkill, I"m glad i have that tool in my war chest. As a matter of fact a storm blew through Huntsville Texas yesterday 3/24/2017 that knocked down trees on the power lines that left me once again without power for about 10 hrs. Lucky for me i have Overkill here to save the day. well that my story , hope this helps you out with your decision on what power to buy
Date published: 2017-03-25
Rated 5 out of 5 by from Outstanding Product The generator arrived in perfect condition. The packaging was outstanding. It took about 20 minutes from the time it was it was uncrated until it was running. It was connected to my 2100 square foot home and it ran the whole house. That included a 5 ton AC, electric clothes dryer, lights, ceiling fans, chest freezer, refrigerator, water well pump and TV's..................the whole house. It never "bogged" down or missed a beat. Noise is moderate....but with doors and windows closed with the TV on I never noticed it. It came with an extra air filter, fuel filter, some Sta-Bil fuel treatment and 2 spark plugs which I thought was a very nice touch. It is heavy but well balanced and easy to move about. Great product for a reasonable price.
Date published: 2013-03-05
Rated 4 out of 5 by from Awesome value, but loud This generator is an awesome value... a lot cheaper than other brands. We bought this to power a 3 hp regenerative blower, and it does it with ease. Burns 1-1.5 gallons per hour under the loads we have (blower and lights). Comes with first oil and air filter change filters, but not enough oil to refill the scond time. Digital hour meter with countdown to required maintenance is great! No generator is perfect, and this one does have some drawbacks. It is really loud and I've noticed that the fuel gauge doesn't float freely anymore after about 60 hours of use.
Date published: 2012-05-04
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