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Generac GP15000E - 15000/22500W Portable Generator With Electric Start

The Generac GP15000E (5734) is a powerful open frame generator with a rated wattage of 15,000 W and a starting wattage of 22,500 W. (Read full specs)

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Generac GP15000EGenerac GP15000EGenerac GP15000EGenerac GP15000E
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Description

A portable unit ideal for applications requiring a large amount of power without being permanent. Ideal for job sites and emergency applications. (source: Generac (opens in a new tab))

Zoom on the Generac GP15000E

In a nutshell, the Generac GP15000E is a powerful portable generator mostly geared towards:

  • Professionals who want to be able to deliver results, even during a power failure
  • Homeowners who wish to power almost all appliances in their house under any circumstances

In the following paragraphs, we shall explore the power characteristics, available outlets, portability, and any additional features of the device.

Power & Run Time

The Generac GP15000E in use

The Generac GP15000E

The Generac GP15000E's engine, 992 cc Generac OHVI 4-stroke, fueled by gasoline, can deliver 120/240V. It provides a running wattage of 15,000W and reaches a peak wattage of 22,500W.

This generator utilizes a user-friendly and efficient electric starter (battery included) for startup.

The GP15000E can operate for around 10 hours at 50% load with a full tank (fuel consumption around 1.6 GPH), due to its fuel capacity of 16 gallons.

The GP15000E is unsuitable for the powering of sensitive electronic devices due to its high THD (<20%).

Outlets

The control panel features the following 8 AC outlets:

Duplex 120V 20A (5-20R) GFCI
Duplex 120V 20A (5-20R)
Two 120V 30A (L5-30R) receptacles
120/240V 30A (L14-30R) receptacle
120/240V 50A (14-50R) receptacle

Furthermore, it showcases 1 DC outlet: there's a 12V 10A receptacle allowing you to easily charge your batteries.

While this Generac generator is not RV Ready, its L5-30R receptacle can be used for a simple RV connection with an L5-30P to TT-30R adaptor. Besides, thanks to its twist-lock L14-30R receptacle, the GP15000E is transfer switch ready, facilitating easy hookup to your breaker box to provide backup power for your home during blackouts.

Portability

Measuring L48.5 x W31 x H39.5 in, the Generac GP15000E showcases a classic open frame layout, guaranteeing stability and simple maintenance access to components, while facilitating air circulation. The device has been designed for tough environments and demanding outdoor use.

While technically classified as 'portable' due to its ability to be moved, the 363 lbs of this generator make manual lifting and transportation incredibly difficult. However, the constrained maneuverability is addressed with the assistance of its wheel kit (⌀12.3") and its handle, allowing for easy shifting once the generator is placed on the ground.

A lift hook located on the top of the frame offers an additional safety feature while facilitating the transport, loading and unloading of the generator.

Features

Panel of the Generac GP15000E

The GP15000E's control panel

Designed with a digital data center, the control panel of the GP15000E grants you access to crucial data on the lifetime run hours, ensuring practical monitoring of its status and activity.

A built-in fuel gauge allows for a quick, easy and convenient check of the fuel level of the generator.

From a security standpoint, the generator is furnished with an automatic low oil shut-off and an overload protection (circuit breaker), ensuring peace of mind during operation.

Beyond the standard documentation and an owner's manual (opens in a new tab) to assist with setup, the Generac GP15000E ships with supplementary accessories: funnel and tool kit.

Product Video

The Generac GP15000E versus other generators

The following charts are provided to give you an idea of how some of the key specs of the Generac GP15000E compare to generators of similar power (between 14000 and 20000 W).

  • Considering its weight, the Generac GP15000E registers at a modest 363 pounds, placing it among the lightest generators in the 14000 to 20000 rated wattage selection.
  • The GP15000E's runtime of around 10 hours at a 50% load on a full tank positions it within the average autonomy range compared to other generators with similar power. Furthermore, considering the run times, one of the generators which have a roughly same power output, with the highest autonomy, is the Westinghouse WGen20000, as it provides around 11 hours.
  • Run time is a key metric, but it's dependent on the generator's fuel capacity. Therefore, discussing fuel efficiency is necessary to get the full picture. At a 50% load, the generator consumes an estimated 1.6 gallons of gasoline per hour, falling within the average consumption range of units with similar output. If you are concerned with gasoline efficiency, having a fuel consumption of just 1.29 GPH, the Generac GP15500EFI is a device you could look out for.

Price comparison

As you can see from these interactive charts, when compared to other 14000-20000W generators, the Generac GP15000E is on the cheap side of the price range.

It can therefore be a really good buy if you're looking to acquire a budget generator.

The bottom line

STRENGTHS:
  • Inexpensive
  • Several accessories included
  • GFCI Outlets
  • Impressive quantity of AC outlets
  • 5 different AC outlet types
  • Electric start
  • Lightweight for its kind (363 lbs)
  • Made in USA
AVERAGE SPECS:
  • Decent run time
  • Decent fuel efficiency
WEAKNESSES:
  • No recoil back-up
  • No remote start

Do you own the Generac GP15000E and agree (or disagree) with these strengths and weaknesses?

Let us know and write your own review.

Features and Specifications

General
InverterNo
Parallel capableNo
RV readyNo
FuelGasoline
Engine992 cc Generac OHVI 4-stroke
Starting systemElectric
Warranty2 years
Power
VoltageAC: 120/240V 60 Hz, DC: 12V
Running watts15,000 W
Starting watts22,500 W
Running amps (@120/240V)125/62.5 amps
Peak amps (@120/240V)187.5/93.8 amps
Run time @50% load10 h
Run time @25% loadUnknown
Features
GFCI outletsYes
Covered outletsNo
Automatic Voltage RegulationYes
AC outlets
  • 1x Duplex 120V 20A (5-20R) GFCI
  • 1x Duplex 120V 20A (5-20R)
  • 2x 120V 30A (L5-30R)
  • 1x 120/240V 30A (L14-30R)
  • 1x 120/240V 50A (14-50R)
DC outlets1x 12V 10A receptacle
Data centerLifetime run hours
IndicatorsNo
Fuel tank16 gal
Fuel gaugeYes
Misc
Weight363 lbs
Approx. dimensions (L x W x H)48.5 x 31 x 39.5 in
Noise (lower limit)Unknown
THD< 20%
ComplianceEPA
SecurityLow oil and overload protection
Spark arrestorYes
NeutralFloating
Accessories includedFunnel, tool kit, battery, and wheel kit
Country of originUSA
Other model numbers5734
UPC696471057348

Unlike many websites, we did our best to research each of the specs above. That being said, we are not immune to making the occasional mistake or omission. Should you notice any missing or incorrect values, don't hesitate to suggest improvements so we can address the issue.

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About Generac

Generac Power Systems is an American based generator and power equipment manufacturer, founded in 1959. As its name suggests, the main focus of Generac are power generators, and other related electric equipment, such as switches, paralleling systems and small engines. The company has several manufacturing facilities based in the US, thus, their products are engineered and built in the USA. However, their components can be a mix of domestic and foreign parts.

Warranty Information

The Generac GP15000E is covered under a warranty for up to 2 years. This warranty may be limited and may not cover all parts of the generator.
For more information about the warranty of Generac generators, please consult Generac's warranty policies (opens in a new tab). Alternatively, you can also contact their Customer Support: 1-888-GENERAC (888-436-3722).

Questions & Answers

What can it power?
Examples of items that can be simultaneously powered.
The examples below are based on a maximum load of 80% and estimated wattages. For a more accurate estimation, use our generator sizing calculator.
ItemRunning WattsStarting Watts
At homeAC (10,000 BTU)15002200
Electric fry pan15001500
Dish washer15003000
Microwave (1000 watts)15001500
Sump pump (1/2 hp)10502150
Refrigerator (energy star)1921192
Electric range21002100
Hair dryer18001900
Freezer8101750
Pair of small speakers4545
Total11997 W13497 W
For workElectric welder90009000
Table saw18004500
Belt sander11502400
Total11950 W14650 W
What is the noise rating of the GP15000E?

Due to the lack of standardization in noise emission measurement, Generac does not provide their units' noise levels.

Oil capacity? (Asked February 15, 2020)

With filter change, 54.4 fl. oz. Without filter change 44.8 fl. oz.

I read something about it not being good for electonic devices like computer maybe i read something wrong? (Asked February 08, 2022)

The unit is not suitable for powering equipment that contains sensitive electronic components. You may want to consider an inverter generator or a generator with a low THD. You may also want to read more about Total Harmonic Distortion (THD).

The replacement battery for a 15000 E generac generatore has to be 12 volts how many amps (Asked October 30, 2022)

The original battery part number is 0D4575, which is a 35Ah battery.

Does the GP15000E have 240 volt capability (Asked January 17, 2024)

Yes, through its 14-50R and L14-30R outlets.

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