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Generac GP18000EFI - 18000/22500W Portable Generator With Electric Start

The Generac GP18000EFI (8917) is a powerful open frame generator with a rated wattage of 18,000 W and a starting wattage of 22,500 W. (Read full specs)

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Generac GP18000EFIGenerac GP18000EFI
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Price History
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Price history for the Generac GP18000EFI
Latest updates:
  • $3,959.10 - June 8, 2024
  • $4,399.00 - March 15, 2024
Data source: homedepot.com
Since: March 15, 2024
  • Highest Price: $4,399.00 - March 15, 2024
  • Lowest Price: $3,959.10 - June 8, 2024

Description

Zoom on the Generac GP18000EFI

In a nutshell, the Generac GP18000EFI is a powerful portable generator mostly geared towards:

  • Professionals who want to ensure that a power failure will not prevent them from working
  • Prudent homeowners who want a backup power source in case of a power outage

Over the following sections, you'll uncover its power characteristics, the selection of outlets it offers, its overall portability, and the supplementary features it includes.

Power & Run Time

Running on gasoline, the Generac GP18000EFI operates with a 816 cc Generac G-Force OHV 4-stroke engine, delivering 120/240V, with a running wattage of 18,000W and a peak wattage of 22,500W. The impressive running wattage makes this unit the 2nd biggest portable generator currently on the market, along with the Powerhorse 27000.

Its starting mechanism relies on a practical and straightforward electric starter (battery included).

The Electronic Fuel Injection (EFI) system enhances the engine's reliability, lowers fuel consumption, improves startup, reduces servicing, boosts stale fuel resistance, and offers better altitude adaptability.

Featuring a 14.2 gallons fuel tank, the GP18000EFI can provide power for around 9 hours at 50% load on a full tank (with fuel consumption averaging 1.58 gallons per hour).

As the GP18000EFI produces a clean sine wave, with a <5% Total Harmonic Distortion (THD), sensitive electronics may be plugged in the AC outlets safely.

Outlets

The control panel includes the following 7 AC outlets:

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

Despite not meeting the 'RV Ready' criteria, this Generac generator grants the advantage of simple RV compatibility via its L5-30R receptacle, enabling you to conveniently power your RV by using an L5-30P to TT-30R adaptor. Besides, as it features a twist-lock L14-30R receptacle, the GP18000EFI is transfer switch ready: in case of a power outage, you will be easily able to connect it to a breaker box and power your household.

Portability

Measuring L58.5 x W30.9 x H36.5 in, the Generac GP18000EFI showcases a classic open frame layout, guaranteeing stability and simple maintenance access to components, while facilitating air circulation. The design is ideal for rough environments and demanding outdoor use.

Although this generator is technically considered 'portable' (in the sense that it can be moved), its 442.8 lbs make it incredibly difficult to manually lift and transport. However, the constrained maneuverability is addressed with the assistance of its wheel kit (⌀12") and its folding handle, allowing for easy shifting once the generator is placed on the ground.

Features

Panel of the Generac GP18000EFI

The GP18000EFI's control panel

Embedded in the control panel of the GP18000EFI, a digital data center serves as a vital feature, offering comprehensive information on the lifetime run hours to aid in monitoring activity and status.

The generator includes a built-in fuel gauge, a quick, easy and convenient method of checking the device’s gas level.

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

The GP18000EFI also benefits from Generac’s COsense® carbon monoxide monitoring. This technology senses and manages CO output and shuts down the unit when necessary, to protect you from CO poisoning.

Besides the usual set of documentation and owner's manual (opens in a new tab) to get you promptly started, Generac also included some oil in the GP18000EFI's packaging.

The Generac GP18000EFI versus other generators

The following charts are provided to give you an idea of how some of the key specs of the Generac GP18000EFI compare to generators of similar power (between 14000 and 20000 W).

  • At 442.8 lbs in dry weight, the Generac GP18000EFI fits well within the typical weight bracket for generators producing 14000 to 20000 rated watts. If weight is your top priority, one of the champions in this power category is the Westinghouse WGen14500TFc, weighing just 348.3 pounds.
  • As for its runtime, the GP18000EFI runs for around 9 hours at a 50% load, placing it towards the low end among comparable products. Concerning the run times, one of the several devices with a comparable output, offering the highest autonomy, is the Westinghouse WGen20000, which is able to run for around 11 hours.
  • The run time is important, but also hugely depends on the capacity of the fuel tank and doesn't mean much if we don't talk about fuel consumption as well. This generator reaches an estimated fuel consumption of 1.58 GPH (gallon per hour) at a 50% load, making it average, for the previously mentioned wattage range. If not satisfied with the afore-mentioned fuel consumption, you may wish to check out the Westinghouse WGen14500TFc. With a fuel consumption of as little as 1.05 GPH, it is one of the most efficient generators currently on the market.

Price comparison

As you can see from these interactive charts, when compared to other 14000-20000W generators, the Generac GP18000EFI is on the average side of the price range.

Therefore, this generator nicely fits in the expected budget for this kind of product.

The bottom line

STRENGTHS:
  • In the expected price range
  • COsense® technology
  • GFCI Outlets
  • 4 different AC outlet types
  • G-Force engine
  • Electric start
  • Clean sine wave
  • Electronic Fuel Injection
AVERAGE SPECS:
  • Decent weight (442.8 lbs)
  • Decent fuel efficiency
WEAKNESSES:
  • No recoil back-up
  • No remote start
  • Relatively low run time

Do you own the Generac GP18000EFI 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
Engine816 cc Generac G-Force OHV 4-stroke
Starting systemElectric
Warranty3 years
Power
VoltageAC: 120/240V 60 Hz
Running watts18,000 W
Starting watts22,500 W
Running amps (@120/240V)150/75 amps
Peak amps (@120/240V)187.5/93.8 amps
Run time @50% load9 h
Run time @25% loadUnknown
Features
GFCI outletsYes
Covered outletsYes
Automatic Voltage RegulationYes
AC outlets
  • 2x Duplex 120V 20A (5-20R) GFCI
  • 1x 120V 30A (L5-30R)
  • 1x 120/240V 30A (L14-30R)
  • 1x 120/240V 50A (14-50R)
DC outletsNo
Data centerLifetime run hours
IndicatorsNo
Fuel tank14.2 gal
Fuel gaugeYes
Misc
Weight442.8 lbs
Approx. dimensions (L x W x H)58.5 x 30.9 x 36.5 in
Noise (lower limit)Unknown
THD< 5%
ComplianceCARB, EPA
SecurityLow oil and overload protection, CO monitoring
Spark arrestorYes
NeutralBonded to frame
Accessories includedOil, battery, and wheel kit
UPC696471101324

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 GP18000EFI is covered under a warranty for up to 3 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 size calculator.
ItemRunning WattsStarting Watts
At homeElectric fry pan15001500
Microwave (1000 watts)15001500
Dish washer15003000
AC (10,000 BTU)15002200
Sump pump (1/2 hp)10502150
Refrigerator (energy star)1921192
Clothes dryer54006750
Electric grill16501650
Radio100100
Total14392 W15892 W
For workElectric welder90009000
Table saw18004500
Air compressor (1 hp)16006100
Grinder14002500
Drain cleaner250250
Electric fence (25 miles)250250
Bug zapper8080
Total14380 W18880 W
What is the noise rating of the GP18000EFI?

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

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