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Zoom on the Generac GP15500EFI
In summary, the Generac GP15500EFI is a powerful portable generator especially useful for:
- Professionals who want to be able to deliver results, even during a power failure
- Prudent homeowners who want a backup power source in case of a power outage
In the sections ahead, the power characteristics, availability of various outlets, the portability, and any additional features of the device shall be discussed, including its emission compliance information.
Power & Run Time
The Generac GP15500EFI is powered by a 816 cc Generac G-Force (opens in a new tab) OHV 4-stroke engine. It delivers 120/240V, runs on gasoline and offers a running wattage of 15,500W as well as a peak wattage of 19,300W.
This generator gets running thanks to a convenient and easy-to-use 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.
The GP15500EFI can operate for around 11 hours at 50% load with a full tank (fuel consumption around 1.29 GPH), due to its fuel capacity of 14.2 gallons.
The GP15500EFI produces a clean sine wave: thanks to a <5% Total Harmonic Distortion (THD), your sensitive electronics can be safely plugged in the AC outlets.
The control panel features the upcoming 7 AC outlets:
Even though this Generac generator isn't quite RV Ready, its L5-30R receptacle allows an easy RV connection via an L5-30P to TT-30R adaptor. Besides, as the GP15500EFI holds a twist-lock L14-30R receptacle, it is transfer switch ready: you'll easily be able to connect it to your breaker box to power your home during a power outage.
With its dimensions of L58.5 x W30.9 x H36.5 in, the conventional, open frame design of the Generac GP15500EFI offers stability and allows the generator to be raised above ground level. The device has been designed for tough environments and demanding outdoor use.
Since the generator weighs 420 lbs, it will be incredibly difficult to manually lift it and transport it, even though it is technically considered to 'be portable' (in the sense that it is movable). Still, once it is on the ground, its wheel kit (⌀12") and its folding handle can easily solve the issue of low mobility and allow for easy relocation of the device.
A digital data center, one of the features of the GP15500EFI's control panel, gives you information on the lifetime run hours, and thus, is helpful for the monitoring of its activity and status.
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 product offers an automatic low oil shut-off and an overload protection (circuit breaker), allowing you to use it with a peace of mind.
The GP15500EFI 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 to get you promptly started, Generac also included some oil in the GP15500EFI's packaging.
The Generac GP15500EFI is EPA approved, but NOT CARB-compliant. Thus, it cannot be purchased or sold in California.
However, it features a spark arrestor, which makes it suitable for use in forested areas.
The Generac GP15500EFI versus other generators
The following charts are provided to give you an idea of how some of the key specs of the Generac GP15500EFI compare to generators of similar power (between 14000 and 20000 W).
- As for its weight, the Generac GP15500EFI weighs only 420 pounds, making it one of the lighter generators in the 14000-20000 rated wattage category. If weight is your top priority, one of the champions in this power category is the Generac GP15000E, weighing just 363 pounds.
- Since the GP15500EFI boasts with a run time of around 11 hours at 50% load, it can be safely judged as one of the devices with the highest run time among those of a comparable output.
- Autonomy holds its importance, however, it is largely dependent on the generator’s fuel capacity and so, it is nonsensible to discuss it without mentioning fuel efficiency as well. At an estimated fuel consumption of 1.29 GPH (gallon per hour) at 50% load, this generator is one of the most fuel efficient units within its wattage category.
As you can see from this interactive chart, when compared to other 14000-20000W generators, the Generac GP15500EFI 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
- In the expected price range
- COsense® technology
- GFCI Outlets
- G-Force engine
- Electric start
- Clean sine wave
- Electronic Fuel Injection
- Lightweight for its kind (420 lbs)
- High run time
- Fuel efficient
- No recoil back-up
- No remote start
- Not CARB-compliant
Features and Specifications
|Engine||816 cc Generac G-Force OHV 4-stroke|
|Voltage||AC: 120/240V 60 Hz|
|Running watts||15,500 W|
|Starting watts||19,300 W|
|Running amps (@120/240V)||129.2/64.6 amps|
|Peak amps (@120/240V)||160.8/80.4 amps|
|Run time @50% load||11 h|
|Run time @25% load||Unknown|
|Automatic Voltage Regulation||Yes|
|AC outlets|| |
|Data center||Lifetime run hours|
|Fuel tank||14.2 gal|
|Approx. dimensions (L x W x H)||58.5 x 30.9 x 36.5 in|
|Noise (lower limit)||Unknown|
|Security||Low oil and overload protection, CO monitoring|
|Neutral||Bonded to frame|
|Accessories included||Oil, battery, and wheel kit|
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.
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.
The Generac GP15500EFI 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?
|Item||Running Watts||Starting Watts|
|At home||Electric fry pan||1500||1500|
|Microwave (1000 watts)||1500||1500|
|AC (10,000 BTU)||1500||2200|
|Sump pump (1/2 hp)||1050||2150|
|Refrigerator (energy star)||192||1192|
|Total||12397 W||13897 W|
|For work||Electric welder||9000||9000|
|Total||12280 W||14980 W|
What is the noise rating of the GP15500EFI?
Due to the lack of standardization in noise emission measurement, Generac does not provide their units' noise levels.
Couldn't find the right answer for you? Ask your own question.