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Generac GP3600 - Spec Breakdown

The Generac GP3600 (7678) is a portable open frame generator with a rated wattage of 3600 W and a starting wattage of 4500 W.

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Generac GP3600Generac GP3600Generac GP3600

Description

The GP3600 portable generator is an excellent choice for emergency power when backing up multiple appliances. Featuring PowerRush™ ADVANCED TECHNOLOGY, it delivers 40% more starting capacity allowing you to do more with less. (source: Generac (opens in a new tab))

Zoom on the Generac GP3600

In a nutshell, the Generac GP3600 is a portable generator mostly geared towards:

  • RV travellers wishing to enhance their freedom and nomad lifestyle
  • People occasionally participating in outdoor fairs, festivals or events
  • Homeowners in need of an emergency backup power for their essentials

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 GP3600's design includes a gasoline-fueled 212 cc Generac OHV 4-stroke engine. With a 120V output, it gives a running wattage of 3600W and also a peak wattage of 4500W.

This generator features a simple traditional pull-start mechanism.

Thanks to a fuel capacity of 3.7 gallons, the GP3600 can operate for around 9.3 hours at 50% load with a full tank (fuel consumption around 0.4 GPH).

The powering of sensitive electronic devices with the GP3600 is not recommended due to its relatively high THD (<25%).

Outlets

The control panel features the following 5 AC outlets:

Two Duplexes 120V 20A (5-20R)
120V 30A (L5-30R) receptacle

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.

Portability

The Generac GP3600 has a conventional, open frame design, of the following dimensions: L24 x W22.5 x H21.3 in, which offers support and allows it to be raised above ground level. The device has been designed for tough environments and demanding outdoor use.

As the generator's weight is 105 pounds, manually moving it or transporting it may be challenging, despite the fact that it is technically considered 'portable' (movable). Nevertheless, thanks to its wheel kit (⌀8") and its folding handle (a decent solution to its lack of maneuverability), the generator can be easily moved, once placed the ground.

Features

Panel of the Generac GP3600

The GP3600's control panel

The control panel of the GP3600 includes a digital data center, which assists you in monitoring its status and activity, as it provides information on the lifetime run hours.

The generator allows for a quick, easy and convenient assessment of its gas level, as it is equipped with a built-in fuel gauge.

From a security point of view, the generator is equipped with an overload protection (circuit breaker) and an automatic low oil shut-off, giving you a peace of mind during use.

Apart from the typical documentation and an owner's manual (opens in a new tab), which lets you start it right away, the Generac GP3600 also is packed along with the following accessories: tool kit, funnel and oil.

Emissions

The Generac GP3600 is CARB-compliant. Therefore, its sale and purchase are permitted in all of the 50 states, including California.

Moreover, it features a spark arrestor, so it is adequate for use in forested areas.

The Generac GP3600 versus other generators

The following charts are provided to give you an idea of how some of the key specs of the Generac GP3600 compare to generators of similar power (between 3500 and 4500 W).

  • At a weight of 105 pounds, the Generac GP3600 places in the expected weight range of the generators in the 3500-4500 rated wattage range. In terms of weight, one of the champions in their power range is the WEN GN400i, standing at just 66.1 lbs.
  • Autonomy-wise, with around 9.3 hours on a full tank at a 50% load, the GP3600 is on the low end when compared to other generators of a similar power output. Furthermore, considering the run times, one of the generators which have a roughly same power output, with the highest autonomy, is the Predator 4375, as it provides around 16 hours.
  • Run times are important, yet thanks to their dependence on the fuel capacity, they should be judged along with the fuel consumption of the device. This generator has an estimated fuel consumption of roughly 0.4 GPH (gallon per hour) at a 50% load, rendering it somewhat average compared to devices of a similar output. If you wish to further improve in the area of fuel efficiency, the Westinghouse iGen4200, which boasts with a gas consumption of only 0.17 GPH, may be the right generator for you.
According to our stats, the following comparison is pretty popular: Generac GP3600 vs Generac iQ3500.

Price comparison

As you can see from this interactive chart, when compared to other 3500-4500W generators, the Generac GP3600 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
  • Several accessories included
AVERAGE SPECS:
  • Decent weight (105 lbs)
  • Decent fuel efficiency
WEAKNESSES:
  • No electric start
  • Relatively low run time

Do you own the Generac GP3600 and agree (or disagree) with these strengths and weaknesses?

Let us know and write your own review.

Features and Specifications

General
InverterNo
PortableYes
Parallel capableNo
RV readyNo
FuelGasoline
Engine212 cc Generac OHV 4-stroke
Starting systemRecoil
Power
VoltageAC: 120V 60 Hz
Running watts3600 W
Starting watts4500 W
Running amps30 amps
Peak amps37.5 amps
Run time @50% load9.3 h
Run time @25% loadUnknown
Features
GFCI outletsNo
Covered outletsYes
Automatic Voltage RegulationYes
AC outlets
  • 2x Duplex 120V 20A (5-20R)
  • 1x 120V 30A (L5-30R)
DC outletsNo
Data centerLifetime run hours
IndicatorsNo
Fuel tankSteel, 3.7 gal
Fuel gaugeYes
Misc
Weight105 lbs
Approx. dimensions (L x W x H)24 x 22.5 x 21.3 in
Noise (lower limit)Unknown
THD< 25%
ComplianceCARB
SecurityLow oil and overload protection
Spark arrestorYes
NeutralFloating
Accessories includedOil, funnel, tool kit, and wheel kit
Warranty3 years
SeriesGP
Other model numbers7678
UPC696471074581

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 made in the USA. However, the company provides no information about the origin of their components.

Warranty Information

The Generac GP3600 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 wattage calculator.
ItemRunning WattsStarting Watts
At homeAC (10,000 BTU)15002200
Refrigerator (energy star)1921192
Vacuum cleaner10751175
Radio100100
Total2867 W3867 W
For campingRV AC (11,000 BTU)10101600
RV refrigerator180600
Electric grill16501650
Total2840 W3430 W
For workGrinder14002500
Demolition hammer12601260
Bug zapper8080
Total2740 W3840 W
What is the noise rating of the GP3600?

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

What make is the engine? (Asked April 19, 2020)

The engine is Generac-branded, but neither engineered nor manufactured in the U.S.

Will this gp3600 run an electric pressure washer ? (Asked August 08, 2020)

A basic electric pressure washer usually has a 12 to 13-amp motor, which operates on 120V. 13x120=1560W.

What type of oil and when does it need to be changed (Asked August 14, 2020)

Recommended oil is SAE 10W-30. Here's the oil change schedule recommended by Generac for the GP3600:
Generac GP3600 Maintenance Schedule

What's the purpose of cleaning the spark arrestor every 50 hours ,unfortunately I bought my unit used so I don't have the manual is supposed to go it also where is the serial number located on the generac 3600 Watt unit and last question how many runtime hours before oil changes please let me know thank you so much (Asked September 05, 2021)

You may find the owner's manual here (opens in a new tab). It should give you the answers to all your questions.

Couldn't find the right answer for you? Ask your own question.

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Generac GP3600
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    So far I got to say I really do like my used generac 3600 watt generator is quieter than a typical lawn mower overall seems like it would be great for camping purposes do you believe I’ll enjoy having it

    + PROS:
    • It was just what I was looking for
    - CONS:
    • No problems with it so far
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