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Generac GP3600 Spec Review

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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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 who want to be able to use the most necessary devices in their household, even during a blackout

The following sections will present you in detail its power characteristics, the different outlets it offers, its overall portability, the extra features it benefits from, and any relevant emission compliance details.

Power & Run Time

The Generac GP3600 houses a 212 cc Generac OHV 4-stroke engine, which provides 120V, consumes gasoline and delivers a running wattage of 3600W along with a peak wattage of 4500W.

This generator is started via a conventional pull-start mechanism.

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

The quite high THD (<25%) of the GP3600 makes it unsuitable for powering sensitive electronic devices.

Outlets

The control panel includes 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 the following dimensions: L24 x W22.5 x H21.3 in. In combination with its conventional, open frame design, they provide support and allow the generator to be raised above ground level. The featured design is ideal for the outdoors and all tough environments.

Since the generator weighs 105 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). Nevertheless, it can still be moved quite conveniently with the help of its wheel kit (⌀8") and its folding handle, once it is placed on the ground.

Features

Panel of the Generac GP3600

The GP3600's control panel

One of the many GP3600's features is the data center, included in its control panel, which conveniently provides information on the lifetime run hours and thus, helps you monitor its 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 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.

While the standard documentation and an owner's manual (opens in a new tab), helpful for starting the device promptly, come with the Generac GP3600, the following accessories are also included: oil, funnel and tool kit.

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 and thus, may be used 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).

  • With a dry weight of 105 pounds, the Generac GP3600 finds itself in the expected weight range for generators able to produce between 3500 and 4500 rated watts. If weight is your top priority, one of the champions in this power category is the WEN GN400i, weighing just 66.1 pounds.
  • 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. If autonomy is your priority, one of the devices of a similar power output with the highest run time is the Predator 4375, reaching around 16 hours.
  • Even though run times are undoubtedly important, they are dependent on the fuel capacity to a large extent. For a more wholesome picture, we must take into consideration the fuel consumption of the generator. This generator has an average fuel consumption among comparably powerful devices, as it reaches 0.4 GPH (gallon per hour) at a 50% load. If fuel consumption is your top priority, we suggest to check out the Westinghouse iGen4200, which has a fuel consumption of only 0.17 GPH and thus, is one of the most efficient devices in our database.

Price comparison

As you can see from this interactive chart, when compared to other 3500-4500W generators, the Generac GP3600 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
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%
EmissionsCARB
SecurityLow oil and overload protection
Spark arrestorYes
NeutralFloating
Accessories includedOil, funnel, tool kit, and wheel kit
Warranty3 years
SeriesGP
Other model numbers7678

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 generator sizing calculator.
ItemRunning WattsStarting Watts
At homeRefrigerator (energy star)1921192
Hair dryer18001900
Freezer8101750
Set of 5 LED light bulbs5555
Total2857 W3857 W
For campingRadiant heater13001300
RV refrigerator180600
RV AC (11,000 BTU)10101600
Slow cooker270270
Radio100100
Total2860 W3450 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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