Generac GP3600 - 3600/4500W Portable Generator
The Generac GP3600 (7721) is a portable open frame generator with a rated wattage of 3,600 W and a starting wattage of 4,500 W. (Read full specs)
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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.
Zoom on the Generac GP3600
In a few words, the Generac GP3600 is a portable generator perfectly suited for:
- RV travellers wishing to enhance their freedom and nomad lifestyle
- People occasionally participating in sporting competitions, open-air performances and outdoor festivals
- Homeowners who want to be sure of their ability to power their fridges, cooking tools, heating and lighting equipment during power failures
- Professionals who want to ensure that a power failure will not prevent them from working
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
The Generac GP3600 is powered by a 212 cc Generac OHV 4-stroke engine. It delivers 120V, runs on gasoline and offers a running wattage of 3,600W as well as a peak wattage of 4,500W.
This generator features a traditional recoil pull-start mechanism.
The fuel capacity of 3.7 gallons allows the GP3600 to operate for around 9.3 hours at 50% load with a full tank (fuel consumption around 0.4 GPH).
Due to the high THD (<25%) of the GP3600, it is advised against using it for powering sensitive electronic devices.
Outlets
The control panel is equipped with the following 5 AC outlets:
This Generac generator isn't quite RV Ready, but it features an L5-30R receptacle, allowing a simple RV connection through an L5-30P to TT-30R adaptor.
Portability
With dimensions of L24 x W22.5 x H21.3 in, the standard open frame design of the Generac GP3600 provides stability and easy maintenance access to components, as well as good air circulation. This type of design is ideal for tough environments and heavy outdoor use.
The 105 lbs of the GP3600's dry weight enables you to use it anywhere you will ever need. Furthermore, thanks to its wheel kit (⌀8") and its folding handle, shifting the generator once it's placed is a breeze.
Features
The GP3600's control panel
A digital data center, one of the features of the GP3600's control panel, gives you information on the lifetime run hours, and thus, is helpful for the monitoring of its activity and status.
Featuring a built-in fuel gauge, the generator offers quick, convenient, and easy gas level checks at a glance.
In terms of security, the generator features an automatic low oil shut-off and an overload protection (circuit breaker), ensuring peace of mind during its use.
The GP3600 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.
Apart from the standard documentation and an owner's manual (opens in a new tab) to facilitate setup, the Generac GP3600 features extra accessories: tool kit, oil and funnel.
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).
- Since the generator weighs in at a dry weight of 105 lbs, the Generac GP3600 belongs in the expected weight range for devices which can produce between 3500 and 4500 rated watts. In terms of weight, one of the champions in their power range is the WEN 56432iX, standing at just 52.9 lbs.
- Regarding its runtime, the GP3600 operates for around 9.3 hours at a 50% load, positioning it at the lower spectrum among comparable products. If you wish to prioritize autonomy, the NorthStar c5500 shines as one of the top contenders, offering one of the highest run times among generators with similar power output, totaling around 15.1 hours.
- While run time matters, it's heavily influenced by the fuel tank's capacity. Hence, it's important to consider fuel efficiency alongside. With an estimated fuel consumption of 0.4 GPH at a 50% load, this generator aligns with the average gasoline usage range of comparable products. To prioritize fuel savings, we advise considering the Westinghouse iGen5000DF, which stands out for its gasoline efficiency, consuming just 0.23 gallons per hour.
The bottom line
- COsense® technology
- GFCI Outlets
- Decent weight (105 lbs)
- Decent fuel efficiency
- 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
| Inverter | No |
|---|---|
| Parallel capable | No |
| RV ready | No |
| Fuel | Gasoline |
| Engine | 212 cc Generac OHV 4-stroke |
| Starting system | Recoil |
| Warranty | 3 years |
| Voltage | AC: 120V 60 Hz |
|---|---|
| Running watts | 3,600 W |
| Starting watts | 4,500 W |
| Running amps | 30 amps |
| Peak amps | 37.5 amps |
| Run time @50% load | 9.3 h |
| Run time @25% load | Unknown |
| GFCI outlets | Yes |
|---|---|
| Covered outlets | Yes |
| Automatic Voltage Regulation | Yes |
| AC outlets |
|
| DC outlets | No |
| Data center | Lifetime run hours |
| Indicators | No |
| Fuel tank | Steel, 3.7 gal |
| Fuel gauge | Yes |
| Weight | 105 lbs |
|---|---|
| Approx. dimensions (L x W x H) | 24 x 22.5 x 21.3 in |
| Noise (lower limit) | Unknown |
| THD | < 25% |
| Compliance | EPA, ANSI/PGMA G300-2023 |
| Security | Low oil and overload protection, CO monitoring |
| Spark arrestor | Yes |
| Accessories included | Oil, funnel, tool kit, and wheel kit |
| Series | GP |
| Other model numbers | 7721 |
| UPC | 696471086270 |
We've taken extra care to research and verify each of the specifications above. That said, occasional mistakes or omissions are still possible. If you spot any missing or inaccurate information, feel free to suggest a correction so we can address it.
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 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?
| Item | Running Watts | Starting Watts | |
|---|---|---|---|
| At home | Refrigerator (energy star) | 192 | 1192 |
| Hair dryer | 1800 | 1900 | |
| Freezer | 810 | 1750 | |
| Set of 5 LED light bulbs | 55 | 55 | |
| Total | 2857 W | 3857 W | |
| For camping | Radiant heater | 1300 | 1300 |
| RV refrigerator | 180 | 600 | |
| RV AC (11,000 BTU) | 1010 | 1600 | |
| Slow cooker | 270 | 270 | |
| Radio | 100 | 100 | |
| Total | 2860 W | 3450 W | |
| For work | Grinder | 1400 | 2500 |
| Demolition hammer | 1260 | 1260 | |
| Bug zapper | 80 | 80 | |
| Total | 2740 W | 3840 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:
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.
Is it necessary to run non-ethenol gasoline? (Asked October 08, 2024)
Up to 10% ethanol is acceptable.
Couldn't find the right answer for you? Ask your own question.
User Reviews
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