Predator 3500 - Spec Breakdown

The Predator 3500 (59137) is a quiet and compact inverter generator with a rated wattage of 3000 W and a starting wattage of 3500 W.

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Price History
Price history for the Predator 3500
Latest updates:
  • $899.99 - April 19, 2022
  • $799.99 - April 15, 2022
  • $899.99 - April 12, 2022
  • $799.99 - April 8, 2022
  • $899.99 - March 14, 2022
Data source: harborfreight.com
Since: March 14, 2022
  • Highest Price: $899.99 - March 14, 2022
  • Lowest Price: $799.99 - April 8, 2022


Zoom on the Predator 3500

In summary, the Predator 3500 is a quiet and compact portable inverter generator especially useful for:

  • RV travellers looking for even more independence
  • Occasional participants of outdoor events, competitions, concerts and festivals
  • Amateur DIY lovers
  • Homeowners who want to be able to use the most necessary devices in their household, even during a blackout
  • Camping and tailgating buffs looking to enhance their experience

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 Predator 3500 in use

The Predator 3500

The Predator 3500's engine, 212 cc (6 hp) OHV 4-stroke, fueled by gasoline, can deliver 120V. It provides a running wattage of 3000W and reaches a peak wattage of 3500W. In addition, the device is parallel capable (parallel kit (opens in a new tab) not included) and thus, can be linked to a similar or compatible unit for added power.

With a noise rating of 56 dBA (less noisy than a quiet suburb), the inverter generator features a conventional pull-start mechanism, but also a convenient and easy-to-use electric starter (battery included).

The 3500 can operate for up to 11 hours with a full tank (fuel consumption around 0.24 GPH), due to its fuel capacity of 2.64 gallons.

The 3500 produces a clean sine wave: thanks to a <5% Total Harmonic Disruption (THD), your sensitive electronics can be safely plugged in the AC outlets.


The control panel provides the upcoming 3 AC outlets:

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

Additionally, it features 1 DC outlet: there's a 12V 8A receptacle with which charging your batteries is made easy.

Even though this Predator generator isn't quite RV Ready, its L5-30R receptacle allows an easy RV connection via an L5-30P to TT-30R adaptor (included).


The Predator 3500 is an inverter generator and has an encased design of the following dimensions: L22.8 x W17.3 x H20 in. Thus, it is more aesthetical than conventional, open frame products. The generator has a contemporary design, convenient for recreationally generating power.

While the generator is considered to be technically 'portable' (in the sense that you can move it), manually lifting and transporting it may be challenging, due to its high weight of 102 lbs. However, its challenging mobility is solved by its set of 4 wheels and its double handle, which will ease its displacement, once it is on the floor.


Panel of the Predator 3500

The 3500's control panel

The control panel of the 3500 includes a digital data center, which assists you in monitoring its status and activity, as it provides information on the lifetime run hours, power output and voltage.

In addition to this info, some light indicators allow you to instantly see if the generator is on overload, its oil levels are insufficient and the generator is ready.

A built-in fuel gauge allows for a quick, easy and convenient check of the fuel level of the inverter generator.

As far as security is concerned, the generator can be used with a peace of mind, as it features an overload protection (circuit breaker) and an automatic low oil shut-off.

The unit also benefits from the Predator's CO SECURE™ carbon monoxide detection. This system monitors the accumulation of CO gas while the generator is running and will shut off the engine if the levels become dangerously high. It’s a welcomed additional security feature, but don’t forget to always take your generator outside (opens in a new tab).

With the basic documentation and an owner's manual (opens in a new tab), letting you start the generator quickly, the Predator 3500 also comes with several accessories, including: battery charging cables, funnel, tool kit and RV adapter. A storage cover is also available, as a separate purchase.


The Predator 3500 is EPA-approved and CARB-compliant. It can therefore be sold and purchased in all 50 states, including California.

Moreover, it features a spark arrestor, making it usable in forested areas.

The Predator 3500 versus other generators

The following charts are provided to give you an idea of how some of the key specs of the Predator 3500 compare to generators of similar power (between 2500 and 3500 W).

  • With a dry weight of 102 pounds, the Predator 3500 finds itself in the expected weight range for generators able to produce between 2500 and 3500 rated watts. In terms of weight, one of the champions in their power range is the Genmax GM3300i, standing at just 47.4 lbs.
  • With a lowest possible noise of 56 dBA, this inverter generator places itself amongst the more quiet of the products delivering similar power. If noise emissions are important to you, one of the least noisy generators of this power range is the Honda EU3000iS with only 50 dBA.
  • Regarding its autonomy, the autonomy of the 3500, reaching up to 11 hours at a 25% load, can be considered as low end, compared to other products of a roughly equal output. If autonomy is your priority, one of the devices of a similar power output with the highest run time is the Champion 200914, reaching up to 22 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 inverter generator is rather wasteful, compared to other devices within the aforementioned output range, when it comes to gasoline consumption, as it reaches roughly 0.24 GPH at a 25% load. If you wish to further improve in the area of fuel efficiency, the Energizer eZV3500P, which boasts with a gas consumption of only 0.13 GPH, may be the right generator for you.

Price comparison

As you can see from this interactive chart, when compared to other 2500-3500W generators, the Predator 3500 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
  • CO SECURE™ technology
  • Several accessories included
  • RV adapter included
  • Electric start
  • Parallel capable
  • Inverter
  • Quiet for its power (56 dBA)
  • Decent weight (102 lbs)
  • No remote start
  • Weak warranty
  • Relatively low run time
  • Low fuel efficiency

Do you own the Predator 3500 and agree (or disagree) with these strengths and weaknesses?

Let us know and write your own review.

Features and Specifications

Parallel capableYes, cable not included
RV readyNo
Engine212 cc OHV 4-stroke
Starting systemRecoil, Electric
VoltageAC: 120V 60 Hz, DC: 12V
Running watts3000 W
Starting watts3500 W
Running amps25 amps
Peak amps29.2 amps
Run time @50% loadUnknown
Run time @25% load11 h
GFCI outletsNo
Covered outletsNo
Automatic Voltage RegulationInverter
AC outlets
  • 1x Duplex 120V 20A (5-20R)
  • 1x 120V 30A (L5-30R)
DC outlets1x 12V 8A receptacle
Data centerPower output, lifetime run hours and voltage
IndicatorsLow oil, overload and output ready
Fuel tank2.64 gal
Fuel gaugeYes
Weight102 lbs
Approx. dimensions (L x W x H)22.8 x 17.3 x 20 in
Noise (lower limit)56 dBA
THD< 5%
ComplianceCARB, EPA, ANSI/PGMA G300-2018
SecurityLow oil and overload protection, CO monitoring
Spark arrestorYes
Accessories includedFunnel, tool kit, RV adapter, battery charging cables, and battery
Warranty90 days
Other model numbers56720, 63584, 59137

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 Predator

Predator portable generators are solely distributed by the Harbor Freight Corporation, which has an impressive list of over 200 trademarked products. The Predator brand is one of their newer lines of outdoor power products. As with many other makes and models of power equipment sold by Harbor Freight, Predator generators are manufactured in China.

Warranty Information

The Predator 3500 is covered under a warranty for up to 90 days. This warranty may be limited and may not cover all parts of the generator.
For more information about the warranty of Predator generators, please consult Predator's warranty policies stated in the user manual (opens in a new tab). Alternatively, you can also contact their Customer Support : 1-800-444-3353.

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 sizer.
ItemRunning WattsStarting Watts
At homeDish washer15003000
Refrigerator (energy star)1921192
Slow cooker270270
Cell phone charger2020
Total1982 W3482 W
For campingRV AC (11,000 BTU)10101600
RV refrigerator180600
Toaster oven800800
Total2390 W2980 W
For workGrinder14002500
Reciprocating saw730960
Electric fence (25 miles)250250
Total2380 W3480 W
Does the inverter charge the battery? (Asked April 10, 2020)

The unit will charge its own battery, while running.

Does the Predator 3500 have GPS tracking (Asked September 18, 2020)

The unit does not have such a feature.

are there remote starter kits available for model 63584 3500 watt portable inverter generator (Asked November 27, 2020)

There are no official remote start kits for this unit. However, you may find third-party ones.

Up to what altitude can the predator 3500 run (Asked February 26, 2021)

You'll probably need to rejet the unit above 5000 feet. Learn more on operating portable generators in high altitudes.

How many running hours before oil change is needed on the predator 3500 inverter (Asked April 10, 2021)

Oil shoud be changed once the breaking-in period is complete, then every 6 months or 100 hours of use, whichever comes first. Oil level should also be checked before each use. You may want to refer to the maintenance schedule located page 16 of the owner's manual (opens in a new tab).

How do I clean the air filter on the predator 3500 inverter (Asked April 10, 2021)

For “paper” filter elements: In a well-ventilated area away from bystanders, use pressurized air to blow dust out of the air filter. Wear protective equipment to prevent injury from dust and debris.
For foam filter elements: Wash the element in warm water and mild detergent several times. Rinse. Squeeze out excess water and allow it to dry completely. Soak the filter in lightweight oil briefly, then squeeze out the excess oil.

Does it have a fuel injection (Asked May 13, 2021)

The unit is carbureted.

What is the difference between models 63584, 56720, and 59137? (Asked March 14, 2022)

59137 is the newer model, which includes a CO sensor. 56720 is the previous model, which improved on the 63584 by including a fuel gauge.

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

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Predator 3500
7 Total Score
7 reviews
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7 Reviews
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  1. 0.5

    Costs too much. Weighs too much. Needle valve sticks. Don’t know if it’s compatible to charge Tesla Model 3. It is not dual fuel. No weatherproof housing option.

    + PROS:
    • none
    - CONS:
    • Too expensive.
    • Too heavy.
    • Not dual fuel.
    • No weatherproof housing option.
    • Carb needle valve sticks.
    Helpful(0) Unhelpful(48)You have already voted this
  2. 4

    Predator 3500 has been a great solution for me for 4 years of camping and home emergency use. I run it monthly and use stabil in the gas. I added the remote start option which is nice to start it up for morning coffee before having to go outside. It powers 2 AC units in my RV with Soft Start RV installed.

    + PROS:
    • Size and weight, quiet and affordable, if you maintain it and run monthly, it is extremely reliable. Many support groups and parts are easily available.
    - CONS:
    • Fuel efficiency, remote start not included, spark plug it comes with is weak, fuel tank can only be filled to 80%.
    Helpful(10) Unhelpful(1)You have already voted this
  3. 4.15

    This thing is an excellent generator for emergency or camping. Because it is so (relatively) quiet. When running an adequate load, think quieter than a lawnmower and louder than a box fan. The readout is simple to understand and the push start is excellent (also has a pull start if you need it). As many online forums mention, it’s recommended to run on ethanol-free fuel, change the oil after the first hour of use (to remove lose debris from engine), and get a magnet oil-cap to help remove shards of metal (best practice for any generator). You won’t find a better value on an inverter.

    + PROS:
    • Inexpensive compared to similar inverter generators.
    • Because it’s an inverter it can safely charge an electric vehicle (slowly)
    • Quiet
    • Light weight (for output capacity).
    • Plenty of available modifications (remote start, natural gas/propane adapter)
    - CONS:
    • The wheels are hard plastic, very small. Makes moving it anywhere a bit awkward.
    • No external fuel gauge.
    Helpful(8) Unhelpful(2)You have already voted this
  4. 5

    This is my first dry camping generator Purchased in late 2018. This Predator inverter generator has been great. It has started every time via starting switch or pull start. I have ran 92 octane fuel in it and so far haven’t had any issues with not running it for a month to 4 months. Longest stretch not running is between mid November and the end of March. I am very happy with this product and will be installing a tri fuel kit soon.

    + PROS:
    • Price was outstanding
    • It's very quiet
    • Fits inside trailer door when hauling (Not Too Wide)
    • Battery and Pull start both work well
    • Out performed expectations for a Harbor freight item
    • It has handled everything i have asked it to do while dry camping.
    - CONS:
    • Wheels
    • No Low fuel indicator
    Helpful(4) Unhelpful(1)You have already voted this
  5. 5

    This is the first generator I’ve ever bought or used frequently so I don’t know to much about the longevity of these machines but I have to say this little monster is a workhorse! We use it every day, all day long, and sometimes day and night for weeks straight! I currently have 4951 hours of run time on it so far and I don’t know if that’s high for this generator or not but I’m impressed! It is starting to show wear. But I’ll buy another one just like it!

    + PROS:
    • Great price
    • Reliable work horse
    • Fairly quiet
    • Long lasting
    - CONS:
    • Used pull start 2 times and the cord broke
    Helpful(2) Unhelpful(2)You have already voted this
  6. Avatar
    Kevin Amundsen July 11, 2021 at 1:29 pm

    Bought this 4 years ago and it has 200 hours on it. Runs a 30 amp camper when the power goes out, which is rather often, needed it 2 days ago and a week before that. Twist lock receptacle, which is a must-have. Very quiet when lightly loaded but noisier at half load. Fuel efficiency is very low. Uses a whole gallon of gas to heat 10 gallons of hot water, I’ve done this at least 50 times. No way to check the fuel level without removing both the cap and strainer, you get gas on your fingers and it runs dry occasionally. Never had a problem but the engine runs rich. The exhaust stinks of unburned fuel, for this reason I would not buy another. But it was low cost and has been trouble-free. Oil change is relatively easy. Still using it, but purchased a Champion propane generator which is totally safe to store indoors because there is no gasoline in it. This one must live outdoors in the shed.

    + PROS:
    • Has been 100% reliable
    • Quiet
    • Rolls easily across hard surfaces
    • Twist-Lock Receptacle
    - CONS:
    • High fuel consumption
    • Exhaust smells of unburned fuel
    • No fuel gauge
    Helpful(1) Unhelpful(1)You have already voted this
  7. 1.75

    Bought this back in November 2020 for the home IF we needed it. Ran fine and was quiet. Shut off and put away. Started / shut it over every 2-3 weeks, running it for 10 minutes or more while using ON/OFF and table grinder. Fast forward to August 2021. Go to start as usual. It WILL NOT START. Checked all the usual stuff – Gas in tank, drained gas from carb to check for bad gas, checked for spark. Still won’t start. Decided to check the carb. Looked OK. Cleaned anyway. Same thing. I did purchase the protection plan when I bought it, so back it went. I got a no hassle swap for a new one, which I don’t plan on opening and will end up selling. While I was impressed when I first got it. my trust in it when I truly may need it is damaged. Up for sale it goes. Looking to buy a Honda for peace of mind. Won’t have all the bells and whistles this one does but I am OK with that. I want reliability.

    + PROS:
    • Nice looking with many features.
    - CONS:
    • Failed for no reason with little use after 10 months. Less than 15 hours on it . New unit given to replace this to be sold soon.
    Helpful(2) Unhelpful(3)You have already voted this

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