Predator 4550 - 3650/4550W Open Frame Inverter Generator

The Predator 4550 (59189) is a portable open frame inverter generator with a rated wattage of 3,650 W and a starting wattage of 4,550 W.

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Even though the pictures on this product page show wheels, Predator generators sold at Harbor Freight do not come with a wheel kit. It must be purchased separately.
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Zoom on the Predator 4550

In a nutshell, the Predator 4550 is a portable inverter generator mostly geared towards:

  • RV travellers looking for even more independence
  • People occasionally participating in outdoor fairs, festivals or events
  • Homeowners in need of an emergency backup power for their essentials
  • Camping and tailgating buffs looking to enhance their experience
  • Professionals in need of safely powering high-intensity work or lighting equipment

In the following paragraphs, we shall explore the power characteristics, available outlets, portability, and any additional features of the device, along with its emission compliance information.

Power & Run Time

The Predator 4550 in use

The Predator 4550

The Predator 4550 houses a 223 cc (6.5 hp) OHV 4-stroke engine, which provides 120V, consumes gasoline and delivers a running wattage of 3,650W along with a peak wattage of 4,550W. Additionally, as the generator is parallel capable (parallel kit not included), it can be linked to a second unit for more power.

With a noise rating of 64.6 dBA (just slightly more noisy than an office), the inverter generator features a conventional pull-start mechanism.

The fuel capacity of 3.72 gallons allows the 4550 to operate for up to 16.1 hours with a full tank (fuel consumption around 0.23 GPH).

As the 4550 produces a clean sine wave, with a <5% Total Harmonic Distortion (THD), sensitive electronics may be plugged in the AC outlets safely.


The control panel provides the upcoming 5 AC outlets:

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

It also sports 2 DC outlets: there's two 5V USB ports (USB-A) with which you may charge electronics, for example mobile phones or tablets, conveniently.

This Predator generator features an L5-30R receptacle, enabling an easy RV connection via an L5-30P to TT-30R adaptor (included). However, it is still not quite RV ready.


The conventional, open frame design of the Predator 4550 offers stability and allows the generator to be raised above ground level. The design is ideal for rough environments and demanding outdoor use.

The 77 lbs of the 4550's dry weight enables you to use it anywhere you will ever need. Moreover, grabbing and moving this product is made even easier by its open frame design.

The official wheel kit (opens in a new tab) can be bought separately, if you need additional help in transporting this unit.


Panel of the Predator 4550

The 4550's control panel

Several light indicators serve to show you when the oil level is too low, the generator is ready and the generator is overloaded.

The fuel level of the inverter generator can be determined quickly, easily, and conveniently with the help of its built-in fuel gauge.

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.

Along the basic documentation and an owner's manual (opens in a new tab), useful for starting the generator right away, the Predator 4550's package also includes these accessories: funnel, tool kit and RV adapter.


The Predator 4550 is EPA-approved and CARB-compliant. Therefore, its sale and purchase are permitted in all of the 50 states, including California.

Moreover, it features a spark arrestor and therefore, can be used in forested areas.

The unit also meets the ANSI/PGMA G300-2018 safety and performance requirements.

Product Videos

The Predator 4550 versus other generators

The following charts are provided to give you an idea of how some of the key specs of the Predator 4550 compare to inverter generators of similar power (between 3500 and 4500 W).

  • Regarding its weight, the Predator 4550 only weighs in at 77 pounds, which means it's one of the lighter inverter generators in the 3500-4500 rated wattage range. If weight matters to you, one of the champions in this power range is the Genmax GM4600iAEFIC with only 58.4 pounds.
  • When compared to devices able to produce a similar running wattage, this inverter generator and its lowest emitted noise of 64.6 dBA is on the noisier side. If noise emissions are important to you, one of the least noisy generators of this power range is the Westinghouse iGen4500DF with only 52 dBA.
  • Given that the 4550 reaches an autonomy of up to 16.1 hours with a full tank and at 25% load, it is placed within the average autonomy range of similarly powerful inverter generators. If autonomy is your priority, one of the devices of a similar power output with the highest run time is the Firman W03661OF, reaching up to 25 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 inverter generator is somewhat less fuel efficient than devices of comparable output: its estimated fuel consumption reaches 0.23 GPH at a 25% load. If you wish to further improve in the area of fuel efficiency, the Champion 200988, which boasts with a gas consumption of only 0.16 GPH, may be the right generator for you.

Here's a list of the most popular specific comparisons:

Price comparison

As you can see from these interactive charts, when compared to other 3500-4500W inverter generators, the Predator 4550 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

  • Inexpensive
  • CO SECURE™ technology
  • Several accessories included
  • GFCI Outlets
  • RV adapter included
  • Parallel capable
  • Inverter
  • Lightweight for its kind (77 lbs)
  • Decent run time
  • No data center
  • Weak warranty
  • On the noisy side (64.6 dBA)
  • Low fuel efficiency

Do you own the Predator 4550 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
Engine223 cc OHV 4-stroke
Starting systemRecoil
Warranty90 days
VoltageAC: 120V 60 Hz, DC: 5V
Running watts3,650 W
Starting watts4,550 W
Running amps30.4 amps
Peak amps37.9 amps
Run time @50% loadUnknown
Run time @25% load16.1 h
GFCI outletsYes
Covered outletsYes
Automatic Voltage RegulationInverter
AC outlets
  • 2x Duplex 120V 20A (5-20R) GFCI
  • 1x 120V 30A (L5-30R)
DC outlets2x 5V USB port (USB-A)
Data centerNo
IndicatorsLow oil, overload and output ready
Fuel tank3.72 gal
Fuel gaugeYes
Weight77 lbs
Approx. dimensions (L x W x H)Unknown
Noise (lower limit)64.6 dBA
THD< 5%
ComplianceCARB, EPA, ANSI/PGMA G300-2018
SecurityLow oil and overload protection, CO monitoring
Spark arrestorYes
NeutralBonded to frame
Accessories includedFunnel, tool kit, and RV adapter
Other model numbers59189

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.

Spec Improvement×

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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 4550 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 Harbor Freight'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 sizing calculator.
ItemRunning WattsStarting Watts
At homeRefrigerator (energy star)1921192
Hair dryer18001900
Washing machine9001650
Cell phone charger2020
Total2912 W3912 W
For campingRadiant heater13001300
RV refrigerator180600
RV AC (11,000 BTU)10101600
Cell phone charger2020
Total2910 W3500 W
For workTable saw18004500
Total1800 W4500 W

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Predator 4550
7 Total Score
6 reviews
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User Reviews

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  1. 4.4

    Review is accurate I would say more or less a fair review. I’ve owned this inverter generator since around January of the beginning of this year. As foolish as this is going to sound I actually own 3 inverter generators.

    In January I decided to buy the predator 4550 while at harbor freight with my step father. Brought it home put gas and oil in it 2 pulls started up runs great. I was new to the whole generator wattage world so I didn’t quit understand what to me did not sound like a lot was actually more than enough than I needed at the time which prevented me from listening to my stepfather and buying the champion 2000/1750 portable inverter(the back one from tractor supply) like he suggested in the beginning.

    A month after buying the predator I was at tractor supply long story short I ended up going home with said 2000w champion. Then decided I needed one for all and all for one last real inverter to have as a stationary back up once my generator building is finished(building a cabin). That led to me purchasing a champion 8750/7000w open frame digital hybrid inverter. I can say after extensive use for the entire year alternating amongst mainly the predator and 2000w champion don’t let people steer you away from predators they are real deal. I installed a hour meter on mine like the review said it doesn’t have one which in inconvenient wrong keep track if maintenance and run time and the champion 2000w received one as well the 8750 has the bells and whistles(electric start/pull start,intelligauge,favorite feature champion does the oil drain hose).

    Now that I’ve wired up a inlet box into my panel box from outside to inside and purchased predators 30amp rv Cord (L14-30r aka 4 prong ) and then buying a 3 prong to L14-30r adapter I’m able to plug the predator in using it’s 30 amp twist lock when I use the cord without the adapter with my big champion I’m able to produce 240v. I do oil changes religiously because I’m still working on getting my power so my electricity is coming from my solar and my generators primarily the 4550 and the 2000 the 8750 doesn’t get used. I run it on occasion just to keep it charged but that’s a real gas burner and I have no need for 240 at the moment so it’s just wasting money to fire ol Bertha up.

    Everything stated in the article is pretty accurate but I promise you predator is no joke and if you take care of it it’s going to run forever. I highly recommend both brands I spoke of predator and champion. I do like champion more simply because their warranty is much better customer service is better parts are available if needed and they are reputable the a proven track record.

    One piece of advice buy whatever plugs you use and change out the bunk ass torchF6rtc plugs that come in both predator and champion although the 2000w champion has a different torch a smaller plug. My predator I run NGKBR6ES and then that small one I run a NGKBP6HS world of difference and I purchased magnetic oil plugs also recommend those first oil check tells you why you want one.

    Good luck with whatever you choose just do your research and remember if you take care of it, it’s going to take care of you 90% of the time and also remember at harbor freight if you buy their extended warranty at anytime throughout the course of its life you decide you want a new one or a bigger one you can take yours in and because you purchased that extended service plan most say no too you can put your used one toward your new one and “trade up” as harbor calls it. A lot of people don’t realize that’s a option. Stay safe

    + PROS:
    • Reliable with decent amount of power for the type of load it is designed for. Also remember is an inverter generator so you are able to buy the parallel kit and you can plug into another compatible predator for double the power.
    - CONS:
    • Like stated could be either A) better on fuel,B) quieted down a little more or C) come with the wheel kit because it didn’t when I got mine that was another 50 dollars and another 50 on the 30 amp cord. A damn near $700 unit should at least come with a Wheel kit but that just goes to show you they can charge these prices because people are paying and are satisfied. I’d like to clarify too these are my complaints not negatives of the unit I rate the predator 4550 on a owner it for almost 8.5 months used basically daily or damn near a solid 8 out of 10 to give a perspective my champion 2000w easily a 10/10 and my champion 8750 9/10
    Helpful(1) Unhelpful(0)You have already voted this
  2. 5

    I live in Florida and use mine about 6 hours a day on average and many times I have to start and stop to travel to the next customer. I have had no issues with it starting when it is hot outside or restarting when the generator is hot which was an issue with the 3500W. I am getting an AC and am excited to see how it does.

    + PROS:
    • Restarts with no issues when the generator is hot or if it is hot outside
    • Price point
    • Not loud
    - CONS:
    • Wish it had DIGITAL DISPLAY to monitor output, frequency and runtime like the 3500W
    Helpful(1) Unhelpful(0)You have already voted this
  3. 5

    I’ve had the Predator 4550 for over a year now. I still consider this unit quiet. I use it for boondock camping.
    The generator is easy to service, Very Powerful and I love the fuel capacity. The pull start is very easy, with the choke pulled the unit fires with one or two pulls. I also like the run time.

    I previously owned a predator 3500 which was less noisy. That is a great unit as well. I compared the two units and ended up selling my 3500.

    With my 4550 it was nearly a 30 amp constant work load (29.8). Basically I can run more things in my trailer at once compared to my 3500. Biggest plus is the larger fuel tank. I can fit nearly 4 gallons if i fill it to the rim.

    I love the longer run times and less weight. I am totally satisfied with the predator 4550! The price isnt bad either.

    + PROS:
    • Nearly 30 amp working load output
    • gas tank capacity
    • 77lbs
    • 30 amp twist lock outlet
    • 4-20 amp GFC standard outlets
    - CONS:
    • none
    Helpful(1) Unhelpful(0)You have already voted this
  4. 1.9

    After buying and assembling the unit (4550) complete with wheels I started it and ran for an hour or so with no difficulty. A few weeks later I attempted to start it again and failed. I read all directions completely but still no luck. About two weeks later I did start and again it ran well for a while. Now that winter has arrived I thought I should give it another trial run. No luck. The damn thing would not start. Calling the company didn’t help a bit. I purchased from Harbor Freight and they are no help. PLEASE DO NOT PURCHASE A PREDATOR 4550 GENERATOR. It has caused me only grief and I haven’t even used it other than those two trials.

    + PROS:
    • decent price I think
    - CONS:
    • read and weep
    Helpful(1) Unhelpful(4)You have already voted this
  5. 3.65

    I’m really an anti-China consumer; but, there is nothing else available to date. I bought the Predator 4550 as a an interim solution. I’ll just have to wait for Honda to fill the gaps in this Amperage range. Pros: This Predator model has; a great price point, is moderately quiet, and easy to start. It simultaneously runs my 15000BTU AC, 1500W convection/micro, and coffee pot. Cons: It’s China and the longevity is up for grabs, no hour meter, no oil filter, and you have to purchase the weel kit extra.

    + PROS:
    • Pricepoint, nationwide repair network, moderately quiet, works as specified
    - CONS:
    • Chinese, no hour meter, no oil filter.
    Helpful(7) Unhelpful(0)You have already voted this
  6. Avatar
    Derrick Durocher March 24, 2022 at 12:05 pm

    Max amps are 23 amps and will not start a 15K RV A/C. Exchanged for a welder so not to pay the 20% restocking fee.

    + PROS:
    • Cheap
    - CONS:
    • Not enough starting amps
    Helpful(0) Unhelpful(14)You have already voted this

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