Predator 4550 - 3650/4550W Open Frame Inverter Generator

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Predator 4550Predator 4550Predator 4550
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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Price History
Price history for the Predator 4550
Latest updates:
  • $679.99 - November 18, 2023
  • $699.99 - September 8, 2023
Data source: harborfreight.com
Since: September 8, 2023
  • Highest Price: $699.99 - September 8, 2023
  • Lowest Price: $679.99 - November 18, 2023


Zoom on the Predator 4550

In summary, the Predator 4550 is a portable inverter generator especially useful for:

  • RV travellers looking for even more independence
  • Occasional participants of outdoor events, competitions, concerts and festivals
  • Homeowners in need of an emergency backup power for their essentials
  • Tailgating and campground aficionados with the desire of enjoying power anywhere they go
  • Professionals who want to ensure that a power failure will not prevent them from working

The subsequent sections will explore in detail its power characteristics, the diverse outlets it provides, its overall portability, and the supplementary features it offers.

Power & Run Time

The Predator 4550 in use

The Predator 4550

The Predator 4550 is powered by a 223 cc (6.5 hp) OHV 4-stroke engine. It delivers 120V, runs on gasoline and offers a running wattage of 3,650W as well as a peak wattage of 4,550W. Moreover, since it is parallel capable (parallel kit not included), its power may be increased if linked to a second compatible unit.

With a noise rating of 64.6 dBA (just slightly more noisy than background music), the inverter generator's ignition is facilitated by a conventional pull-start mechanism.

With a full tank, the 4550 can operate for up to 16.1 hours (fuel consumption around 0.23 GPH), thanks to its fuel capacity of 3.72 gallons.

The 4550 ensures a clean sine wave output, boasting <5% Total Harmonic Distortion (THD) to protect your sensitive electronics when connected to its AC outlets.


The control panel includes the following 5 AC outlets:

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

Moreover, it presents 2 DC outlets: there's two 5V USB ports (USB-A) enabling convenient charging of devices like mobile phones and tablets.

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 standard open frame design of the Predator 4550 provides stability and easy maintenance access to components, as well as good air circulation. The featured design is ideal for the outdoors and all tough environments.

The 4550's dry weight of 77 lbs lets you use its power anywhere needed. Additionally, the generator’s mobility is enhanced by its open frame design, as it can be easily grabbed and shifted.


Panel of the Predator 4550

The 4550's control panel

When the generator is on overload, its oil levels are insufficient and the generator is ready, you will be informed by the featured light indicators.

The inverter generator includes a built-in fuel gauge, a quick, easy and convenient method of checking the device’s gas level.

From a security standpoint, the generator is furnished with an automatic low oil shut-off and an overload protection (circuit breaker), ensuring peace of mind during operation.

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.

Beyond the standard documentation and an owner's manual (opens in a new tab) to assist with setup, the Predator 4550 ships with supplementary accessories: tool kit, funnel and RV adapter.

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).

  • Considering its weight, the Predator 4550 registers at a modest 77 pounds, placing it among the lighter inverter generators in the 3500 to 4500 rated wattage selection. 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 other units producing a similar running wattage, this inverter generator and its lowest emitted noise of 64.6 dBA stand out for being on the louder side. If you wish to prioritize minimal noise, the Westinghouse iGen4500DF stands out as one of the quietest options among generators of similar power, with a rating of 52 dBA.
  • At a 25% load, the 4550's up to 16.1 hours of runtime on a full tank fall within the average autonomy range for similarly powerful inverter generators. If runtime is a priority for you, the Firman W03661OF stands out as one of the generators with the longest run time in its power range, providing up to 25 hours of continuous use.
  • While run time matters, it's heavily influenced by the fuel tank's capacity. Hence, it's important to consider fuel efficiency alongside. Compared to its peers, this inverter generator is not exactly fuel-efficient, compared to similarly powerful devices, with an estimated fuel consumption of 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.

Price comparison

As you can see from these interactive charts, when compared to other 3500-4500W inverter generators, the Predator 4550 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
  • 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 homeAC (10,000 BTU)15002200
Refrigerator (energy star)1921192
Vacuum cleaner10751175
Game console150150
Total2917 W3917 W
For campingRV AC (11,000 BTU)10101600
RV refrigerator180600
Electric grill16501650
Set of 5 LED light bulbs5555
Cell phone charger2020
Total2915 W3505 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(3) 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(2) 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(15)You have already voted this

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