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Yamaha EF4500iSE - 4000/4500W Inverter Generator

The Yamaha EF4500iSE is a quiet inverter generator with a rated wattage of 4,000 W and a starting wattage of 4,500 W.

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Description

MAXIMUM EFFICIENCY ‑ MINIMUM NOISE. The powerful engine allows this inverter to run at very low engine speed, reducing fuel consumption, noise, vibration and wear. (source: Yamaha (opens in a new tab))

Zoom on the Yamaha EF4500iSE

In a nutshell, the Yamaha EF4500iSE is a quiet portable inverter generator mostly geared towards:

  • RV travellers wishing to enhance their freedom and nomad lifestyle
  • 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

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 Yamaha EF4500iSE in use

The Yamaha EF4500iSE

The Yamaha EF4500iSE is powered by a 357 cc Yamaha MZ360 OHV 4-stroke engine. It delivers 120V, runs on gasoline and offers a running wattage of 4,000W as well as a peak wattage of 4,500W.

Enjoying a noise rating of 58 dBA (less noisy than rainfall), this inverter generator gets running thanks to a convenient and easy-to-use electric starter (battery included).

This generator features Yamaha's Smart Throttle™. This load-sensing feature automatically adjusts engine speed to match its load in order to offer greater fuel efficiency and noise reduction.

Thanks to a fuel capacity of 4.5 gallons, the EF4500iSE can operate for up to 15.2 hours with a full tank (fuel consumption around 0.3 GPH).

Delicate electronics can be plugged in an AC outlets safely, as the EF4500iSE generates a clean sine wave, reaching a <3% Total Harmonic Distortion (THD).

Outlets

The control panel provides the upcoming 3 AC outlets:

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

This Yamaha 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

As the Yamaha EF4500iSE is an inverter generator, its encased design (L30.7 x W24.3 x H27.8 in) offers more aesthetics than a conventional, open frame product. 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 194 lbs. Nevertheless, thanks to its set of 4 wheels and its double handle (a decent solution to its lack of maneuverability), the generator can be easily moved, once placed the ground.

Features

Panel of the Yamaha EF4500iSE

The EF4500iSE's control panel

The control panel of the EF4500iSE includes a digital data center, which assists you in monitoring its status and activity, as it provides information on the lifetime run hours and power output.

In addition to this info, several light indicators serve to show you when the generator is ready, the generator is on overload and the oil level is too low.

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

As for its security measures, the device features an overload protection (circuit breaker) and an automatic low oil shut-off (Oil Watch system), letting you use it with a peace of mind.

Yamaha's Oil Watch warning system gives you an extra peace of mind. This feature enhances long-term durability by preventing engine damage and costly repairs. Once the oil begins to run low, the generator automatically shuts off and cannot be re-started until oil is added.

It also includes a carbon monoxide sensor. This sensor is designed to monitor the level of carbon monoxide present during the generator's operation. If the generator is positioned incorrectly and carbon monoxide levels rise to an unsafe level, the generator will automatically shut down. It’s a welcomed additional security feature, but don’t forget to always take your generator outside (opens in a new tab).

As for its accessories, apart from the previously mentioned features, the Yamaha EF4500iSE also comes with the basic documentation and an owner's manual (opens in a new tab), allowing you to start it right away. An official storage cover is available, as a separate purchase.

Emissions

The Yamaha EF4500iSE 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, so it is adequate for use in forested areas.

Product Video

The Yamaha EF4500iSE versus other generators

The following charts are provided to give you an idea of how some of the key specs of the Yamaha EF4500iSE compare to inverter generators of similar power (between 3500 and 4500 W).

  • A weight of 194 lbs makes the Yamaha EF4500iSE one of the heavier inverters in the 3500-4500 rated wattage range. In terms of weight, one of the champions in their power range is the WEN GN400i, standing at just 66.1 lbs.
  • Since this inverter generator is rated for a lowest possible noise of 58 dBA, it can be considered as one of the more quiet of the products generating similar power. For those who are looking for a less noisy device, we suggest the Westinghouse iGen4500DF. With just 52 dBA, it is one of the most quiet devices in this power range.
  • Autonomy-wise, with up to 15.2 hours on a full tank at a 25% load, the EF4500iSE is on the low end when compared to other inverter generators of a similar power output. If concerned with autonomy, one of the products of a comparable power output, which offers the highest run time, is the Firman W03661OF, boasting with 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 rather wasteful, compared to other devices within the aforementioned output range, when it comes to gasoline consumption, as it reaches roughly 0.3 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 this interactive chart, when compared to other 3500-4500W inverter generators, the Yamaha EF4500iSE is on the expensive side of the price range.

While certainly not the cheapest of its kind, purchasing it would most likely also mean enjoying the reliability of a high-end product.

The bottom line

STRENGTHS:
  • CO Sensor
  • Electric start
  • Inverter
  • Quiet for its power (58 dBA)
WEAKNESSES:
  • On the expensive side
  • No recoil back-up
  • No remote start
  • No parallel ports
  • On the heavy side (194 lbs)
  • Relatively low run time
  • Low fuel efficiency

Do you own the Yamaha EF4500iSE and agree (or disagree) with these strengths and weaknesses?

Let us know and write your own review.

Features and Specifications

General
InverterYes
PortableYes
Parallel capableNo
RV readyNo
FuelGasoline
Engine357 cc Yamaha MZ360 OHV 4-stroke
Starting systemElectric
Power
VoltageAC: 120V 60 Hz
Running watts4,000 W
Starting watts4,500 W
Running amps33.3 amps
Peak amps37.5 amps
Run time @50% loadUnknown
Run time @25% load15.2 h
Features
GFCI outletsNo
Covered outletsNo
Automatic Voltage RegulationInverter
AC outlets
  • 1x Duplex 120V 20A (5-20R)
  • 1x 120V 30A (L5-30R)
DC outletsNo
Data centerPower output and lifetime run hours
IndicatorsLow oil, overload and output ready
Fuel tankPlastic, 4.5 gal
Fuel gaugeYes
Misc
Weight194 lbs
Approx. dimensions (L x W x H)30.7 x 24.3 x 27.8 in
Noise (lower limit)58 dBA
THD< 3%
ComplianceCARB, EPA
SecurityLow oil and overload protection, CO monitoring
Spark arrestorYes
NeutralFloating
Accessories includedBattery
Warranty3 years
Other model numbersEF45ISEZ
UPC765053833196

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 Yamaha

With a rich history of over 130 years, the Japanese based Yamaha Corporation, founded in 1887, has tipped its fingers in every industry imaginable, most notably motorcycles, musical instruments and electronics. The company boasts with a wide range of products, including many of the top rated portable generators. However, it has been reported that many of the newer models are made in China, rather than Japan.

Warranty Information

The Yamaha EF4500iSE 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 Yamaha generators, please consult Yamaha's warranty policies (opens in a new tab). Alternatively, you can also contact their Customer Support: 1-800-962-7926.

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
Vacuum cleaner10751175
Radio100100
Cell phone charger2020
Total3187 W4187 W
For campingRadiant heater13001300
RV refrigerator180600
Electric grill16501650
Set of 5 LED light bulbs5555
Total3185 W3605 W
For workGrinder14002500
Demolition hammer12601260
Drain cleaner250250
Electric fence (25 miles)250250
Total3160 W4260 W
Is it made in China? (Asked November 10, 2020)

The EF4500 is made in Japan.

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