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 summary, the Yamaha EF4500iSE is a quiet portable inverter generator especially useful for:

  • RV travellers looking for even more independence
  • People occasionally participating in outdoor fairs, festivals or events
  • Homeowners who want to be sure of their ability to power their fridges, cooking tools, heating and lighting equipment during power failures
  • Tailgating and campground aficionados with the desire of enjoying power anywhere they go

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.

The inverter generator is rated for a noise of 58 dBA (less noisy than rainfall). Its starting mechanism is based on 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.

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

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

While this Yamaha generator is not RV Ready, its L5-30R receptacle can be used for a simple RV connection with an L5-30P to TT-30R adaptor.

Portability

Thanks to its closed inverter generator design (L30.7 x W24.3 x H27.2 in), the Yamaha EF4500iSE, is more esthetical than a typical, open frame generator. This modern design aims to provide an ideal power solution to recreational users.

Even though this device may be technically portable (as in movable), manipulation and transportation without special equipment can be a challenge, as it weighs 209 pounds. 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.

Features

Panel of the Yamaha EF4500iSE

The EF4500iSE's control panel

To help you monitor the EF4500iSE's status and activity, its control panel is equipped with a digital data center, giving you information on the lifetime run hours and power output.

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

The inverter generator allows for a quick, easy and convenient assessment of its gas level, as it is equipped with a built-in fuel gauge.

As for its security measures, the device features an automatic low oil shut-off (Oil Watch system) and an overload protection (circuit breaker), 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.

Regarding its accessories, besides the aforementioned features, the Yamaha EF4500iSE's box includes the typical documentation and an owner's manual (opens in a new tab), letting you start it right off the bat. An official storage cover is available, as a separate purchase.

Emissions

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

Product Videos

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).

  • Considering its dry weight of 209 pounds, the Yamaha EF4500iSE is one of the heavier inverter generators producing between 3500 and 4500 running watts. If weight matters to you, one of the champions in this power range is the Genmax GM4600iAEFIC with only 58.4 pounds.
  • At a lowest noise rating of 58 dBA, this inverter generator is one of the quieter devices of similar type and power. If you are concerned with noise, check out the Westinghouse iGen4500DF, which is one of the least noisy generators in its power range, with a noise rating of just 52 dBA.
  • 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. Concerning the run times, one of the several devices with a comparable output, offering the highest autonomy, is the Firman W03661OF, which is able to run for up to 25 hours.
  • The run time is important, but also hugely depends on the capacity of the fuel tank and doesn't mean much if we don't talk about fuel consumption as well. This inverter generator is not fuel efficient compared to devices of similar output: its estimated fuel consumption stands at 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 these interactive charts, 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)
  • Made in Japan
WEAKNESSES:
  • On the expensive side
  • No recoil back-up
  • No remote start
  • No parallel ports
  • On the heavy side (209 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
Parallel capableNo
RV readyNo
FuelGasoline
Engine357 cc Yamaha MZ360 OHV 4-stroke
Starting systemElectric
Warranty3 years
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
Weight209 lbs
Approx. dimensions (L x W x H)30.7 x 24.3 x 27.2 in
Noise (lower limit)58 dBA
THD< 3%
ComplianceCARB, EPA
SecurityLow oil and overload protection, CO monitoring
Spark arrestorYes
NeutralFloating
Accessories includedBattery
Country of originJapan
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, many of their 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 sizer.
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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