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Yamaha EF1000iS Spec Review

The Yamaha EF1000iS is a quiet, compact and lightweight portable inverter generator with a rated wattage of 900 W and a starting wattage of 1000 W.

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Description

SMALL BUT MIGHTY. Quiet, fuel efficient, and power clean enough to run sensitive electronic equipment all in a portable 28‑lb package. (source: Yamaha (opens in a new tab))

Zoom on the Yamaha EF1000iS

In summary, the Yamaha EF1000iS is a quiet, compact and lightweight portable inverter generator especially useful for:

  • Camping and tailgating hobbyists looking for a portable power source
  • DIYers who wish to improve their efficiency with tools

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 Yamaha EF1000iS's build contains a gasoline-fueled 50 cc Yamaha MZ50 OHV 4-stroke engine. With a 120V output, it gives a running wattage of 900W and also a peak wattage of 1000W.

At a noise rating of 47 dBA (less noisy than bird calls), the inverter generator offers the possibility to start the device via a simple traditional pull-start mechanism.

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 0.66 gallon, the EF1000iS can operate for up to 11.9 hours with a full tank (fuel consumption around 0.06 GPH).

The EF1000iS generates a clean sine wave: providing <2.5% Total Harmonic Disruption (THD), delicate electronics can be plugged in its AC outlets safely.

Outlets

The control panel provides the upcoming 2 AC outlets:

Duplex 120V 15A (5-15R)

It also sports 1 DC outlet: there's a 12V 8A receptacle with which charging your batteries is made easy.

Portability

As the Yamaha EF1000iS is an inverter generator, its encased design (L17.7 x W9.4 x H14.9 in) offers more aesthetics than a conventional, open frame product. This type of design is the most modern and convenient way to recreationally generate power.

Labeled a lightweight portable generator, the EF1000iS weighs just 27.9 lbs. The product’s power can be enjoyed on-the-go, as it can be moved by a single person without trouble. A handle (molded in the case) allows you to carry it easily, further enhancing its convenience.

Features

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

Security-wise, this product benefits from an overload protection (circuit breaker) and an automatic low oil shut-off (Oil Watch system), which gives you a complete peace of mind when using it.

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.

Along with the aforementioned features, from an accessory standpoint, the Yamaha EF1000iS's box includes the typical documentation and an owner's manual (opens in a new tab), which will help you start your generator promptly.

Emissions

The Yamaha EF1000iS 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 Videos

The Yamaha EF1000iS versus other generators

The following charts are provided to give you an idea of how some of the key specs of the Yamaha EF1000iS compare to generators of similar power (between 500 and 1500 W).

  • As far as its dry weight is concerned, the Yamaha EF1000iS weighs just 27.9 pounds and thus, it is one of the lighter 500 to 1500 rated wattage generators. In terms of weight, one of the champions in their power range is the Sportsman GEN1000i, standing at just 20.3 lbs.
  • With a lowest noise rating of 47 dBA, the inverter generator is one of the more quiet of the generators of similar power. If you are concerned with noise, check out the Honda EU1000i, which is one of the least noisy generators in its power range, with a noise rating of just 42 dBA.
  • The EF1000iS provides a higher run time than similarly powerful devices, reaching up to 11.9 hours at 25% load.
  • 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 one of the more fuel efficient models of the aforementioned output range, as its estimated fuel consumption reaches just 0.06 GPH (gallon per hour) at 25% load.
According to our stats, the following comparison is pretty popular: Yamaha EF1000iS vs Honda EU1000i.

Price comparison

As you can see from this interactive chart, when compared to other 500-1500W generators, the Yamaha EF1000iS 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:
  • Inverter
  • Lightweight (27.9 lbs)
  • Quiet for its power (47 dBA)
  • High run time
  • Fuel efficient
WEAKNESSES:
  • On the expensive side
  • No data center
  • No electric start

Do you own the Yamaha EF1000iS 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
Engine50 cc Yamaha MZ50 OHV 4-stroke
Starting systemRecoil

Power

VoltageAC: 120V 60 Hz, DC: 12V
Running watts900 W
Starting watts1000 W
Running amps7.5 amps
Peaks amps8.3 amps
Run time @50% loadN/A
Run time @25% load11.9 h

Features

GFCI outletsNo
Covered outletsNo
Automatic Voltage RegulationInverter
AC outlets1x Duplex 120V 15A (5-15R)
DC outlets1x 12V 8A
Data centerNo
IndicatorsLow oil, overload and output ready
Fuel tank0.66 gal
Fuel gaugeNo

Misc

Weight27.9 lbs
Dimensions (L x W x H)17.7 x 9.4 x 14.9 in
Noise (lower limit)47 dBA
THD< 2.5%
EmissionsCARB, EPA
SecurityLow oil and overload protection
Spark arrestorYes
NeutralFloating
Accessories includedNo
Warranty3 years

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.

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 EF1000iS 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.

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