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Yamaha EF1000iS Spec Review

Picture of the Yamaha EF1000iS

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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Price History
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Price history for the Yamaha EF1000iS
Latest updates:
  • $780.19 - October 19, 2019
  • $829.99 - October 15, 2019
  • $780.19 - August 24, 2019
  • $788.49 - August 17, 2019
  • $759.99 - August 13, 2019
  • $737.19 - August 7, 2019
  • $759.99 - July 31, 2019
  • $714.39 - July 28, 2019
Since: May 31, 2019
  • Highest Price: $829.99 - October 15, 2019
  • Lowest Price: $714.39 - July 28, 2019

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)

Zoom on the Yamaha EF1000iS

In a nutshell, the Yamaha EF1000iS is a quiet, compact and lightweight portable inverter generator mostly geared towards:

  • Camping and tailgating buffs looking to enhance their experience
  • Amateur DIY lovers

The following sections will present you in detail its power characteristics, the different outlets it offers, its overall portability, the extra features it benefits from and any relevant emission compliance details.

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.

With a noise rating of 47 dBA (less noisy than bird calls), the inverter generator features a conventional 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.

The EF1000iS can operate for up to 11.9 hours with a full tank (fuel consumption around 0.06 GPH), due to its fuel capacity of 0.66 gallon.

The EF1000iS produces a clean sine wave: thanks to a <2.5% Total Harmonic Disruption (THD), your sensitive electronics can be safely plugged in the AC outlets.

Outlets

The control panel provides the upcoming 2 AC outlets:

Duplex 120V 15A (5-15R)

Additionally, it features 1 DC outlet: there's a 12V 8A receptacle with which you may charge your batteries with ease.

Portability

The Yamaha EF1000iS is an inverter generator and has an encased design of the following dimensions: L17.7 x W9.4 x H14.9 in. Thus, it is more aesthetical than conventional, open frame products. The featured design follows the latest trends and is ideal for easy and recreational use.

Weighing just 27.9 lbs, the EF1000iS can be considered a lightweight portable generator. 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 generator is ready, the generator is on overload and its oil levels are insufficient.

Security-wise, this product benefits from an automatic low oil shut-off (Oil Watch system) and an overload protection (circuit breaker), 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 a user manual, which will help you start your generator promptly.

Emissions

The Yamaha EF1000iS 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 and therefore, can be used in forested areas.

Product Videos

Video of the Yamaha EF1000iS

Video of the Yamaha EF1000iS

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. If weight is your top priority, one of the champions in this power category is the Sportsman GEN1000i, weighing just 20.3 pounds.
  • At a lowest noise rating of 47 dBA, this inverter generator is one of the quieter devices of similar power. If you’d prefer a less noisy device, one of the most quiet devices, which share the same power range with this one, is the Honda EU1000i, whose lowest noise levels reach just 42 dBA.
  • With a run time of up to 11.9 hours at 25% load, the EF1000iS has one of the higher run times, compared to its similarly powerful peers.
  • 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 can be considered as fuel efficient, due to its low estimated fuel consumption of only 0.06 GPH (gallon per hour) at 25% load, within the aforementioned wattage range.
According to our stats, the following comparison is pretty popular: Yamaha EF1000iS vs Honda EU1000i.

Price comparison

As you can see from this dynamic 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 RegulationNo
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. Alternatively, you can also contact their Customer Support: 1-800-962-7926.

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