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The Yamaha ef1000is - 900 watt inverter generator is available for purchase today.

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Yamaha EF1000iS - 900 Watt Inverter Generator

(Based on expert analysis, manufacturer ratings and customer reviews)

4.6 out of 54.6 out of 54.6 out of 54.6 out of 54.6 out of 5
21 Reviews
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  • Features
  • Specs
  • 4
  • 21
  • Articles
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  • Accessories


Run Watts
Rated Watts
Surge Watts
Starting Watts
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Product Video Disclaimer: "PED is not responsible for any variances from the product in this video and the item you purchase. Please review all product specs prior to purchase."

1,000 Max Rated Watts
Generator can produce 1,000 watts for up to 20 minutes
Rated at 900 watts for continuous operation over 20 minutes

Inverter Technology
Safely power computers and sensitive electronics

Extremely Lightweight (27 lbs)
Easy to take tailgating, camping, hunting, etc

Smart Throttle™
Engine speed varies based on load

Very Quiet (47-57 decibels @ 7 meters)
Power your stuff without disturbing your neighbors

12-Volt DC Output (Cables Included)
Recharge 12-volt batteries for RV, auto, marine, aircraft, etc

Exclusive Dual Coil Alternator
Lowers engine speed and wear, reduces noise, fuel consumption

Oil Not Included

  Model Number:EF1000IS
 Made in USA:No
 Starting System:Recoil Start
 HP/CC:50 cc
 Consumer Engine Warranty:3 Years
 Commercial Engine Warranty:2 Years
 Engine RPM:Inverter
 Low Oil Alert/Shutdown:Yes
 Cast Iron Sleeve:Yes
Product Specs
 Voltage120 Single-Phase
 Frequency:60 Hertz
 Auto Voltage Regulation:Yes
 Fuel TypeGasoline
 Rated Amps:8 Amps @ 120 Volts (Single Phase)
 Portability Kit:Unknown
 Tank Size:.66 Gallons
 Run Time (50% Load):8 Hours
 Fuel Tank Material:Plastic
 Fuel Gauge:No
 Decibel Rating @ 7m:47-57 db(A)
 Idle Control:Yes
 Hour Meter:No
 Voltage Meter:No
 Lifting Eye:No
 Neutral Type:Floating
 Battery:Not Applicable
 Assembly Required:No
 Weight:28 Lbs. (12.70 kilograms)
 Dimensions:17.7"L x 9.4"W x 14.9"H
(44.96 x 23.88 x 37.85 cm)
 Consumer Warranty:3 Years
 Commercial Warranty:2 Years
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10-Amp DC
NEMA 5-20R (Wall-Type)

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  4 Questions
Q: Is the Yamaha 1000is generator USFS compliant?
I want to use on forest service land.
Spark arrestor etc.?
Ditto for the 2000 model.

Thank you

by Don from Washington on October 09, 2013

A: Thank you for your inquiry....

Yes, the Yamaha inverter generators meet all USFS requirements and they all include spark arresters.

by Mike, Product Expert
Q: What does ECON stand for on the switch? While running the generator what position should if be in?


by Mark Babin from Louisiana on February 08, 2012

A: ECON stands for Economy mode and the generator will alter the engine RPM based on the load on the unit giving it a quieter output and use less fuel.

The standard running mode keeps the unit running at top RPM for heavy loads keeping the output at its highest.

by Mike, Product Expert
Q: How much oil does the Yamaha EF1000IS hold?
by Anonymous on April 21, 2011

A: The Yamaha EF1000IS holds 0.34 quart oil.
by Mike, Product Expert
Q: I am buying a Yamaha 1000is from you. If I plan to not use the generator for a period of 4 months, so I just have to use Sta-Bil in the fuel and I am fine? Or do you recommend a draining procedure between uses, or some other kind of procedure?

by Mitch Carter from California on January 24, 2011

A: We definitely recommend the use of Sta-Bil fuel stabilizer in your generator as it will keep your fuel fresh for up to 2 years. We do recommend that you start the generator once a month to lubricate the internal parts in the system and also throw a small load on it to verify good operation.
by Mike, Product Expert
Yamaha EF1000IS Reviews & Ratings
Write Review
Overall Rating
4.6 out of 54.6 out of 54.6 out of 54.6 out of 54.6 out of 5
Easy To Use (4)
Quiet (4)
Reliable (3)
Exceeded Expectations (2)
Easy To Store (2)
Durability (1)
Unreliable (1)
I Have None (1)
Expensive (1)
90% of respondents would recommend this product to a friend
21 Reviews  Sort by 
Mike, the Portable Generator Expert
Electric Generator Expert

Product Expert
Total Reviews
103 Reviews
Total Helpful Votes
6950 Helpful Votes
Electric Generators Direct Recommended

We recommended Coleman Powermate camping generators for years.

Now, those little Mega Pulse generators are equivalent to dial-up Internet service.

New Inverter technology is making the traditional camping generator obsolete. They are smaller, quieter and produce cleaner electricity. Until now, they've been expensive too.

Yamaha is one of the best units when it comes to inverter generators. Consider this little 900 watt version as the "broadband" of new camping generators.

Mike Recommends This Model
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Blythe J.
Cincinnati, OH
Total Helpful Votes
22 Helpful Votes
Most Helpful Positive Review
5 out of 55 out of 55 out of 55 out of 55 out of 5
A Lot Of Usefulness In A Compact Package
Our generator is 3 years old, and still starts easily and runs quietly. We originally bought it just to run a blender during Jimmy Buffett concert tailgates, but we've used it more than we ever thought we would.

This little guy saved our freezer full of beef during an 8 day power outage, it's run a sound system for the Flying Pig Marathon, and charges everyone's i-Everything when we go camping... as well as running a huge fan to keep us cool and comfortable.

It's a little more expensive... more
Pros: Durable, Exceeded Expectations, Reliable, High Quality
Cons: Expensive
Blythe Recommends This Yamaha Product
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Samuel B.
Orlando, FL
Purchased from Electric Generators Direct
Purchased 5/26/15
5 out of 55 out of 55 out of 55 out of 55 out of 5
Super Quiet Unit
I wanted a quiet generator to use at the race track for over-nite camping and battery charging on the car, compared this to the Honda and settled on the Yamaha, cannot believe how "SUPER QUITE" it is.
Pros: Quiet, Light Weight, Exceeded Expectations, I'd Buy It Again
Cons: I Have None
Samuel Recommends This Yamaha Product
Samuel's Experience With Electric Generators Direct
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"Easy online ordering and fast shipping."
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James B.
San Diego, CA
Purchased from Electric Generators Direct
Purchased 6/4/15
5 out of 55 out of 55 out of 55 out of 55 out of 5
Pleased With My Generator
Hi, my generator arrived on time from Generator's Direct. I put it together following the directions. It started on about the 5th pull. It runs great, it's very quiet on econ mode.

I have a sail boat. To test everything, I put on both battery chargers, a fan, some AC lights and made toast. Putting on the toaster was a big load, it switched from econ to normal mode. But everything worked and I got my toast.

Now after that first time it starts on the first or second pull every time.
James Recommends This Yamaha Product
James's Experience With Electric Generators Direct
Web Site


"I bought the unit on line, and it shipped right away and arrived on time, with no damage, and exactly as advetised. You can't ask for more."
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Michael K.
Dillon, CO
Purchased from Electric Generators Direct
Purchased 3/24/15
5 out of 55 out of 55 out of 55 out of 55 out of 5
Best Purchase Ever!
I recently purchased a Yamaha EF1000iS Generator from Electric Generators Direct.

I just used it for a week of remote camping out in the wilderness of Western Colorado. We have a pop-up trailer, and this unit provided us with a quiet & reliable power source to keep our battery sufficiently charged to run the heater/water heater, and charge our devices. We have been doing trips like this for almost ten years, and it's this first time I have been able to enjoy the benefits of owning a... more
Michael Recommends This Yamaha Product
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Melvin B.
Bogart, GA
Purchased from Electric Generators Direct
Purchased 8/30/15
5 out of 55 out of 55 out of 55 out of 55 out of 5
Quality Built
I have used only one time, on a camping trip . It ran all night right next to tent . It was running a fan . The fan made more noise than the generator. Great Product, in my opinion .
Melvin Recommends This Yamaha Product
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Glenn Hutchinson
5 out of 55 out of 55 out of 55 out of 55 out of 5
Yamaha Ef1000is - 900 Watt Inverter Generator Review
I got this generator two years ago when my wife was put on a C-PAP for her sleeping disorder. I knew her machine was computerised and we would need clean power to run it.
I first looked at the Honda 1000 watt inverter and was seriously considering it, but I decided to do a little comparing of the different brands first. I'm glad I did! The Yamaha blows the Honda out of the water, longer run time less noise, engine runs at a much slower speed and the 12 volt DC cables are included. They cost... more
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Ken Parks
5 out of 55 out of 55 out of 55 out of 55 out of 5
Yamaha Ef1000is - 900 Watt Inverter Generator Review
My Yamaha 1000i is the only one of it's type in my sailing club. Everyone else has a Honda. The Yanaha is by my follow sailing club members the LEAST noisy gernator in the club. We cruise often, and usually use generators to power AC accessories. My Yanaha uses far less fuel than the Honda's, and produces quite a bit less niose. This is especially true when the load is less than 75% of maximum. At full output, the Yamaha and Honda's are about the same noise level, with the Yamaha slightly... more
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Lewisburg, WV
Purchased from Electric Generators Direct
Purchased 12/19/12
Total Helpful Votes
20 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
So Far, Fantastic.
Running our new Yamaha EF 1000 IS generator 5 hours a day for two weeks now and it is a CHARM.

We are off grid more by default than intention. Even on grid, though, we would have a backup. Our 7000 watt generator has been great for three years of occasional demand, arranging our schedule to do everything while it was running -- construction tools, welder, washing machine and charging our house batteries along the way (which run our minimized refrigeration and house lights). It pushed... more
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Thomas Riemer
5 out of 55 out of 55 out of 55 out of 55 out of 5
Yamaha Ef1000is - 900 Watt Inverter Generator Review
I purchase my Yamaha January 2005 andicipating the upcoming hurricane season. I live in South Florida and boy I am glad I made the purchase.

This little baby ran my 32" Sharp LCD tv, cable box, dvd player, notbook computer, internet & wireless router, 1 ceiling fan and my 18 cu/ft refrigerator. All while sipping on gas.

Best yet, it is quite as a curch mouse. All my neighbors were wondering why I had power. It served me well through both Katrina and Wilma.

It can... more
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Purchased from Electric Generators Direct
Purchased 4/8/13
Total Reviews
4 Reviews
Total Helpful Votes
44 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
So Far So Good
I originally bought the Honeywell 800 watt and had lots of problems. The Yamaha seems to have much cleaner power so far and even though it is only rated at 100 watts more than the Honeywell it seems to produce more power than the Honeywell. Also much quieter. The economy mode works great where it would surge on the Honeywell. very smooth on the Yamaha. Cant comment on reliability yet because it is new but will over time. So far very impressed. You get what you pay for. 3 times the price of the... more
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Jim R.
Gaithersburg, MD
Purchased from Electric Generators Direct
Purchased 7/7/14
Total Reviews
2 Reviews
Total Helpful Votes
10 Helpful Votes
5 out of 55 out of 55 out of 55 out of 55 out of 5
It Stands Up To My Kind Of Torture
The generator started 2nd pull out of the box and starts first pull most of the time. We took it 60 miles off shore in the boat on a rough day and it performed as advertised. I have not had any problems with it and it runs good. I like the fuel shut off. When I run the gas out of the carb. it's ready for the next time we use it and starts quickly. The only dislike is the oil fill, it's very hard to get to and even being careful you are bound to have a mess on the initial fill up. It only holds... more
Pros: Easy To Use, Price, Reliable, Easy To Store
Jim Recommends This Yamaha Product
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