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Yamaha EF1000iS - 900 Watt Inverter Generator

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

4.4 out of 54.4 out of 54.4 out of 54.4 out of 54.4 out of 5
14 Reviews
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  • Features
  • Specs
  • 4
    Q&A 
  • 14
    Reviews
  • Articles
  • Shipping
  • Accessories

Grade

Style
Run Watts
900
Rated Watts
Surge Watts
1,000
Starting Watts
Fuel
Engine
Need Help? Call Our Generator Experts.


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
  Model Number:EF1000IS
 Manufacturer:Yamaha
 Made in USA:No
Engine
 Brand:Yamaha
 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
 Alternator:Inverter
 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
Overview
 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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Outlets
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
Don

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?

Thanks
Mark

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
Features
5/5
Quality
5/5
Performance
4/5
Value
4/5
Overall
4.4 out of 54.4 out of 54.4 out of 54.4 out of 54.4 out of 5
Pros
Easy To Use (1)
Quiet (1)
High Quality (1)
Reliable (1)
Exceeded Expectations (1)
Cons
Durability (1)
Unreliable (1)
Expensive (1)
67% of respondents would recommend this product to a friend
14 Reviews  Sort by 
 
Mike, the Portable Generator Expert
Electric Generator Expert

Product Expert
Total Reviews
99 Reviews
Total Helpful Votes
3363 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
Was this review helpful?
386
Blythe J.
Cincinnati, OH
Most Helpful Positive Review
REVIEWED
JUL.
29
2013
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
Was this review helpful?
83
Ron V.
Bemidji, MN
Most Helpful Critical Review
REVIEWED
JAN.
31
2014
3 out of 53 out of 53 out of 53 out of 53 out of 5
Failed In Second Ice Fishing Season
While powering a TV and a single lightbulb, stopped generating, while motor continued to run. I shut down, then tried to restart, but engine is too hard to pull to start. Oil level was fine, still could not pull over with plug removed. Would estimate that it has less than 150 hours on it. Has always had an issue of surging while in use.
Pros: Easy To Use, Quiet
Cons: Unreliable, Durability
Mike, the Portable Generator Expert
Product Expert
Ron,
This Yamaha generator is covered by a 3-Year Warranty. Please contact Yamaha directly @ (800) 962-7926. They can direct you to a local service center.
more
Was this review helpful?
22
Glenn Hutchinson
REVIEWED
DEC.
16
2007
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
Was this review helpful?
190
Ken Parks
REVIEWED
NOV.
20
2007
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
Was this review helpful?
151
Patricia
Lewisburg, WV
Purchased from Electric Generators Direct
Purchased 12/19/12
Total Helpful Votes
12 Helpful Votes
REVIEWED
FEB.
01
2013
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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120
Thomas Riemer
REVIEWED
AUG.
31
2006
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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80
Gary Stockton
REVIEWED
MAR.
29
2008
4 out of 54 out of 54 out of 54 out of 54 out of 5
Yamaha Ef1000is - 900 Watt Inverter Generator Review
Very nice unit and runs as adverised, but seems loader than the Honda unit which specs at the same decibles.

Still relatively quiet and reliable. I have had it for almost a year now.
Was this review helpful?
61
Vaughn Simon
REVIEWED
JUN.
18
2006
5 out of 55 out of 55 out of 55 out of 55 out of 5
Yamaha Ef1000is - 900 Watt Inverter Generator Review
An absolutely amazing machine. This is the smallest, quietest, most gas-frugal generator you should ever consider for home standby use. Consider that the normal generator that you buy at a home improvement store is terribly loud and can drink up to one gallon an hour even with only a partial load. At $3 per gallon, that could be $500 per week! Now the EF1000is has much less capacity than those other generators, but if you are willing to live within its limitations, you will have a... more
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50
Anthony
Purchased from Electric Generators Direct
Purchased 4/8/13
Total Reviews
4 Reviews
Total Helpful Votes
35 Helpful Votes
REVIEWED
APR.
17
2013
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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51
Brad
Bayfield, CO
Purchased from Electric Generators Direct
Purchased 4/15/12
REVIEWED
JUN.
25
2012
5 out of 55 out of 55 out of 55 out of 55 out of 5
Its Works Like A Charm
The generator works very well and it is quiet after it warms up and goes into the low mode. The only complaint I have on it is that every time you start it even to fill it with fuel it runs on high and not low for 3 minutes to rewarm itself and that would be not good if there is other campers near you at night.
Was this review helpful?
51
Sven
Deming, NM
REVIEWED
FEB.
12
2013
1 out of 51 out of 51 out of 51 out of 51 out of 5
Don't Buy The 1000is
We have a fly in only camp in Northern Canada, we bought a brand new Yamaha 1000 and had it flown up, freight cost alone came to $500,
Over the years we have had Honda's, and Chinese made Inverters, all was very reliable and run for hundreds of hours.
After checking the oil, gas etc. in the Yamaha we started her, I never heard a generator run so poorly, the rpm was fluctuating from almost stopping to high. We had this generator serviced with 0 hours on it cost us $500 to fly her out plus $500... more
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85
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