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Product Description
Amazon.com Product Description
Powerful, portable, and efficient, the Yamaha EF2000iS Gas-Powered Portable Inverter delivers maximum electrical output without sacrificing portability. Thanks to its innovative inverter system, the generator is able to generate up to 2,000 watts of clean AC power. It can run up to 10.5 hours continuously without refueling and uses premium technologies to maximize fuel efficiency.
Powerful Inverter System Delivers Cleaner Electricity
The EF2000iS is built around an innovative inverter system, which is able to deliver higher-quality, cleaner electricity than competing generators. It produces energy in the form of pure sine waves, which are cleaner and more reliable than most commercial power sources.
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 Compact and ergonomic, the EF2000iS is easy to store and transport. View larger. |
 TwinTech technology allows you to hook up two units for added output. View larger. |
The EF2000iS is built around an innovative inverter system, which is able to deliver higher-quality, cleaner electricity than competing generators. It produces energy in the form of pure sine waves, which are cleaner and more reliable than most commercial power sources.
In simpler terms, this means that you'll be able to confidently power delicate machinery without having to worry about the damage caused by unrefined energy. An electrical overload breaker is also included, to prevent generator damage in case of an unexpected overload.
Smart Technologies for Optimal Fuel Efficiency
The EF2000iS is exceptionally fuel efficient, able to run for up to 10.5 hours without refueling when in Economy mode. Its OHV engine runs reliably and dissipates heat efficiently, allowing for both a long life and optimal fuel consumption.
With its Smart Throttle Load feature, the generator is able to dynamically adjust engine speed depending on output, resulting in greater overall fuel efficiency. The generator also features an exclusive dual coil alternator stator, which lowers engine speed and reduces total fuel consumption.
Ergonomic, User-Friendly Design
Weighing 44 pounds, the generator is ultra-portable and features an easy-to-carry design. It has a convenient, centralized control panel, which allows you to easily access all of the generator's features at the push of a button. It also starts up responsively due to its auto-decompression system, which reduces compression and makes start-up less difficult.
For added convenience, the EF2000iS is able to recharge batteries with its 8A12V DC output, making it ideal for RV, auto, and boat owners. You can even hook up two EF2000iS units for added output, thanks to TwinTech technology. And you won't have to worry about engine damage due to low oil levels: an oil-watch warning system constantly monitors oil levels and lets you know when an oil change is needed.
Noise Reduction for Quiet Operation
The EF2000iS uses noise reduction technologies to ensure the quietest operation possible. Featuring a special sound-blocking design, the generator has noise-absorbing glass wool construction, which helps dampen noise even during heavy operation. Along with the EF2000iS' super-quiet muffler and vibration-isolating feet, it helps keep noise to a minimum.
The EF2000iS is backed by a two-year warranty.
What's in the Box
Gas-powered generator
 The EF2000iS has the EPA's longest engine emission life rating. View larger. |  The EF2000iS recharges 12-volt batteries, making it ideal for boat, RV, and auto owners. View larger. |
Product Description
<h3>Yamaha EF2000iS</h3>
Powerful, portable, and efficient, the Yamaha EF2000iS Gas-Powered Portable Inverter delivers maximum electrical output without sacrificing portability. Thanks to its innovative inverter system, the generator is able to generate up to 2,000 watts of clean AC power. It can run up to 10.5 hours continuously without refueling and uses premium technologies to maximize fuel efficiency.
The EF2000iS is backed by a three-year warranty.
Customer Reviews
Most Helpful Customer Reviews
319 of 325 people found the following review helpful
This is a very high quality unit, nicely designed. I chose it over the Honda Eu2000i because it has a fuel gage and is a hair lighter (2 pounds), and liked the styling better. Specs are so close it's a tie... the Yamaha unit specs a bit quieter in "eco" throttle but the Honda specs a bit quieter at full power. Prior to this purchase I had bought a Honeywell inverter generator (a much less expensive Chinese-made knock-off) from Costco which I returned, because I was unimpressed with the Honeywell unit's quality and noise level. While the price difference is major, you get what you pay for in this case. Anyone looking at the cheaper knock-offs should really consider that a 5db increase in noise level is a major difference, the way humans perceive it.
The most impressive thing about this unit is how quiet it is. Even at full engine speed you can stand about 6 feet away and have a normal conversation without raising your voice, or talk on a cell phone without undue distraction. It features an "eco" setting which tapers down the engine throttle and noise when full load isn't required. At half-throttle or less, from about 6 feet away it is about half as loud and amazingly quiet. I used it to run a 50-amp 12v battery charger and at full charge level the charger only required the generator to operate at about half-speed, and when the charger tapered down the charge level to under 30-amps the generator became so quiet I literally forgot about it. It is MUCH quieter than my boat's inboard diesel engine, and more efficient than running the main engine just to top off the batteries. I also used it to power a heavy duty 120v grinder and it had no problems supplying the needed power, even on electric motor start-up.
I got this mainly for charging our boat's batteries at anchor but I also wanted the ability to run power tools. The lighter 1000-watt inverter generators could easily handle the charging application but not the more power-hungry tools. Having the extra power also means the eco-throttle will likely kick in earlier and the unit will operate quieter. The number-1 purchase criteria was "quiet" because I don't want to be distracted by incessant noise or be a bad neighbor in anchorages. The Honeywell was not quiet enough in my opinion.
If generators are abused it will lead to regulations banning them, so an appeal to other boaters and to campers: Please don't settle for "cheap". Get a better quality inverter-generator unit that's quieter so you minimize noise pollution in get-away places. (Leave your "contractors generator" at home!!!) Also, please be considerate of neighbors and limit running it to times/places you aren't as likely to disturb others... and don't leave your boat or campsite while it runs and runs. We all like our electric conveniences, but if you really need 120v power more or less constantly you should either stay home or get a dock/parking space where you can plug into "the grid". It's rude to disturb others who are trying to get away to find some peace and quiet.
Negative: The unit ships without engine oil, so you need to buy a quart of standard 4-stroke engine oil and fill it. You will also need a funnel, and a pan to catch excess oil. There is no dipstick; you need to fill to the level of the bottom of the filler hole until any more runs out. It uses less than 3/4 quart. I think they should have included the required amount of oil, and a plastic filler container with a spout, marked to show the proper amount of oil to use.
Update 2/22/2012: In general still very happy with the unit, but checking oil level is inconvenient (you need to open the case with several screws) and changing the oil is a messy operation involving rags and clean-up because there is no neat way to capture the waste oil or overflow directly into a container. I think the next generation of this product should improve on that design issue and provide a dip stick or oil level indicator that's either externally accessible or located behind a quick-access panel.
Update 8/29/11:
Having owned this for almost 2 years now I would add the following:
1) I have found that it has enough power to run the charger AND the hot water heater's 120v heating element at the same time. It is near-max (running full speed) but doesn't light the overload light when doing that and the charger is in bulk phase. Nice when you're in an anchorage for a few days and haven't run the engine. Why run a 57hp diesel just to heat water and charge the house bank?
2) If I shut off the fuel and let the carburetor run dry before putting it away, it does not smell of gas with the fuel vent and fuel valve both closed. The maker advocates storing in a well ventilated area or garage, but odor from fumes is not a problem.
3) It's also useful at home during power outages. I have a larger much louder 5500w contractors generator that plugs into a 12-circuit transfer switch wired by an electrician, but as a courtesy to neighbors I shut that off overnight. I can use this Yamaha unit with an extension cord to keep just the refrigerator running overnight and it stays in 'eco mode' so it practically purrs. Also the fuel burn rate is extremely low so it uses a fraction of what the larger generator would use.
Have had zero problems with this unit so far.
The most impressive thing about this unit is how quiet it is. Even at full engine speed you can stand about 6 feet away and have a normal conversation without raising your voice, or talk on a cell phone without undue distraction. It features an "eco" setting which tapers down the engine throttle and noise when full load isn't required. At half-throttle or less, from about 6 feet away it is about half as loud and amazingly quiet. I used it to run a 50-amp 12v battery charger and at full charge level the charger only required the generator to operate at about half-speed, and when the charger tapered down the charge level to under 30-amps the generator became so quiet I literally forgot about it. It is MUCH quieter than my boat's inboard diesel engine, and more efficient than running the main engine just to top off the batteries. I also used it to power a heavy duty 120v grinder and it had no problems supplying the needed power, even on electric motor start-up.
I got this mainly for charging our boat's batteries at anchor but I also wanted the ability to run power tools. The lighter 1000-watt inverter generators could easily handle the charging application but not the more power-hungry tools. Having the extra power also means the eco-throttle will likely kick in earlier and the unit will operate quieter. The number-1 purchase criteria was "quiet" because I don't want to be distracted by incessant noise or be a bad neighbor in anchorages. The Honeywell was not quiet enough in my opinion.
If generators are abused it will lead to regulations banning them, so an appeal to other boaters and to campers: Please don't settle for "cheap". Get a better quality inverter-generator unit that's quieter so you minimize noise pollution in get-away places. (Leave your "contractors generator" at home!!!) Also, please be considerate of neighbors and limit running it to times/places you aren't as likely to disturb others... and don't leave your boat or campsite while it runs and runs. We all like our electric conveniences, but if you really need 120v power more or less constantly you should either stay home or get a dock/parking space where you can plug into "the grid". It's rude to disturb others who are trying to get away to find some peace and quiet.
Negative: The unit ships without engine oil, so you need to buy a quart of standard 4-stroke engine oil and fill it. You will also need a funnel, and a pan to catch excess oil. There is no dipstick; you need to fill to the level of the bottom of the filler hole until any more runs out. It uses less than 3/4 quart. I think they should have included the required amount of oil, and a plastic filler container with a spout, marked to show the proper amount of oil to use.
Update 2/22/2012: In general still very happy with the unit, but checking oil level is inconvenient (you need to open the case with several screws) and changing the oil is a messy operation involving rags and clean-up because there is no neat way to capture the waste oil or overflow directly into a container. I think the next generation of this product should improve on that design issue and provide a dip stick or oil level indicator that's either externally accessible or located behind a quick-access panel.
Update 8/29/11:
Having owned this for almost 2 years now I would add the following:
1) I have found that it has enough power to run the charger AND the hot water heater's 120v heating element at the same time. It is near-max (running full speed) but doesn't light the overload light when doing that and the charger is in bulk phase. Nice when you're in an anchorage for a few days and haven't run the engine. Why run a 57hp diesel just to heat water and charge the house bank?
2) If I shut off the fuel and let the carburetor run dry before putting it away, it does not smell of gas with the fuel vent and fuel valve both closed. The maker advocates storing in a well ventilated area or garage, but odor from fumes is not a problem.
3) It's also useful at home during power outages. I have a larger much louder 5500w contractors generator that plugs into a 12-circuit transfer switch wired by an electrician, but as a courtesy to neighbors I shut that off overnight. I can use this Yamaha unit with an extension cord to keep just the refrigerator running overnight and it stays in 'eco mode' so it practically purrs. Also the fuel burn rate is extremely low so it uses a fraction of what the larger generator would use.
Have had zero problems with this unit so far.
101 of 102 people found the following review helpful
Amazon Verified Purchase
I purchased the EF2000iS 2,000 watt inverter-generator for extended fishing trips for charging 12 volt marine batteries and for running corded power tools in remote areas. At first I wasn't sure if the 2,000 watt model would be enough power to meet my needs, but I decieded to take a chance with it because of the price, and boy am I glad I did.
It easily powers drills, grinders, skill saws, table saws, sawzalls, and portable cement mixers - pretty much anything that draws under 16.7 Amps. Most power tools draw up to and under 15 Amps. My industrial right-angle concrete drill only draws 8 Amps, and that thing is rugged. It's more than enough for my needs for working in the woods where I can't just "Plug In."
Another thing that's slick about it is it also charges marine batteries and has its own special DC receptical and comes with the included cable. You just fire it up, hook up the terminals to your battery, then plug in the cord. It doesn't have a charge meter built in, so I purchased a hand held battery tester and check the charge level once an hour. I think the battery tester was under $30 (a good investment).
With that in mind, I used it last Memorial Day weekend during our Men's Family Fishing Trip out at Johnston Pond camp here in Maine, out in the woods roughing it with tents. The area is surrounded with small-ish ponds, so my dad and I brought our little skiff and trolling motor with us (too small ponds for our larger, 2-stroke boat). We brought two 12 volt marine batteries with us to make sure we could spend the whole day out each day, then that evening charge one or the other up so it was ready for the next day. It worked great, we didn't have to worry about running our batteries low and having to paddle all the way back to the landing. Peace of mind is nice.
This unit really is really quiet. There were five of us on the fishing trip, two younin's - my friend and I, and three old farts - my dad, uncle, and elderly cousin. They complain about everything (old people tend to do that, haha). I figured someone was going to say something about the generator being noisey and I'd catch hell for it or something, but actually, everyone did nothing but praise how quiet it was. After it's been running for 15 minutes or so, you kind of forget that it's even there. Unlike our neighbors at a site a ways away from us, who had an old style generator that they ran at night, we could hear them having to hollar at each other in order to talk.
On top of all that goodness, since it's an Inverter as well, you can also safely power computers, charge cell phones and iPods, run a tv and DVD player, and plenty of other things, if that's what you're into while camping, or in an emergency situation.
It starts up really easy. Mine started first pull right out of the box (make sure to put oil in it first, it's not included), and still does every time. If you run it on Eco Mode (tv's, appliances, ect.) I'm not sure how long the tank will last you hour-wise, I haven't used it for that application yet, but in full power mode, meaning you're constantly getting the amped up rpms for more amperage, the one gallon tank lasts for about 6 hours or so. I'd figure that it'd almost double that in Eco mode, and it's twice as quiet. You can stand right next to it and it's like a little humm.
I give the Yamaha EF2000iS five stars hands down for the price and performance. I'm really happy I didn't go ahead and go with a knock off lesser brand. It was well worth the extra money for something that's going to be reliable and dependable. There's no sense in paying $500 or less for something that's just going to be junk in a few months.
If you need a medium duty Inverter-Generator, I highly recomend it. You will enjoy it. It's also very light and compact. Transporting it isn't a problem at all.
It easily powers drills, grinders, skill saws, table saws, sawzalls, and portable cement mixers - pretty much anything that draws under 16.7 Amps. Most power tools draw up to and under 15 Amps. My industrial right-angle concrete drill only draws 8 Amps, and that thing is rugged. It's more than enough for my needs for working in the woods where I can't just "Plug In."
Another thing that's slick about it is it also charges marine batteries and has its own special DC receptical and comes with the included cable. You just fire it up, hook up the terminals to your battery, then plug in the cord. It doesn't have a charge meter built in, so I purchased a hand held battery tester and check the charge level once an hour. I think the battery tester was under $30 (a good investment).
With that in mind, I used it last Memorial Day weekend during our Men's Family Fishing Trip out at Johnston Pond camp here in Maine, out in the woods roughing it with tents. The area is surrounded with small-ish ponds, so my dad and I brought our little skiff and trolling motor with us (too small ponds for our larger, 2-stroke boat). We brought two 12 volt marine batteries with us to make sure we could spend the whole day out each day, then that evening charge one or the other up so it was ready for the next day. It worked great, we didn't have to worry about running our batteries low and having to paddle all the way back to the landing. Peace of mind is nice.
This unit really is really quiet. There were five of us on the fishing trip, two younin's - my friend and I, and three old farts - my dad, uncle, and elderly cousin. They complain about everything (old people tend to do that, haha). I figured someone was going to say something about the generator being noisey and I'd catch hell for it or something, but actually, everyone did nothing but praise how quiet it was. After it's been running for 15 minutes or so, you kind of forget that it's even there. Unlike our neighbors at a site a ways away from us, who had an old style generator that they ran at night, we could hear them having to hollar at each other in order to talk.
On top of all that goodness, since it's an Inverter as well, you can also safely power computers, charge cell phones and iPods, run a tv and DVD player, and plenty of other things, if that's what you're into while camping, or in an emergency situation.
It starts up really easy. Mine started first pull right out of the box (make sure to put oil in it first, it's not included), and still does every time. If you run it on Eco Mode (tv's, appliances, ect.) I'm not sure how long the tank will last you hour-wise, I haven't used it for that application yet, but in full power mode, meaning you're constantly getting the amped up rpms for more amperage, the one gallon tank lasts for about 6 hours or so. I'd figure that it'd almost double that in Eco mode, and it's twice as quiet. You can stand right next to it and it's like a little humm.
I give the Yamaha EF2000iS five stars hands down for the price and performance. I'm really happy I didn't go ahead and go with a knock off lesser brand. It was well worth the extra money for something that's going to be reliable and dependable. There's no sense in paying $500 or less for something that's just going to be junk in a few months.
If you need a medium duty Inverter-Generator, I highly recomend it. You will enjoy it. It's also very light and compact. Transporting it isn't a problem at all.
90 of 91 people found the following review helpful
Amazon Verified Purchase
This generator is super quiet and the engine runs really smoothly. It instantly changes it's operating speed just as fast as I can move the speed switch on a 1850 watt hair dryer I used to test it. It doesn't include oil and the angle of the oil fill hole is nearly horizontal, making it a little difficult to fill even with a funnel, but they did put a nice little drip tray right below the opening so it doesn't go everywhere. The gas gauge is really nice. Made in Japan. Their competitor (Honda) has some nice videos on their website demonstrating the sound level of actual generators running and the equivalent size Honda generator is very close in noise level to this one. Yamaha should do the same but until then, check out the Honda website.
Yamaha says this is CARB compliant on their website so I'm not sure why Amazon says it isn't. The label on the generator says it is a 3 on the 10 point California emission scale. Yamaha simply isn't making a big deal of it like some others do I suppose. This is a new model as of summer 2009. The starter cord is really easy to pull - unlike any other engine I've ever started by hand.
Yamaha says this is CARB compliant on their website so I'm not sure why Amazon says it isn't. The label on the generator says it is a 3 on the 10 point California emission scale. Yamaha simply isn't making a big deal of it like some others do I suppose. This is a new model as of summer 2009. The starter cord is really easy to pull - unlike any other engine I've ever started by hand.
Most Recent Customer Reviews
Great little generator
This generator has been extensively reviewed, and rated very highly. Having now used it I agree with the consensus that it is easy to start, very quiet, and handles up to rated... Read more
Published 21 days ago by Peter
A great buy
I like this generator. I read every review I could find before I bought it, and waffled back and forth between it and the Honda 2,000 watt unit (which was slightly less... Read more
Published 27 days ago by MarkB
Just purchased a Yamaha EF2000iS
The main requirements I had for my generator purchase were:
1. reliable backup power
2. excellent fuel efficiency with at least 10 hours on 1 fuel tank, so I could have a... Read more
1. reliable backup power
2. excellent fuel efficiency with at least 10 hours on 1 fuel tank, so I could have a... Read more
Published 27 days ago by Jacobo
YAMAHA = QUALITY AS ALWAYS...
This gas powered inverter generator works great when you need power on the go. Yamaha always makes a quality product.
Published 1 month ago by Rocco G.
Great little generator; just wish it had an oil gauge.
I live in Southern California and bought this after we lost power for a long time and because I'm paranoid about earthquakes. It's very easy to use, very light and very quiet. Read more
Published 1 month ago by Steve
What More Can One Say
It was always really between Honda and Yamaha. I did look at some other generators out there because they were cheaper (from China) but when the manufacturer can only say, or will... Read more
Published 1 month ago by Chris
Love this little thing!
I was undecided between Honda and Yamaha but after reading many reviews on various forums, including Amazon but mainly camping forums, I decided on this Yamaha - AND WHAT A GOOD... Read more
Published 2 months ago by Pen Pundit
Yamaha EF2000iS Great Generator
Bought this generator October 2010. Run A/C with it during summer months while camping. Run deer camp with it during the winter. This is a fantastic machine. Read more
Published 2 months ago by Russ
Yamaha, For The Long Haul
This is my second Yamaha generator. My first was a 2400is. After almost 5000 grueling desert and sand dune hours, I decided to replace it even though it still ran perfect. Read more
Published 2 months ago by C. Baumgarten
Best Little Generator
Bought this generator a few months ago right after a hurricane knocked out our power for 5 days. Fortunately the power came back but it was before I had a chance to use it for... Read more
Published 2 months ago by TFD 357
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