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Yamaha EF2000iS 2,000 Watt 79cc OHV 4-Stroke Gas Powered Portable Inverter Generator (CARB Compliant)
I have had this for about a month. 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 about twice as loud, 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.
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 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. If generators are abused it will lead to regulations banning them.
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.
- 2,000 Watt Maximum AC Output/1,600 Watt Rated AC Output
- Super-quiet muffler with USFS-approved Spark Arrestor
- Smart Throttle varies engine speed based on load
- Inverter system with Pulse Width Modulation (PWM) control
- CARB Compliant
Inverter System with Pulse Width Modulation (PWM) Control Can safely run products wit...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.EF2000iS Inverter
At a Gla
Rating: 
(out of 7 reviews)
List Price: $ 1,099.00
Price: $ 989.10
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Posted by Irwan on August 16, 2008
Review by Scott Kopper for Yamaha EF2000iS 2,000 Watt 79cc OHV 4-Stroke Gas Powered Portable Inverter Generator (CARB Compliant)
Rating:
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.
Review by Paul Raymond for Yamaha EF2000iS 2,000 Watt 79cc OHV 4-Stroke Gas Powered Portable Inverter Generator (CARB Compliant)
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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.
Review by Martin for Yamaha EF2000iS 2,000 Watt 79cc OHV 4-Stroke Gas Powered Portable Inverter Generator (CARB Compliant)
Rating:
Received this product and filled with oil and gas and it started on the third pull. All subsequent times it has started on the first pull of the starter cord. More money than a comparable Honda 2000 but it has a number of advantages.
1. All controls are on one side on a simple control panel including the starter pull. Honda controls are scattered on both sides.
Much easier operation in confined spaces.
2. Has a very visible fuel gage. Not supplied on the Honda
3. Has a carb fuel shut-off which allow you run the fuel system dry for storage. No such system on the Honda
4. The carb bowl has a drain screw and drain tube to remove all remaining fuel-if any. No easy carb drain on Honda.
5. Unit weighs over 50 lbs with a full fuel tank and oil but lighter than a Honda and every pound is important when carrying this weight.
6. Overall service and maintenance is very easy.
7. Low pollution total operating hours are twice the Honda
8. Larger carry handle.
9. Very quiet at all speeds - extremely quiet at the eco throttle or low speeds/low loads.
Researched the low cost Chinese knock-offs and there really is no comparison from a noise and weight factor. The comparable Honeywell and Kipor etc are about ten pounds heavier for comparable output specs. Ten pounds additional is about 60 lbs wet and 20% difference but a huge amount when carrying any distance.
Overall well worth the money for an extremely well designed quality product that is Yamaha’s reputation. Amazon service and delivery was spot on as usual.
Review by Rollin’ Bones for Yamaha EF2000iS 2,000 Watt 79cc OHV 4-Stroke Gas Powered Portable Inverter Generator (CARB Compliant)
Rating:
Can’t testify to longevety yet, but I have been running a pair of new EF2000iS gennies on my travel trailer for two weeks. I run the pair to power a 15,000 BTU air conditioner and it has been HOT here. I bought these because I can’t lift the old one into the pick-up anymore. I think everything gets heaver as I get older. These little guys only weigh about 45 lb or so and I can handle them.
The little Yahamhas have been running nearly continous for about 6 days & most of the nights without a glitch so far. Most quiet generator that I have almost never heard (Have not had a chance to compare with Honda) and all my neighbors agree. Even at full power needed to run the A.C., you can hardly tell they are running at 60 feet and can’t hear them at all in the camper from 15 feet away. Nobody cares if I run them late at night cause their generators are running much louder!
Each one will run everything but the A.C. by itself and the ECO setting is REALLY quiet. I can’t really tell just how long a tank of fuel lasts because I have been refueling every 4 hours of so at full throttle. I am kinda chicken to let one of them die while the A.C. is on…afraid it might overload the other or cause a problem with the A.C. itself. I want to get a dual extended run fuel tank, but none of them appear to be for the 2000iS. Mostly a difference in the fuel cap I think.
Anyway, I will have the first 100 hours on my pair this month. I will know in a few months if they are worth the money…but I bet they are!