Yamaha EF3000iS Inverter Portable Generator Review

Yamaha EF3000iS Inverter Portable Generator

Yamaha EF3000iS

The Yamaha EF3000iS inverter generator can deliver 2,800 watts of continuous clean electricity while being able to surge up to 3,000 watts. This unit is CARB compliant.

Yamaha Motor Corporation with its brand name of Yamaha is well known through out the world for their quality products. Though they are better known for their motorcycles, their ATVs as well as their outboard motors, they are also well known for their engines and power equipment utilizing these engines.

The Yamaha EF 3000iS portable inverter generator is one of their products which uses their famous engines as well as the cutting edge technology to bring to you an inverter generator that is one of the best on the market. This generator produces clean electricity that can be used to power sensitive electronic equipment safely.

Two older models are being discounted which are the electric start models, EF3000iSE and EF3000iSEB, although they are still available in some outltets.

Power Output and Generation

The Yamaha EF3000iS 2,800 watt portable inverter generator is equipped with a 171 cc OHV single cylinder, air cooled 4 stroke engine which allows it to produce 2,800 watts of continuous power and surge up to 3,000 watts. The engine is started on this model with a recoil rope which utilizes the auto decompression for easy starting.

This generator is specifically equipped with Pulse Width Modulation which delivers clean electricity to run all your sensitive electronic equipment. As a CARB rated unit it is approved for use in California.

Outlet configuration:

The rated amperage is 23.3 amps for 120V which is 2796W (~2800W), The max available amps is 25 amps at 120V which is the 3000 watts for surge.

For all their quality and literature it is amazing that the one are in which basic information is lacking is the actual outlets used on the machine. Yamaha does not come out and indicate the NEMA receptacle types.

yamaha-ef3000is-outletsOn this model there is one duplex 5-20R outlet and a L5-30R outlet, and a DC charging circuit.

The duplex outlet is rated at 20 amps for 2400W and the L5 can take up to the 23.3 amps which is about 2800W. The outlets can be used in combination up to the total continuous rating. The DC circuit is rated at 12 amps for 144W.

Fuel Type and Noise Levels:

The Yamaha EF3000iS inverter generator uses gasoline as fuel. It is equipped with a fuel tank with a capacity of 3.4 gallons and per the marketing of the unit it run for 19 hours at 25% load capacity. This is great, but if you’re a power user at 50% load expect more along the lines of 10 hours.

This generator has an acoustically designed sound reduction system which makes for a quiet generator producing between 53Db and 60 Db of sound at about 23 feet away. That’s very quiet and will please all your neighbors whether at home or at the RV park..

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Dimensions and Weight

The overall dimensions of the Yamaha EF3000iS inverter generator are 26.8 x 17.5 x 21.9 inches ( L x W x H ) and it weighs in at 136 lbs. Add another 20 lbs for gas and it becomes a bit heavy but generally manageable with the four wheels used to maneuver the unit around.

At this size it the generator is very compact, albeit a bit heavy.

Typical Uses and Needs

The Yamaha EF 3000iS inverter generator can deliver about 2,800 watts of continuous power. This generator is also very quite and fuel efficient, the electricity that this generator produces is low distortion “very clean” and can run sensitive electronic equipment safely.

This makes this generator ideal for camping or for use in your RV to power electrical appliances. It can also be used in your home as a backup power source in times of emergencies to run a few essentials.

It has a smart throttle and can sense loads which lets it run for long periods of time conserving fuel.

Display & Control Panel, Start-up

Yamaha EF3000iS Control Panel

Yamaha EF3000iS Control Panel

The control panel of the Yamaha EF3000iS generator is located on the side of the generator. If you face the control panel you will see that to the top left is the Engine switch which is used to start, run and stop the engine. Next to it on the right you have the Economy control switch which lets the engine adjust to the load placed on the generator saving fuel.

To the right of this switch you have the 12Volt DC receptacle. To the right of the DC receptacle you have a duplex 120 Volt 5-20R receptacle and next to it on the right you have a 120Volt L5-30R twist lock receptacle.

Now again to the left below the Engine switch you have the Fuel valve knob and to the right of this you have the Choke knob. To the right of the Choke you have the Oil warning light and to the right of this you have the AC pilot light. Above the AC pilot light you have the DC circuit breaker and next to the pilot light to the right you have the Overload indicator light and next to it on the right you have the Ground Terminal.


The Yamaha EF3000iS inverter generator is equipped with an electric start and it also has a recoil start. Here are the steps to be taken to start the generator.

  1. Check and see that the engine oil is at the prescribed level.
  2. Check and see that there are no loads connected to the generator.
  3. Turn the Economy Switch to the Off position.
  4. Turn the Fuel valve to the On position.
  5. Pull the Choke fully Out.
  6. For electric start, iSE and ISB models only. Turn the Engine switch to the Start position. Release the switch as soon as the engine starts.
  7. For manual start. Pull slowly on the recoil starter till you feel a resistance, then pull sharply.
  8. After the engine starts let it warm up for a couple of minutes.
  9. Push the Choke to its original position.

Shut Down

  1. Turn Off and disconnect all loads from the generator.
  2. Turn the Economy control switch to the Off position.
  3. Turn the Engine switch to the Off position.
  4. Turn the fuel valve to the Off position.

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Additional Features

Here are some of the features of the Yamaha EF 3000iS inverter generator.

  1. It is very quit developing between 53 Db and 60Db of sound level at 23 feet.
  2. It has an independent fuel petcock which helps reduce carburetor cleaning due to stale gas.
  3. It has a smart throttle with load sensing that adjusts the engine speed to the load, saving fuel and reducing the noise level.
  4. One of the best in fuel efficiency. .
  5. It delivers clean electricity to run sensitive electronic equipment safely.
  6. It comes with 12 Volt battery charging cables.
  7. It has an automatic oil level Shut Off system.
  8. It has 4 wheels with a parking brake for easy maneuverability.
  9. It is CARB compliant and available in all 50 states.
  10. It has a warranty that covers the entire generator for defects in parts and workmanship for 3 years.

Care and Maintenance and Use

Regular maintenance and proper care is very important to ensure that your generator performs at its best and gives you long lasting service. Here is the maintenance schedule as prescribed by Yamaha for the Yamaha EF3000iS inverter generator.

  1. Check the exhaust system for any leakages.
  2. Check the engine oil level.
  3. Check the fuel line.
  4. Check the Choke operation.
  5. Check the Starter operation.
  6. Check to see that the pilot light comes On.

First month or after 20 hours

  1. Change the engine oil.

Every 3 months or after 50 hours

  1. Check the spark plug and replace if necessary.
  2. Clean the air filter and replace if necessary.

Every 6 months or after 100 hours

  1. Change the engine oil.
  2. Clean the fuel tank filter and replace if necessary.
  3. Check all fittings and tighten if necessary.

Every 12 months or after 300 hours

  1. Check and adjust valve clearances.
  2. Check the breather hose and replace if necessary.
  3. Check and adjust the engine idle speed.
  4. Check and clean the spark arrester and replace if necessary.

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Warranty and Repairs

The Yamaha Motor Corporation covers the Yamaha EF3000iS inverter generator with a warranty for 3 years from date of purchase to a non commercial user and for a period of 2 year for a commercial user.

This is one of the best warranties for a residential market. The warranty covers all defective parts or defective workmanship and will be repaired free of charge by any Yamaha consumer generator dealer.

This warranty can be transferred to a subsequent purchaser but the generator will need to be inspected and registered by an authorized Yamaha consumer generator dealer. An inspection and registration fee is charged for this service.

Consumer Comments

yamaha-ef3000is-sideThe Yamaha EF 3000iS inverter generator is a very new addition by Yamaha to its generator line up. Although this generator has not been rated as yet on Amazon, the discontinued models iSE and ISB which where reviewed by customers seem to be very pleased with its performance.

Customers liked the fact that it was very quiet and used very little fuel. Some of the customers used this generator for camping and on their RVs and were pleased that it could run their air conditioner. They also liked the fact that they could run their computers with this generator without any fear of damaging it.

The only thing negative that a few customers had to say about this generator was that it was a bit heavy. Which could be expected by the quality and insulation of this size of generator.

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Pros & Cons


  • It is very quiet with a 23 foot radius for very low noise levels at 53Db to 60 Db, It is possible to easily carry on a conversation when next to the generator. .
  • It is equipped with 4 wheels and parking brake which make it easy to move it around.
  • It produces clean electricity which is safe for all sensitive electronic equipment.
  • It is CARB compliant and is available in all 50 states.
  • It has a smart throttle with load sensing RPM control which gives it greater fuel efficiency while reducing the noise level.
  • It can run for up to 19 hours on one fuel tank at 25% load range, and likely 10 to 12 at 50% load.
  • It has a centralized control panel which makes it easy to access the controls.
  • It comes with battery charging cables.
  • It has an automatic low oil level shut off to protect the engine.


  • It is heavy for its size compared to others, but due to the packaging and effort to quiet the machine..
  • It is expensive compared to others, but not so for comparatively built units with inverter and noise control.


The Yamaha EF3000iS inverter generator has a listed price of $1,900.00 but it is available for less with free shipping from some of the sellers on Amazon. Since it is new on the market the price of this generator varies between $1,800.00 and $1,900.00 between the different dealers of this generator.


Accessories for the Yamaha EF3000iS generator can be found at your Yamaha dealer. You can get a cover for your generator to protect it when not in use.

Yamaha ACC-GNCVR-30-01 Generator Cover for Models EF3000iS and EF3000iSEB

You can also get a RV adapter plug for L5 to RV30.

Reliance Controls AP31RV 30 Amp L5-30 to RV Generator Power Adapter Plug

You can also find power cords of different lengths available to connect your generator to your appliances.

Conntek 14350 RV Power Cord 25-Foot RV 30 Amp Male Plug To 30 Amp Locking Female Connctor

Conntek 20571 Generator Extension Cord 25-Foot 10/3 30 Amp 3 Prong NEMA L5-30 Eextension Cord

Go Here to see more power cords

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The Yamaha EF 3000iS inverter generator is manufactured by Yamaha Motor Corporation. This company is world famous for its engines and quality products.

This generator is capable of producing 2,800 watts of continuous power and surging up to 3,000 watts. It is a very quiet generator, is also very fuel efficient and delivers clean electricity that is safe for your sensitive electronic equipment.

This generator can be used as a back up for your home to run a few essentials during power outages. It is an ideal generator to have in your RV to run your air conditioner and other electrical appliances. It is also a very good companion to take camping for your electrical needs.

Similar Generation Units:

The following Generators are similar to the above but at different wattage sizes

Yamaha EF3000iSEB Portable Generator

Yamaha EF2400iSHC Portable Generator

Yamaha EF4500iSE 4,500 Watt 357cc OHV 4-Stroke Gas Powered Portable Inverter Generator With Electric Start (CARB Compliant)

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