Product Code: EF6300iSDE

In-stock orders received by 2PM PST ship the same day. Click here to see when you'll receive your generator. PayPal financing available. 

$5,199.00$4,597.00Save 12%
3-Year Factory Warranty

On All Yamaha Generators

Free shipping

With Generator Purchases

Live Customer Support

Based In The USA

California Compliant

CARB-compliant generators

Genuine Factory New Yamaha Generators

Yamaha EF6300iSDE 6300 Watt Generator with CO Sensor
The Yamaha EF6300iSDE weighs 200 pounds, starts with ease with its electric starter, and is capable of running an RV air conditioner, microwave oven and more all at the same time. Designed to be acoustically sound, this extremely quiet generator (58-64 dBA) features Smart Throttle which allows greater fuel efficiency and noise reduction. It will run up to 19 hours at ¼ rated load on a tank of gas. With features such as Built-In Wheels, Electric Start, Power Meter and an Oil Watch Warning System, the EF6300iSDE is one of the most powerful well equipped portable inverters in its class!

Top Features

CO Sensor for Safety
Shuts off at high level CO detection
Oil Watch Warning System
Prevents engine damage from low oil
Dual 120/240V Power
Run almost any type of equipment
Smart Throttle
Greater fuel efficiency, noise reduction

Additional features

  • Noise Block ‐ Quiet, pleasant to use.
  • Pure Sine Wave (Pulse Width Modulation) Inverter System ‐ Run electronic equipment, appliances, variable-speed power tools and computers.
  • Smart Throttle ‐ Automatically adjusts engine speed to match power demand, reduces noise, fuel consumption and engine wear.
  • Wireless Remote (Optional) ‐ Start & Stop the generator from up to 66 feet away.
  • Electric start ‐ Effortless starting (battery included).
  • Automatic choke ‐ Effortless starting.
  • Low oil shutoff ‐ Protects engine from low oil damage.
  • Fuel level gauge ‐ See fuel level at a glance.
  • Dual voltage 120/240 volt ‐ Versatile, operate variety of 120V and 240V tools and appliances.
  • Power meter ‐ See how much power is being used and how much power is available.
  • Hour meter ‐ Shows accumulated running time for refueling and service scheduling.
  • Lightweight ‐ Easy transport.
  • Twin bar ‐ Aid lift, transport and provide security point.
  • Stylish design ‐ Nice appearance and Modern design.
  • 50 state legal ‐ Meets CARB emission regulations and given highest EPA rating.


  • Model / Model Code: EF6300iSDE
  • Warranty Type: 3 Year Limited Warranty
  • Dimensions (length/width/height): 30.7" x 24.3" x 27.2"
  • Dry Weight: 200 lbs
  • Engine Type: OHV, Air-Cooled, Four-Stroke, Single Cylinder
  • Displacement: 357cc
  • Capacity: 4.5 Gallons
  • Fuel Type: Unleaded Regular
  • Cooling Type: Air Cooled
  • Generator Type: Brushless, Inverter
  • Maximum AC Output: 6300 Watts
  • Rated AC Output: 5500 Watts
  • Rated AC Current / Max AC Current: 45.8 amps /52.5 amps @120V | 22.9 amps/26.3 amps @ 240V
  • Noise Level 1/4 Load/ Full Load: 58 dBA / 64 dBA
  • Continuous Operation at 1/4 Rated Load: 13.3 hours

Customer Reviews

Based on 68 reviews
Wylie D.

We love this generator. Also have a 3000 watt Yamaha we have had for 6 years that runs perfectly. Never have had an issue. Decided to purchase a larger Yamaha for back up at the cabin. Followed the directions and one push of the button started right up. Yamaha may be a little more expensive when compared to other generators. They are worth every penny!!


Excellent customer service. The rep even called back the next day to be sure I was getting the right size for my property and needs. I'm so grateful to the company. THANK YOU for an excellent support system and great service.


Perfect size to run the whole house and my water pump. Living in the country the power goes out alot. This generator provides power to the water supply for my large animals and heat in the house. WHEW! It's a blessing. Thank you

Yamaha EF6300 Generator

Impressed, struggled with battery, but once installed started with no problem, very satisifed!

G t.
Co2 sensor is awful

Love the generator when it’s working properly and running ., but the co2 sensor keeps shutting it off if the wind is blowing the exhaust right back at it and you know how wind can be. As long as you have the wind blowing it away works just fine

Rachel S.
Exactly What We Were Looking For!

Great product and great customer service! We look forward to working with our rep again.

Victoria Z.
Great Customer Service

Thanks to Larry for working with me the order and delivery process. Very glad to finally have my generator - delayed due to global supply chain issues for several months. However as soon as the items came in my experience was fast and easy through to delivery.

Jeffrey M.
I have two of these generators

I purchased two of these inverter generators 11 years ago. The first one has remote start. These generators were purchased to provide power during a hurricane outage. I pulled both gens out two weeks ago for Hurricane Laura. Both fired up and run perfect under loads. These are dependable generators. I only run non ethanol premium fuel in each. I replace the fuel with fresh fuel every year. The carbs are stored dry of fuel. I am on the third battery for each generator. I cannot store with the battery in the generator due to a parasitic drain that empties the batteries in less than two months. The two batteries are kept on a battery tender. Other than that, I highly recommend these generators especially if you have a low amperage 240 volt application.

Perfect transaction and delivery

I initially ordered a generator from another vendor, only to find out that it was out-of-stock and wasn't shipping.

My order at National Supply was processed and shipped the same day, and it arrived within the cross-country shipping window provided (1 week). My local driver assisted with a tailgate delivery and the contents arrived packed extremely well and in perfect condition.


Customer service, price, quality and timeliness of delivery. The packaging was PERFECT. I’ve honestly never seen better. The box was flawless. Generator looks very nice. Can’t wait to use it. Highly recommend.

National Supply Flag Logo White

Our Services

Free Shipping
Free shipping

On All Generators

Livre Customer Support
Live Customer Support

6:30AM-4:30PM PST

Home Delivery
Home Delivery

At No Additional Charge

Liftgate Service
Liftgate Service

Free With Select Generators