Model EF4500iSEThe Yamaha EF4500iSE is a 4500-watt inverter generator designed for maximum efficiency and minimal noise, suitable for emergency backup, recreational use, and DIY projects.
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Here's the quick tradeoff view — what this model does well, and where it may not fit.
The Yamaha EF4500iSE is a gasoline generator rated for 4000 running watts with 4500 starting watts. That combination targets both steady power delivery and the extra surge needed when certain loads first kick on.
Because it is explicitly an inverter generator, it pairs its wattage output with inverter-style power production, which is a meaningful detail for anyone thinking about how the generator’s electricity will behave with modern devices.
Running at 4000 watts with a 4500-watt starting capacity, the EF4500iSE is built to handle continuous demand while also covering short startup spikes. Its gasoline fuel system is matched with a 4.5-gallon tank, and the provided runtime figure of 15.2 hours at 25 percent load translates into long stretches between refueling when the generator is not being pushed near its maximum output.
Noise is listed at 58 dBA, which places a clear, quantified ceiling on how loud it is at the measurement point used for that rating. For power quality, the generator lists 3 percent THD, a concrete indicator of how cleanly it shapes its electrical output, and that number aligns with the inverter designation for users who care about stable electricity. A runtime value at 50 percent load is given as 0, so the only stated runtime performance is the 15.2 hours at 25 percent load.
At 209 lbs, the EF4500iSE is a substantial unit to move, and its physical size reinforces that it is designed to occupy a meaningful footprint when stored or deployed. The listed dimensions of 30.7 x 24.3 x 27.2 inches help set expectations for fitting it into a garage corner, shed space, or a dedicated spot near where it will be operated.
Starting is handled through an electric starting system, which supports quick, push-button style operation compared with manual pull starting. Day-to-day monitoring is aided by a fuel gauge and indicators, giving you direct, on-unit feedback about fuel status and operating conditions without needing extra tools.
For electrical management, AVR is included, which is a defined feature aimed at regulating voltage as loads change. Compliance is explicitly listed as CARB and EPA, and a spark arrestor is included, both of which speak to where and how the generator can be used under those rule sets. Yamaha backs the EF4500iSE with a 3-year warranty, providing a stated coverage term for longer-term ownership.
Needs 240V output
Needs 240V output
Needs 240V output
Needs 240V output
Est. running: 1,800W
Peak surge (single motor): 2,000W
Avoid starting multiple motor loads at the same time.
Est. running: 2,900W
Peak surge (single motor): 2,000W
Avoid starting multiple motor loads at the same time.
Est. running: 1,600W
Peak surge (single motor): 2,800W
Avoid starting multiple motor loads at the same time.
These are estimates using typical wattage assumptions. Real appliances vary. Startup surges can be 2–6× the running wattage for motor-driven loads. 240V loads require a 120/240V generator and proper connection. Use a transfer switch or interlock kit; never backfeed a panel.
Yamaha is a respected leader in the generator industry, recognized for their innovation, quality, and reliability in portable and backup power solutions.
| Fuel | Running | Starting | Runtime @50% | Runtime @25% |
|---|---|---|---|---|
| Gasoline | 4000W | 4500W | Not available | 15.2h |
| Running Watts | 4,000 watts |
|---|---|
| Starting Watts | 4,500 watts |
| Starting Watts (Gasoline) | 4,500 W |
| Running Watts (Gasoline) | 4,000 W |
| Engine | Yamaha MZ360 OHV 4-stroke |
|---|---|
| Engine Type | OHV 4-stroke |
| Engine Displacement | 357 cc |
| Engine Oil Capacity | 1.3 Qt |
| Spark Arrestor | Yes |
| Emissions Compliance | CARB, EPA |
| Voltage (AC) | 120 |
|---|---|
| Phase | Single |
| Running Amps | 33.3 A |
| Peak Amps | 37.5 A |
| AC Frequency | 60 hz |
| Current | 33.3 amps |
| GFCI Outlets | No |
| Neutral | Floating |
| AC Outlets | 1x Duplex 120V 20A (5-20R)1x 120V 30A (L5-30R) |
| Total Harmonic Distortion (THD) | 3 % |
| Dimensions | 30.7 x 24.3 x 27.2 inches |
|---|---|
| Weight | 209 lbs |
| Automatic Low Oil Shutdown | Yes |
|---|---|
| Emissions Compliance | CARB, EPA |
| Automatic Voltage Regulation | Yes |
| Automatic Voltage Regulator | Yes |
| Battery | Battery |
| Carbon Monoxide Sensor | Yes |
| Covered Outlets | No |
| Electric Start | Yes |
| Fuel Gauge | Yes |
| Fuel Tank Capacity | 4.5 gallons |
| Included Accessories | Battery |
| Indicators | Yes |
| Inverter | Yes |
| Noise Level | 58 dBA |
| Overload Protection | Low oil and overload protection, CO monitoring |
| Parallel Capable | No |
| Part Number | EF45ISEZ |
| Recoil Start | No |
| Remote Start | Yes |
| RV Ready | No |
| Starter Type | Electric |
| Starting System | Electric |
| UPC | 765,053,833,196 |
| Warranty | 3 years |
| Wheels | Yes |
| Fuel Type | Gasoline |
|---|
| Runtime @ 25% | 15.2 hours |
|---|---|
| Runtime @ 25% Load (Gasoline) | 15.2 hours |
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