Compare Generators Side-by-Side
Select up to 4 generators to compare specs, power output, noise levels, runtime and more. Your compare URL is shareable.
- Yamaha EF6300iSDE
- Cat RP6500 E
Quick charts
Each chart uses its own Y-axis scale (so numbers are comparable within a chart).
Running watts
W
Starting watts
W
Noise
dB
Runtime @50%
h
Running watts by fuel
Shows how output changes across gasoline/propane/natural gas (when available).
| Specification | Yamaha EF6300iSDE | Cat RP6500 E |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Gasoline | Gasoline |
| Inverter | Yes | No |
| Parallel capable | No | No |
| RV ready | No | No |
| Running watts | 5500 W | Winner: Winner: 6500 W |
| Starting watts | 6300 W | Winner: Winner: 8125 W |
| Noise (lower limit) | Winner: Winner: 58 dB | 0 dB |
| Weight | 216 lbs | Winner: Winner: 202 lbs |
| Run time @50% load | 5 h | Winner: Winner: 12 h |
| Run time @25% load | 13.3 h | Not available |
| Fuel tank | 4.5 gal | 7.9 gal |
| Fuel gauge | Yes | Yes |
| Approx. dimensions (L × W × H) | 30.7 x 24.3 x 27.2 | 32.9 x 27.4 x 24.7 |
| Electrical | ||
| Voltage (AC) | 120/240 | 120/240 |
| Voltage (DC) | Not available | Not available |
| GFCI outlets | Yes | Yes |
| Covered outlets | No | Yes |
| Automatic Voltage Regulation | Yes | Yes |
| THD | <4.0% % | Not available |
| Engine | ||
| Engine | 357 cc Yamaha MZ360 OHV 4-stroke | 420 cc OHV 4-stroke |
| Alternator | Not available | Not available |
| Starting system | Electric | Recoil, Electric |
| Warranty | ||
| Warranty | 3 years | 2 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 5500 W | 6500 W |
| Starting watts | 6300 W | 8125 W |
| Running amps (120V) | Not available | Not available |
| Running amps (240V) | Not available | Not available |
| Peak amps (120V) | Not available | Not available |
| Peak amps (240V) | Not available | Not available |
| Run time @50% load | Not available | 12 h |
| Run time @25% load | 13.3 h | Not available |
| Other | ||
| Data center | Not available | Not available |
| Indicators | true | false |
| Compliance | CARB, EPA | CARB, EPA |
| Security | Not available | Not available |
| Spark arrestor | Yes | Yes |
| Neutral | true | true |
| UPC | 765053849371 | 815683020067 |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 5500 | 6500 |
| Starting Watts (Gasoline) | 6300 | 8125 |
| Runtime @ 50% Load (Gasoline) | Not available | 12 |
| Runtime @ 25% Load (Gasoline) | 13.3 | Not available |
| AC Outlet Types | 1x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R) | 2x Duplex 120V 20A (5-20R); 1x 120/240V 30A (L14-30R); 1x 120V 30A (L5-30R) |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | OHV 4-stroke | OHV 4-stroke |
| Engine Displacement | 357 | 420 |
| Engine Oil Type | Not available | SAE 30 or 10W-30 |
| Runtime & fuel system | ||
| Runtime @ 25% Load (Gasoline) | 13.3 | Not available |
| Runtime @ 50% Load (Gasoline) | Not available | 12 |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection | Low oil and overload protection |
| Low Oil Protection | Yes | Yes |
| Carbon Monoxide Monitoring | Yes | No |
| Included equipment | ||
| Starting Components | Not available | Recoil, Electric |
| Included Accessories | Battery | Oil, funnel, tool kit, battery, and wheel kit |
| Warranty & identification | ||
| Part Number | EF63ISDEX | 502-3688 |
| Additional specs | ||
| Summary | The Yamaha EF6300iSDE is a powerful and advanced inverter generator, ideal for emergency backup, recreational use, and DIY projects. It offers a maximum output of 6300 watts and operates quietly between 58 to 64 decibels. | The Cat RP6500 E is a 6500-watt gasoline generator built for residential backup and light commercial work. Its 8125-watt peak capacity means it can start large tools and appliances that draw high inrush current, then sustain 6500 watts of continuous power for multiple devices simultaneously. A 7.9-gallon fuel tank delivers 12 hours of runtime at 50% load, which translates to roughly one full workday or overnight backup without refueling. The gasoline engine is straightforward to maintain and refuel anywhere, making this unit practical for job sites, outdoor events, and emergency home power. |
- Most PowerfulCat RP6500 E6500W running
- QuietestYamaha EF6300iSDE58 dB
- Longest RuntimeCat RP6500 E12h at 50% load
Where to buy
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Yamaha EF6300iSDE
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Cat RP6500 E
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