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| Specification | Yamaha EF5500D | Cat RP12000 E |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Gasoline | Gasoline |
| Inverter | No | No |
| Parallel capable | No | No |
| RV ready | No | Yes |
| Running watts | 4500 W | Winner: Winner: 12000 W |
| Starting watts | 5500 W | Winner: Winner: 15000 W |
| Noise (lower limit) | Winner: Winner: 74.1 dB | 0 dB |
| Weight | Winner: Winner: 216.1 lbs | 350 lbs |
| Run time @50% load | Winner: Winner: 13.5 h | 11.7 h |
| Run time @25% load | Not available | Not available |
| Fuel tank | 6.9 gal | 13.2 gal |
| Fuel gauge | Yes | Yes |
| Approx. dimensions (L × W × H) | 29.1 x 29 x 31.5 in | 35.7 x 32.7 x 35.8 |
| Electrical | ||
| Voltage (AC) | 120/240V 60 Hz | 120/240 |
| Voltage (DC) | Not available | 12 |
| GFCI outlets | Yes | Yes |
| Covered outlets | No | Yes |
| Automatic Voltage Regulation | Yes | Yes |
| THD | Not available | 5 % |
| Engine | ||
| Engine | Yamaha MZ360 OHV 4-stroke | 670 cc Rato OHV V-Twin |
| Alternator | Not available | Not available |
| Starting system | Recoil | Electric |
| Warranty | ||
| Warranty | 3 years | 2 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 4500 W | 12000 W |
| Starting watts | 5500 W | 15000 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 | 13.5 h | 11.7 h |
| Run time @25% load | Not available | 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 | Not available | 815683023891 |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 4500 | 12000 |
| Starting Watts (Gasoline) | 5500 | 15000 |
| Runtime @ 50% Load (Gasoline) | 13.5 | 11.7 |
| AC Outlet Types | 2x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R) | 2x Duplex 120V 20A (5-20R) GFCI; 2x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R); 1x 120/240V 50A (14-50R) |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | OHV 4-stroke | 670 cc Rato OHV V-Twin |
| Engine Displacement | 358 | 670 |
| Runtime & fuel system | ||
| Runtime @ 50% Load (Gasoline) | 13.5 | 11.7 |
| Safety & compliance | ||
| Overload Protection System | Not available | Low oil and overload protection |
| Low Oil Protection | Yes | Yes |
| Carbon Monoxide Monitoring | Yes | No |
| Included equipment | ||
| Mobility Components | Yes | Not available |
| Starting Components | Not available | Battery, Battery Charger, Wheel Kit |
| Included Accessories | Tool kit and wheel kit | Oil, funnel, tool kit, battery charger, battery, and wheel kit |
| Warranty & identification | ||
| Part Number | EF55DZ1 | 502-3700 |
| Additional specs | ||
| Summary | The Yamaha EF5500D is a 5500-watt generator designed for emergency backup, recreational use, and DIY projects. It features a 358cc OHV engine, dual voltage output, and offers up to 9 hours of continuous operation at rated load. | The Cat RP12000 E is a 12,000-watt gasoline generator built for job sites, construction crews, and homeowners who need sustained power for multiple heavy tools or appliances simultaneously. The 15,000-watt peak output handles startup surges from air compressors, circular saws, and welders without stalling. At 350 pounds, this is a stationary or semi-portable unit. It ships with a wheel kit, battery charger, and full tool set, meaning users can operate it immediately without additional purchases. |