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| Specification | Firman P03631 | Yamaha EF5500D |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Gasoline | Gasoline |
| Inverter | No | No |
| Parallel capable | No | No |
| RV ready | Yes | No |
| Running watts | 3650 W | Winner: Winner: 4500 W |
| Starting watts | 4450 W | Winner: Winner: 5500 W |
| Noise (lower limit) | 75 dB | Winner: Winner: 74.1 dB |
| Weight | Winner: Winner: 119.5 lbs | 216.1 lbs |
| Run time @50% load | Winner: Winner: 14 h | 13.5 h |
| Run time @25% load | Not available | Not available |
| Fuel tank | 5 gal | 6.9 gal |
| Fuel gauge | Yes | Yes |
| Approx. dimensions (L × W × H) | 24.8 x 21.7 x 21.7 | 29.1 x 29 x 31.5 in |
| Electrical | ||
| Voltage (AC) | 120/240 | 120/240V 60 Hz |
| Voltage (DC) | 12 | Not available |
| GFCI outlets | Yes | Yes |
| Covered outlets | Yes | No |
| Automatic Voltage Regulation | Yes | Yes |
| THD | <25% % | Not available |
| Engine | ||
| Engine | 208 cc Firman Max-Pro Series OHV 4-stroke, cast iron sleeve | Yamaha MZ360 OHV 4-stroke |
| Alternator | Not available | Not available |
| Starting system | Recoil, Electric, Remote | Recoil |
| Warranty | ||
| Warranty | 3 years | 3 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 3650 W | 4500 W |
| Starting watts | 4450 W | 5500 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 | 14 h | 13.5 h |
| Run time @25% load | Not available | Not available |
| Other | ||
| Data center | Not available | Not available |
| Indicators | true | true |
| Compliance | CARB, EPA, ANSI/PGMA G300-2023 | CARB, EPA |
| Security | Not available | Not available |
| Spark arrestor | Yes | Yes |
| Neutral | true | true |
| UPC | 840876136317 | Not available |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 3650 | 4500 |
| Starting Watts (Gasoline) | 4450 | 5500 |
| Runtime @ 50% Load (Gasoline) | 14 | 13.5 |
| AC Outlet Types | 1x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (TT-30R); 1x 120/240V 30A (L14-30R) | 2x Duplex 120V 20A (5-20R) GFCI; 1x 120V 30A (L5-30R); 1x 120/240V 30A (L14-30R) |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | 208 cc Firman Max-Pro Series OHV 4-stroke, cast iron sleeve | OHV 4-stroke |
| Engine Displacement | 208 | 358 |
| Cylinder Sleeve | cast iron sleeve | Not available |
| Runtime & fuel system | ||
| Runtime @ 50% Load (Gasoline) | 14 | 13.5 |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection | Not available |
| Low Oil Protection | Yes | Yes |
| Carbon Monoxide Monitoring | Yes | Yes |
| Included equipment | ||
| Mobility Components | Yes | Yes |
| Included Accessories | Oil, funnel, tool kit, key fob, battery, and wheel kit | Tool kit and wheel kit |
| Warranty & identification | ||
| Commercial Warranty | 3 | Not available |
| Part Number | Not available | EF55DZ1 |
| Additional specs | ||
| Summary | The Firman P03631 is a 3,650-watt gasoline generator built for homeowners, RV users, and outdoor enthusiasts who need reliable backup power without breaking portability limits. At this wattage, the unit can run a refrigerator, microwave, and several power tools simultaneously, or power an RV's air conditioning and appliances during camping trips. The 4,450-watt peak capacity handles the startup surge of compressors and air conditioners, which draw 2 to 3 times their running wattage on initial startup.
The P03631 delivers 14 hours of runtime at 50% load from its 5-gallon tank, meaning a user can power essential devices through a full day and night without refueling. This runtime window makes it practical for weekend camping or a 24-hour power outage without the need for a second fuel run. The gasoline fuel type keeps refueling simple at any gas station, and the inclusion of a fuel gauge eliminates guesswork about tank level. | 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. |