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.
- Firman W03381
- Powerhorse s4500d
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 | Firman W03381 | Powerhorse s4500d |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Gasoline | Dual-Fuel |
| Inverter | Yes | No |
| Parallel capable | Yes | No |
| RV ready | Yes | Yes |
| Running watts | 3300 W | Winner: Winner: 3600 W |
| Starting watts | 3650 W | Winner: Winner: 4500 W |
| Noise (lower limit) | Winner: Winner: 58 dB | 95 dB |
| Weight | Winner: Winner: 87 lbs | 121 lbs |
| Run time @50% load | Not available | Winner: Winner: 10.6 h |
| Run time @25% load | 10 h | Not available |
| Fuel tank | 1.8 gal | 3.9 gal |
| Fuel gauge | No | Yes |
| Approx. dimensions (L × W × H) | 23.2 x 17.8 x 17.9 | 26.5 x 23.5 x 21.4 |
| Electrical | ||
| Voltage (AC) | 120 | 120 |
| Voltage (DC) | 12 | 5 |
| GFCI outlets | No | No |
| Covered outlets | Yes | Yes |
| Automatic Voltage Regulation | Yes | Yes |
| THD | 3 % | <23% % |
| Engine | ||
| Engine | 193 cc Firman Max-Pro Series OHV 4-Stroke, Cast Iron Sleeve | 212 cc OHV 4-stroke |
| Alternator | Not available | Not available |
| Starting system | Recoil | Recoil, Electric |
| Warranty | ||
| Warranty | 3 years | 2 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 3300 W | 3600 W |
| Starting watts | 3650 W | 4500 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 | 10.6 h |
| Run time @25% load | 10 h | Not available |
| Propane | Not available | Not available |
| Running watts | Not available | 3200 W |
| Starting watts | Not available | 4000 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 | 11 h |
| Run time @25% load | Not available | Not available |
| Other | ||
| Data center | Not available | Not available |
| Indicators | true | true |
| Compliance | CARB, EPA | EPA, ANSI/PGMA G300-2023 |
| Security | Not available | Not available |
| Spark arrestor | Yes | Yes |
| Neutral | Floating | Floating |
| UPC | 840876133811 | 840321764058 |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 3300 | 3600 |
| Running Watts (Propane) | Not available | 3200 |
| Starting Watts (Gasoline) | 3650 | 4500 |
| Starting Watts (Propane) | Not available | 4000 |
| Runtime @ 50% Load (Gasoline) | Not available | 10.6 |
| Runtime @ 50% Load (Propane) | Not available | 11 |
| Runtime @ 25% Load (Gasoline) | 10 | Not available |
| AC Outlet Types | 1x Duplex 120V 20A (5-20R); 1x 120V 30A (TT-30R) | 1x Duplex 120V 20A (5-20R); 1x 120V 30A (L5-30R); 1x 120V 30A (TT-30R) |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | OHV 4-Stroke | OHV 4-stroke |
| Engine Displacement | 193 | 212 |
| Cylinder Sleeve | Cast iron sleeve | Not available |
| Engine Oil Type | 10W-30 | Not available |
| Runtime & fuel system | ||
| Runtime @ 25% Load (Gasoline) | 10 | Not available |
| Runtime @ 50% Load (Gasoline) | Not available | 10.6 |
| Runtime @ 50% Load (Propane) | Not available | 11 |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection | Low oil and overload protection, CO monitoring |
| Low Oil Protection | Yes | Yes |
| Carbon Monoxide Monitoring | No | Yes |
| Included equipment | ||
| Starting Components | Recoil | Not available |
| Included Accessories | Oil, funnel, tool kit, and battery charging cables | Funnel, tool kit, propane hose, and wheel kit |
| Warranty & identification | ||
| Commercial Warranty | 3 | 2 |
| Additional specs | ||
| Summary | The Firman W03381 is a 3300-watt inverter generator built around a 193cc OHV 4-stroke engine with a cast iron sleeve. This wattage puts it in the mid-range portable segment, capable of powering a refrigerator, microwave, and several household circuits simultaneously, or running a single large tool on a job site. The 3650-watt starting capacity handles the inrush demand of compressors and air conditioning units. Because the W03381 runs on gasoline with a 1.8-gallon tank, users will find a 10-hour runtime at 25% load, which translates to roughly 2.5 hours of continuous full-load operation before refueling becomes necessary. The inverter topology and 3% THD output mean sensitive electronics like laptops, phones, and televisions receive stable, clean power without risk of damage. At 58 decibels, this generator operates at a volume comparable to normal conversation, making it suitable for residential neighborhoods and RV parks where noise restrictions apply. | The Powerhorse s4500d is a dual-fuel portable generator offering 4,500 surge watts and 3,600 rated watts, suitable for various applications including home backup and outdoor activities. |
- Most PowerfulPowerhorse s4500d3600W running
- QuietestFirman W0338158 dB
- Longest RuntimePowerhorse s4500d10.6h at 50% load
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Firman W03381
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