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| Specification | Firman P03503 | Cat RP3600 |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Gasoline | Gasoline |
| Inverter | No | No |
| Parallel capable | No | No |
| RV ready | Yes | Yes |
| Running watts | 3550 W | Winner: Winner: 3600 W |
| Starting watts | 4450 W | Winner: Winner: 4500 W |
| Noise (lower limit) | Winner: Winner: 67 dB | 0 dB |
| Weight | Winner: Winner: 108.5 lbs | 125 lbs |
| Run time @50% load | Winner: Winner: 14 h | 13.5 h |
| Run time @25% load | Not available | Not available |
| Fuel tank | 5 gal | 4.5 gal |
| Fuel gauge | Yes | Yes |
| Approx. dimensions (L × W × H) | 24.8 x 21.7 x 21.7 | 28.4 x 25.2 x 23 |
| Electrical | ||
| Voltage (AC) | 120 | 120V 60 Hz |
| Voltage (DC) | Not available | Not available |
| GFCI outlets | No | No |
| Covered outlets | Yes | Yes |
| Automatic Voltage Regulation | Yes | Yes |
| THD | Not available | Not available |
| Engine | ||
| Engine | 208 cc OHV 4-stroke, cast iron sleeve. | 212 cc OHV 4-stroke |
| Alternator | Not available | Not available |
| Starting system | Recoil | Recoil |
| Warranty | ||
| Warranty | 3 years | 2 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | Not available | 3600 W |
| Starting watts | 4450 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 | 14 h | 13.5 h |
| Run time @25% load | Not available | Not available |
| Other | ||
| Data center | Not available | Not available |
| Indicators | true | false |
| Compliance | EPA, ANSI/PGMA G300-2023 | CARB, EPA |
| Security | Not available | Not available |
| Spark arrestor | Yes | Yes |
| Neutral | Floating | true |
| UPC | 840876135037 | 815683020005 |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | Not available | 3600 |
| Starting Watts (Gasoline) | 4450 | 4500 |
| Runtime @ 50% Load (Gasoline) | 14 | 13.5 |
| AC Outlet Types | 1x Duplex 120V 20A (5-20R)1x 120V 30A (L5-30R)1x 120V 30A (TT-30R) | 2x Duplex 120V 20A (5-20R) 1x 120V 30A (TT-30R) |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | OHV 4-stroke, cast iron sleeve | OHV 4-stroke |
| Engine Displacement | 208 | 212 |
| Cylinder Sleeve | cast iron | Not available |
| Engine Oil Type | Not available | SAE 30 or 10W-30 |
| Runtime & fuel system | ||
| Runtime @ 50% Load (Gasoline) | 14 | 13.5 |
| 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 | Oil, funnel, tool kit, and wheel kit |
| Included Accessories | Oil, funnel, tool kit, cover, and wheel kit | Oil, funnel, tool kit, and wheel kit |
| Warranty & identification | ||
| Commercial Warranty | 3 | Not available |
| Part Number | Not available | 502-3684 |
| Additional specs | ||
| Summary | The Firman P03503 is a 3,550-watt gasoline generator built around a 208cc OHV 4-stroke engine with a cast iron sleeve. This wattage handles mid-range household loads: a refrigerator, microwave, and several outlets running simultaneously, or a modest RV power setup. The 5-gallon fuel tank delivers 14 hours of runtime at 50% load, meaning a full tank covers a typical overnight camping trip or a daytime power outage without refueling. The 4,450 starting watts give it enough surge capacity to turn on air conditioning compressors or well pumps, making it practical for both emergency backup and recreational use. | The Cat RP3600 is a 3600-watt gasoline generator built for job sites and RV camping. Its 4500-watt peak output handles startup surges for power tools and air conditioners, while the 3600-watt running capacity sustains multiple household circuits or a single large appliance continuously. |