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| Specification | Briggs & Stratton 30728 Storm Responder | Cat RP5500 |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Gasoline | Gasoline |
| Inverter | No | No |
| Parallel capable | No | No |
| RV ready | No | No |
| Running watts | Winner: Winner: 6250 W | 5500 W |
| Starting watts | Winner: Winner: 8500 W | 6875 W |
| Noise (lower limit) | 0 dB | 0 dB |
| Weight | 210 lbs | Winner: Winner: 178 lbs |
| Run time @50% load | 11 h | Winner: Winner: 15 h |
| Run time @25% load | Not available | Not available |
| Fuel tank | 7.5 gal | 7.9 gal |
| Fuel gauge | Yes | Yes |
| Approx. dimensions (L × W × H) | 28 x 27 x 28 | 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 | Yes | Yes |
| Automatic Voltage Regulation | Yes | Yes |
| THD | Not available | Not available |
| Engine | ||
| Engine | Briggs & Stratton® | 300 cc OHV 4-stroke |
| Alternator | Not available | Not available |
| Starting system | Recoil | Recoil |
| Warranty | ||
| Warranty | 2 years | 2 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 6250 W | 5500 W |
| Starting watts | 8500 W | 6875 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 | 11 h | 15 h |
| Run time @25% load | Not available | Not available |
| Other | ||
| Data center | Not available | Not available |
| Indicators | true | false |
| Compliance | ANSI/PGMA G300-2018 | CARB, EPA |
| Security | Not available | Not available |
| Spark arrestor | Yes | Yes |
| Neutral | true | Not available |
| UPC | 11675307288 | 815683020036 |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 6250 | 5500 |
| Starting Watts (Gasoline) | 8500 | 6875 |
| Runtime @ 50% Load (Gasoline) | 11 | 15 |
| AC Outlet Types | 2x Duplex 120V 20A (5-20R); 1x 120/240V 30A (L14-30R) | 2x Duplex 120V 20A (5-20R) GFCI, 1x 120/240V 30A (L14-30R) |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | 1850 Series™ OHV Engine | OHV 4-stroke |
| Engine Displacement | 420 | 300 |
| Engine Oil Type | Not available | SAE 30 or 10W-30 |
| Runtime & fuel system | ||
| Runtime @ 50% Load (Gasoline) | 11 | 15 |
| Controls & display | ||
| Display Type | StatStation™ Digital Display | Not available |
| Idle Control System | No | Not available |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection; CO monitoring | Low oil and overload protection |
| Low Oil Protection | Yes | Yes |
| Carbon Monoxide Monitoring | Yes | No |
| Included equipment | ||
| Mobility Components | 10" Never Go Flat Wheels | Not available |
| Starting Components | Recoil | Not available |
| Documentation | operator's manual or illustrated parts list | Not available |
| Included Accessories | Extension cord and wheel kit | Oil, funnel, tool kit, and wheel kit |
| Warranty & identification | ||
| Residential Warranty | 2 | Not available |
| Commercial Warranty | 0.25 | Not available |
| Part Number | 030728 | 502-3686 |
| Additional specs | ||
| Summary | The Briggs & Stratton 30728 Storm Responder is a 6250-watt gasoline generator built for homeowners and job sites that need sustained power for essential appliances and tools. With 8500 peak watts, it can start large loads like air compressors and refrigerators that draw high inrush current. The 7.5-gallon fuel tank delivers 11 hours of runtime at half load, meaning users can run the unit through a full workday or overnight without refueling. This is a stationary-leaning portable unit, not a grab-and-go machine. | The Cat RP5500 is a 5500-watt gasoline generator built for homeowners, contractors, and outdoor enthusiasts who need reliable backup power without the complexity of larger units. This wattage tier handles most household circuits simultaneously, meaning you can run a refrigerator, well pump, and power tools at the same time, but not your entire home's air conditioning system. The 6875-watt peak capacity gives it the muscle to start high-inrush devices like compressors and sump pumps without stalling. Because the RP5500 runs on gasoline, fuel is available at any gas station, eliminating the supply chain friction of propane or diesel models. The 7.9-gallon tank paired with 15-hour runtime at half load means you refuel roughly once per day under typical use, not every few hours. |
