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 P03503
- NorthStar c5500
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 P03503 | NorthStar c5500 |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Gasoline | Gasoline |
| Inverter | No | No |
| Parallel capable | No | No |
| RV ready | Yes | No |
| Running watts | 3550 W | Winner: Winner: 4500 W |
| Starting watts | 4450 W | Winner: Winner: 5500 W |
| Noise (lower limit) | Winner: Winner: 67 dB | 70 dB |
| Weight | Winner: Winner: 108.5 lbs | 227 lbs |
| Run time @50% load | 14 h | Winner: Winner: 15.1 h |
| Run time @25% load | Not available | Not available |
| Fuel tank | 5 gal | 8 gal |
| Fuel gauge | Yes | Yes |
| Approx. dimensions (L × W × H) | 24.8 x 21.7 x 21.7 | 41 x 32 x 29 |
| Electrical | ||
| Voltage (AC) | 120 | 120/240 |
| Voltage (DC) | Not available | Not available |
| GFCI outlets | No | Yes |
| Covered outlets | Yes | Yes |
| Automatic Voltage Regulation | Yes | Yes |
| THD | Not available | 5 % |
| Engine | ||
| Engine | 208 cc OHV 4-stroke, cast iron sleeve. | 270 cc Honda GX270 OHV 4-stroke |
| Alternator | Not available | Not available |
| Starting system | Recoil | true |
| Warranty | ||
| Warranty | 3 years | 4 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | Not available | 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 | 15.1 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 | 840321737519 |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | Not available | 4500 |
| Starting Watts (Gasoline) | 4450 | 5500 |
| Runtime @ 50% Load (Gasoline) | 14 | 15.1 |
| AC Outlet Types | 1x Duplex 120V 20A (5-20R)1x 120V 30A (L5-30R)1x 120V 30A (TT-30R) | 3x Duplex 120V 20A (5-20R) GFCI1x 120/240V 30A (L14-30R) |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | OHV 4-stroke, cast iron sleeve | OHV 4-stroke |
| Engine Displacement | 208 | 270 |
| Cylinder Sleeve | cast iron | Not available |
| Runtime & fuel system | ||
| Runtime @ 50% Load (Gasoline) | 14 | 15.1 |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection | Low oil and overload protection |
| Low Oil Protection | Yes | Yes |
| Carbon Monoxide Monitoring | Yes | Yes |
| Included equipment | ||
| Included Accessories | Oil, funnel, tool kit, cover, and wheel kit | Funnel and wheel kit |
| Warranty & identification | ||
| Commercial Warranty | 3 | 4 |
| Part Number | Not available | 1654400 |
| 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 NorthStar c5500 is a commercial-grade portable generator designed for demanding job sites, featuring a Honda GX270 OHV engine and Quiet Armor Technology for reduced noise levels. |
- Most PowerfulNorthStar c55004500W running
- QuietestFirman P0350367 dB
- Longest RuntimeNorthStar c550015.1h at 50% load
Where to buy
Prices can change. We update these automatically.
Firman P03503
Store links
No links yet.
NorthStar c5500
Store links
No links yet.
Disclosure: Some links may be affiliate links. Specs and comparisons are never hidden.