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.
- Genmax GM3300i
- Powerhorse 2500i
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 | Genmax GM3300i | Powerhorse 2500i |
|---|---|---|
| General | ||
| Product type | Generator | Generator |
| Fuel | Gasoline | Gasoline |
| Inverter | Yes | Yes |
| Parallel capable | Yes | Yes |
| RV ready | Yes | No |
| Running watts | Winner: Winner: 3000 W | 1800 W |
| Starting watts | Winner: Winner: 3300 W | 2500 W |
| Noise (lower limit) | Winner: Winner: 62 dB | Winner: Winner: 62 dB |
| Weight | Winner: Winner: 47.4 lbs | 48.3 lbs |
| Run time @50% load | 4.5 h | Winner: Winner: 9.5 h |
| Run time @25% load | 6 h | 10.5 h |
| Fuel tank | 1 gal | 1.2 gal |
| Fuel gauge | No | No |
| Approx. dimensions (L × W × H) | 18.9 x 11.4 x 17.3 | 20.4 x 12.5 x 18.3 |
| Electrical | ||
| Voltage (AC) | 120 | 120 |
| Voltage (DC) | 5 | Not available |
| GFCI outlets | No | No |
| Covered outlets | Yes | Yes |
| Automatic Voltage Regulation | Yes | Yes |
| THD | Not available | 3 % |
| Engine | ||
| Engine | 145 cc Dinking OHV 4-stroke | 80 cc OHV 4-stroke |
| Alternator | Not available | Not available |
| Starting system | Recoil | Recoil |
| Warranty | ||
| Warranty | 1 years | 2 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 3000 W | Not available |
| Starting watts | 3300 W | 2500 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 | 4.5 h | 9.5 h |
| Run time @25% load | 6 h | 10.5 h |
| Other | ||
| Data center | Not available | Not available |
| Indicators | true | true |
| Compliance | EPA, ANSI/PGMA G300-2023 | EPA, ANSI/PGMA G300-2023 |
| Security | Not available | Not available |
| Spark arrestor | Yes | Yes |
| Neutral | Floating | Floating |
| UPC | 768494056087 | 840321763969 |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 3000 | Not available |
| Starting Watts (Gasoline) | 3300 | 2500 |
| Runtime @ 50% Load (Gasoline) | 4.5 | 9.5 |
| Runtime @ 25% Load (Gasoline) | 6 | 10.5 |
| 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) |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | Dinking OHV 4-stroke | 80 cc OHV 4-stroke |
| Engine Displacement | 145 | 80 |
| Engine Oil Type | 10W-30 | Not available |
| Runtime & fuel system | ||
| Runtime @ 25% Load (Gasoline) | 6 | 10.5 |
| Runtime @ 50% Load (Gasoline) | 4.5 | 9.5 |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection, CO monitoring | Low oil and overload protection, CO monitoring |
| Low Oil Protection | Yes | Yes |
| Carbon Monoxide Monitoring | Yes | Yes |
| Included equipment | ||
| Included Accessories | Funnel and tool kit | Funnel and tool kit |
| Warranty & identification | ||
| Commercial Warranty | Not available | 2 |
| Part Number | GE-3300A | Not available |
| Additional specs | ||
| Summary | The Genmax GM3300i is a 3000-watt gasoline inverter generator built for portability and clean power. At 47.4 lbs, it moves easily between campsites, job sites, and homes. The 3300-watt peak output handles startup surges on power tools and appliances, while the inverter technology protects laptops and phones from voltage spikes. | The Powerhorse 2500i is a portable inverter generator delivering 2,500 surge watts and 1,800 rated watts, featuring a quiet 52dB operation, CO shutdown function, and parallel-ready design for increased power needs. |
- Most PowerfulGenmax GM3300i3000W running
- QuietestGenmax GM3300i62 dB
- Longest RuntimePowerhorse 2500i9.5h at 50% load
Where to buy
Prices can change. We update these automatically.
Genmax GM3300i
Store links
No links yet.
Powerhorse 2500i
Store links
No links yet.
Disclosure: Some links may be affiliate links. Specs and comparisons are never hidden.