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.
- Generac #8251 GP2500i
- Aceup Energy AI1500s
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 | Generac #8251 GP2500i | Aceup Energy AI1500s |
|---|---|---|
| General | ||
| Product type | Generator | Not available |
| Fuel | Gasoline | Not available |
| Inverter | Yes | Yes |
| Parallel capable | Yes | No |
| RV ready | No | No |
| Running watts | Winner: Winner: 2200 W | 1200 W |
| Starting watts | Winner: Winner: 2500 W | 1500 W |
| Noise (lower limit) | 0 dB | Winner: Winner: 55 dB |
| Weight | Winner: Winner: 48 lbs | Not available |
| Run time @50% load | 4.5 h | Winner: Winner: 6 h |
| Run time @25% load | 8 h | Not available |
| Fuel tank | 1 gal | 0.6 gal |
| Fuel gauge | No | No |
| Approx. dimensions (L × W × H) | 19.7 x 11.4 x 17.9 | Not available |
| Electrical | ||
| Voltage (AC) | 120 | Not available |
| Voltage (DC) | 12 | Not available |
| GFCI outlets | No | No |
| Covered outlets | Yes | No |
| Automatic Voltage Regulation | Yes | No |
| THD | Not available | Not available |
| Engine | ||
| Engine | 98 cc OHV 4-stroke | 4-stroke OHV engine |
| Alternator | Not available | Not available |
| Starting system | Recoil | Not available |
| Warranty | ||
| Warranty | 3 years | 1 years |
| Power by fuel | ||
| Gasoline | Not available | Not available |
| Running watts | 2200 W | 1200 W |
| Starting watts | 2500 W | 1500 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 | Not available |
| Run time @25% load | 8 h | Not available |
| Other | ||
| Data center | Not available | Not available |
| Indicators | true | Not available |
| Compliance | EPA, ANSI/PGMA G300-2023 | Not available |
| Security | Not available | Not available |
| Spark arrestor | Yes | No |
| Neutral | Not available | Not available |
| UPC | 696471003946 | Not available |
| Core / High-priority specs | ||
| Running Watts (Gasoline) | 2200 | 1200 |
| Starting Watts (Gasoline) | 2500 | 1500 |
| Runtime @ 50% Load (Gasoline) | 4.5 | Not available |
| Runtime @ 25% Load (Gasoline) | 8 | Not available |
| AC Outlet Types | 1x Duplex 120V 20A (5-20R) | One 120V AC outlet |
| Electrical & power | ||
| Frequency | 60 | 60 |
| Engine & construction | ||
| Engine Type | 98 cc OHV 4-stroke | 4-stroke OHV |
| Engine Displacement | 98 | Not available |
| Engine Oil Type | 10W-30 | Not available |
| Runtime & fuel system | ||
| Runtime @ 25% Load (Gasoline) | 8 | Not available |
| Runtime @ 50% Load (Gasoline) | 4.5 | Not available |
| Controls & display | ||
| Display Type | Not available | Digital display |
| Safety & compliance | ||
| Overload Protection System | Low oil and overload protection | Not available |
| Low Oil Protection | Yes | No |
| Carbon Monoxide Monitoring | Yes | No |
| Included equipment | ||
| Starting Components | Recoil | Not available |
| Included Accessories | Oil, funnel, tool kit, and battery charging cables | Not available |
| Warranty & identification | ||
| Residential Warranty | Not available | 1 |
| Commercial Warranty | 3 | 1 |
| Part Number | 82512 | AI1500s |
| Additional specs | ||
| Summary | The Generac GP2500i is a 2200-watt inverter generator built for portable backup power and recreational use. At 48 pounds, it moves easily between campsites, job sites, and emergency situations. The inverter technology means laptops, phones, and sensitive tools run safely because the power output stays stable. This unit runs on gasoline and delivers 2500 starting watts, so it can handle the initial surge when motors kick on. | The Aceup Energy AI1500s is a 1200 watt inverter generator powered by a 4-stroke OHV engine, designed for portable power needs. |
- Most PowerfulGenerac #8251 GP2500i2200W running
- QuietestAceup Energy AI1500s55 dB
- Longest RuntimeAceup Energy AI1500s6h at 50% load
Where to buy
Prices can change. We update these automatically.
Generac #8251 GP2500i
Store links
No links yet.
Aceup Energy AI1500s
Store links
No links yet.
Disclosure: Some links may be affiliate links. Specs and comparisons are never hidden.