Generac GP2500i (82512, 49ST) review: our full analysis
Brand: Generac · Ranked 151st of 174 · Our methodology
6.0/10 Power5.1 Runtime4.5 Noise9.4 Features6.3 Portability7.3 Watts per dollar4.9 Dotted line: average of the 174 models. Relative scores based on specs, no hands-on testing. Where to buy Today's best priceTypical price: $500–$800 Check best price Affiliate link: As an Amazon Associate we earn from qualifying purchases.Not clearly published by the manufacturer, take with caution: noise level.
Pros
- 2,200 running and 2,500 starting watts at 48 lb, with under 3% THD.
- 120V 20A duplex, USB port and 12V DC outlet; parallel ready with GP2200i/GP2500i units.
- COsense CO shutdown and up to 8 hours at 25% load.
Cons
- 1-gallon tank: about 4.5 hours at 50% load.
- No RV (TT-30R) outlet on the unit itself.
- 49-state/CSA version: not for sale in California.
Best for
- Camping, tailgating and small jobs away from an outlet
- Places where noise matters: campgrounds, close neighbors
Specifications
| Type | Gas inverter (inverter: clean power) |
|---|---|
| Running watts | 2,200 W gasoline |
| Starting watts | 2,500 W gasoline |
| Fuel | Gasoline |
| Fuel tank | 1.0 gal |
| Runtime | 8 hr at 25% load · 4 hr 30 min at 50% load |
| Noise | 53 dB(A) (manufacturer figure) |
| Weight | 48.0 lb |
| Outlets | 2 × 120 V household outlets (5-20R) · USB ports · 12 V DC outlet |
| Transfer switch ready | No (no 240 V outlet) |
| Start | Recoil (pull start) |
| CO shutoff sensor | Yes |
| Parallel capable | Yes |
| Emissions | EPA compliant |
| Engine | 98 cc |
| Warranty | 3 years |
Generac GP2500i (82512, 49ST)2,200 running W · Gas inverter · typical price $500–$800
Check price and availability
Who is it for?
The Generac GP2500i (82512, 49ST) is mostly suited to:
- Camping, tailgating and small jobs away from an outlet.
- Places where noise matters: campgrounds, close neighbors.
Power output: running and starting watts
The Generac GP2500i (82512, 49ST) delivers 2,200 W continuously and up to 2,500 W for a few seconds to start motors. It handles 10 of the 14 loads on our typical list one at a time; add up the running watts of everything you run together, plus the extra starting watts of the biggest motor. As an inverter, it produces clean power suited to laptops, TVs and furnace control boards.
| Appliance | Running / starting watts | Will it run? |
|---|---|---|
| Wi-Fi router and modem | 20 W / 20 W | ✅ Yes |
| CPAP (no humidifier) | 50 W / 50 W | ✅ Yes |
| Laptop or TV | 150 W / 150 W | ✅ Yes |
| Full-size refrigerator | 700 W / 2,200 W | ✅ Yes |
| Chest freezer | 500 W / 1,500 W | ✅ Yes |
| Furnace blower (1/2 HP) | 800 W / 2,350 W | ✅ Yes |
| Sump pump (1/2 HP) | 1,050 W / 2,150 W | ✅ Yes |
| Microwave (1,000 W) | 1,000 W / 1,000 W | ✅ Yes |
| Space heater | 1,500 W / 1,500 W | ✅ Yes |
| Window AC (10,000 BTU) | 1,200 W / 3,600 W | ❌ No |
| RV roof AC (13,500 BTU) | 1,800 W / 2,800 W | ❌ No |
| Circular saw | 1,400 W / 2,300 W | ✅ Yes |
| Well pump (1 HP, 240 V) | 1,000 W / 4,000 W | ❌ Needs 240 V |
| Central AC (3-ton, soft start) | 3,800 W / 5,500 W | ❌ Needs 240 V |
Typical figures; check the label of your own appliances. One load at a time: add up everything you run together.
Generac GP2500i (82512, 49ST)2,200 running W · Gas inverter · typical price $500–$800
Check best price
How long does it run on a tank?
The fuel tank holds 1 gallon of gasoline. The manufacturer quotes 8 hr at a quarter load. At half load, it runs about 4 hr 30 min on a full tank. That is about 0.22 gallon per hour at half load, or 5 gallons for a full day of running, so plan your fuel storage for a multi-day outage.
53 dB(A): how loud is it?
The manufacturer rates the Generac GP2500i (82512, 49ST) at 53 dB(A), usually measured at 23 feet (7 m) and a light load. That is quieter than a normal conversation: suitable for campgrounds and close neighbors.
Outlets: home, RV and tools
Its panel offers 2 × 120 V household outlets (5-20R), USB ports, 12 V DC outlet. It has no 240 V outlet: it runs plug-in appliances through extension cords, not hardwired circuits or a 240 V well pump. It is parallel capable: linked to a second compatible unit with a parallel kit, the two outputs combine.
Start type, CO shutoff and warranty
It starts with a recoil (pull) cord. A CO shutoff sensor stops the engine if carbon monoxide builds up around it; it does not replace distance (20 feet from the house) and CO alarms indoors. It is listed as EPA compliant; check California availability if you live there. The warranty runs 3 years (residential use).
Typical price $500–$800: good value per watt?
Relative to its running watts, the Generac GP2500i (82512, 49ST) scores 4.9/10 on value: a high price per watt, which its other strengths may justify. Inverters always cost more per watt than open frames: compare it with other inverters. Generator prices on Amazon move a lot, especially before hurricane season: check the current price before you buy.
Generac GP2500i (82512, 49ST)2,200 running W · Gas inverter · typical price $500–$800
Check best price
Our verdict on the Generac GP2500i (82512, 49ST)
The Generac GP2500i (82512, 49ST) scores 6.0/10 and ranks 151st out of 174 generators analyzed. Its strengths: 2,200 running and 2,500 starting watts at 48 lb, with under 3% THD; 120V 20A duplex, USB port and 12V DC outlet; parallel ready with GP2200i/GP2500i units. It is best suited to camping, tailgating and small jobs away from an outlet and places where noise matters: campgrounds, close neighbors.
Generac GP2500i (82512, 49ST)2,200 running W · Gas inverter · typical price $500–$800
Check best price
Featured in our rankings
Sources
- Official Generac product page (specifications)
- Amazon.com listing (availability and typical price, November 2026)
Frequently asked questions
Will the Generac GP2500i (82512, 49ST) run a refrigerator?
Yes: its 2,200 running watts and 2,500 starting watts cover a full-size fridge, including the compressor's startup surge.
Can the Generac GP2500i (82512, 49ST) power a house?
Only plug-in appliances through extension cords: it has no 240 V outlet for a transfer switch.
How long does the Generac GP2500i (82512, 49ST) run on a tank?
About 4 hr 30 min at half load according to the manufacturer, and 8 hr at a quarter load.
Does the Generac GP2500i (82512, 49ST) run on propane?
No, it runs on gasoline only.
Is the Generac GP2500i (82512, 49ST) quiet?
The manufacturer rates it at 53 dB(A), quiet enough for most campgrounds.
Generac GP2500i (82512, 49ST)2,200 running W · Gas inverter · typical price $500–$800
Check best price
Generac GP2500i (82512, 49ST)6.0/10 · $500–$800
Check best price
Other Generac generators
Generac · Tri fuel
Generac GP9500E Tri Fuel (8063, 49ST)
9,500 W
219 lbCO
$800–$1,200Read the review →
7.9
Tri fuel
Generac · Tri fuel
Generac GP9500E Tri Fuel EFI (8061, 50ST)
9,500 W
227 lbCO
$1,200–$1,800Read the review →
7.6
CO shutoff
Generac · Dual fuel
Generac GP6700E DF (G0080623, 49ST)
6,700 W
181 lbCO
$800–$1,200Read the review →
7.6
CO shutoff
Generac · Gas
Generac GP8000E COsense (7715, 49ST/CSA)
8,000 W
198 lbCO
$800–$1,200Read the review →
Same price range, other brands
Genkins · Gas inverter
Genkins GK8000iE 8000W Inverter
6,500 W
62 dB(A)112 lbCO
$500–$800Read the review →
8.1
Best value
WEN · Dual fuel
WEN DF8000X 8000W Dual Fuel with CO Watchdog
6,500 W
139 lbCO
$500–$800Read the review →
8.0
Clean inverter power
Aceup Energy · Gas inverter
Aceup Energy AI8000 8000W Open Frame Inverter
6,000 W
106 lb
$500–$800Read the review →