GENMAX GM2800iSAC inverter generatorCheck best price → All photos, customer reviews and today's price →
Easy to carry · Gas inverter · 2,300 W

GENMAX GM2800iSAC review: our full analysis

Brand: GENMAX · Ranked 138th of 174 · Our methodology

6.3/10 Power5.2 Runtime4.1 Noise7.5 Features6.3 Portability8.2 Watts per dollar7.2 Dotted line: average of the 174 models. Relative scores based on specs, no hands-on testing. Where to buy Today's best priceTypical price: $300–$500 Check best price Affiliate link: As an Amazon Associate we earn from qualifying purchases.
Key takeaways. The GENMAX GM2800iSAC pairs a 2,300 W running rating with inverter technology for clean power, built for camping, tailgating and small jobs away from an outlet. It weighs 45.2 lb and is rated at 62 dB(A). Notable features: a CO shutoff sensor.

Not clearly published by the manufacturer, take with caution: parallel capability, EPA compliance, CARB compliance.

Pros

  • 2,300 running watts from a 145cc engine.
  • 45.2 lb, light enough for one person to carry.
  • Parallel-capable, with CO shutdown and dual USB ports.

Cons

  • 0.9-gallon tank: about 6 hours at 25% load.
  • Only one 5-20R duplex; no TT-30R or 30 A outlet on this version.
  • 62 dB(A) at 23 ft and 25% load.

Best for

  • Camping, tailgating and small jobs away from an outlet

Specifications

TypeGas inverter (inverter: clean power)
Running watts2,300 W gasoline
Starting watts2,800 W gasoline
FuelGasoline
Fuel tank0.9 gal
Runtime6 hr at 25% load · ≈ 3 hr 50 min at 50% load (estimate)
Noise62 dB(A) (manufacturer figure)
Weight45.2 lb
Outlets2 × 120 V household outlets (5-20R) · USB ports
Transfer switch readyNo (no 240 V outlet)
StartRecoil (pull start)
CO shutoff sensorYes
Parallel capableYes
EmissionsEPA compliant
Engine145 cc
Warranty3 years
GENMAX GM2800iSAC2,300 running W · Gas inverter · typical price $300–$500 Check price and availability

Who is it for?

The GENMAX GM2800iSAC is mostly suited to:

  • Camping, tailgating and small jobs away from an outlet.
1

Power output: running and starting watts

The GENMAX GM2800iSAC delivers 2,300 W continuously and up to 2,800 W for a few seconds to start motors. It handles 11 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.

ApplianceRunning / starting wattsWill it run?
Wi-Fi router and modem20 W / 20 W✅ Yes
CPAP (no humidifier)50 W / 50 W✅ Yes
Laptop or TV150 W / 150 W✅ Yes
Full-size refrigerator700 W / 2,200 W✅ Yes
Chest freezer500 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 heater1,500 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✅ Yes
Circular saw1,400 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.

GENMAX GM2800iSAC2,300 running W · Gas inverter · typical price $300–$500 Check best price
2

How long does it run on a tank?

The fuel tank holds 0.9 gallons of gasoline. The manufacturer quotes 6 hr at a quarter load. At half load, count on roughly 3 hr 50 min (our estimate from the quarter-load figure). That is about 0.24 gallon per hour at half load, or 6 gallons for a full day of running, so plan your fuel storage for a multi-day outage.

Fuel tank0.9 galgasoline
At 25% load6 hrmanufacturer figure
At 50% load3 hr 50 minestimate
Fuel per day≈ 6 gal24 h at half load
3

62 dB(A): how loud is it?

The manufacturer rates the GENMAX GM2800iSAC at 62 dB(A), usually measured at 23 feet (7 m) and a light load. That is about the level of a conversation or a dishwasher: acceptable at a campground.

4

Can you connect it to your house?

Its panel offers 2 × 120 V household outlets (5-20R), USB ports. 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.

5

Starting, safety 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).

6

Typical price $300–$500: good value per watt?

Relative to its running watts, the GENMAX GM2800iSAC scores 7.2/10 on value: an average result. 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.

GENMAX GM2800iSAC2,300 running W · Gas inverter · typical price $300–$500 Check best price

Our verdict on the GENMAX GM2800iSAC

The GENMAX GM2800iSAC scores 6.3/10 and ranks 138th out of 174 generators analyzed. Its strengths: 2,300 running watts from a 145cc engine; 45.2 lb, light enough for one person to carry. It is best suited to camping, tailgating and small jobs away from an outlet.

GENMAX GM2800iSAC2,300 running W · Gas inverter · typical price $300–$500 Check best price

Featured in our rankings

Best inverter generators89th of 120Best generator for camping34th of 61Best lightweight portable generator29th of 55Best generator with a CO shutoff sensor109th of 129Best parallel capable inverter generator70th of 98Best 3500 watt generator23rd of 32Best generator under $50034th of 54Best generator under $1,00083rd of 111Best generator under $1,500110th of 142

Sources

Frequently asked questions

Will the GENMAX GM2800iSAC run a refrigerator?

Yes: its 2,300 running watts and 2,800 starting watts cover a full-size fridge, including the compressor's startup surge.

Can the GENMAX GM2800iSAC power a house?

Only plug-in appliances through extension cords: it has no 240 V outlet for a transfer switch.

How long does the GENMAX GM2800iSAC run on a tank?

About 3 hr 50 min at half load (our estimate), and 6 hr at a quarter load.

Does the GENMAX GM2800iSAC run on propane?

No, it runs on gasoline only.

Is the GENMAX GM2800iSAC quiet?

The manufacturer rates it at 62 dB(A), typical of an open-frame generator: not campground-quiet.

GENMAX GM2800iSAC2,300 running W · Gas inverter · typical price $300–$500 Check best price

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