GENMAX GM9000iET review: our full analysis
Brand: GENMAX · Ranked 46th of 174 · Our methodology
7.4/10 Power8.6 Runtime— Noise7.5 Features9.5 Portability8.8 Watts per dollar6.1 Dotted line: average of the 174 models. Relative scores based on specs, no hands-on testing. Where to buy Today's best priceTypical price: $1,200–$1,800 Check best price Affiliate link: As an Amazon Associate we earn from qualifying purchases.Not clearly published by the manufacturer, take with caution: runtime, parallel capability, CARB compliance.
Pros
- Tri-fuel inverter: 8,000, 7,000 or 6,500 running watts on gasoline, propane or natural gas.
- 138.5 lb on four wheels, with a 14-50R outlet.
- 2-wire auto start, Bluetooth app and remote fob.
Cons
- 4.76-gallon tank; runtime is not published.
- No L14-30R twist-lock.
- Only two 5-20R outlets.
Best for
- RVs and travel trailers, through its 14-50R outlet
- Home backup through a transfer switch or an interlock kit
Specifications
| Type | Tri fuel inverter (inverter: clean power) |
|---|---|
| Running watts | 8,000 W gasoline · 7,000 W propane · 6,500 W natural gas |
| Starting watts | 9,000 W gasoline · 8,000 W propane · 7,000 W natural gas |
| Fuel | Gasoline, propane, natural gas |
| Fuel tank | 4.76 gal |
| Runtime | Not published |
| Noise | 62 dB(A) (manufacturer figure) |
| Weight | 138.5 lb |
| Outlets | 2 × 120 V household outlets (5-20R) · L5-30R 30 A 120 V twist-lock · 14-50R 50 A 120/240 V · 12 V DC outlet |
| Transfer switch ready | Yes |
| Start | Remote key fob + electric push-button + recoil |
| CO shutoff sensor | Yes |
| Parallel capable | No |
| Emissions | EPA compliant |
| Engine | 349 cc |
| Warranty | 3 years |
GENMAX GM9000iET8,000 running W · Tri fuel inverter · typical price $1,200–$1,800
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Who is it for?
The GENMAX GM9000iET is mostly suited to:
- RVs and travel trailers, through its 14-50R outlet.
- Home backup through a transfer switch or an interlock kit.
What will a 9,000-watt generator run?
The GENMAX GM9000iET delivers 8,000 W continuously and up to 9,000 W for a few seconds to start motors on gasoline. On propane, the manufacturer rates it at 7,000 running watts (8,000 W starting), 12% less. On natural gas: 6,500 running watts (7,000 W starting). It handles 14 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 | ✅ Yes |
| RV roof AC (13,500 BTU) | 1,800 W / 2,800 W | ✅ Yes |
| Circular saw | 1,400 W / 2,300 W | ✅ Yes |
| Well pump (1 HP, 240 V) | 1,000 W / 4,000 W | ✅ Yes |
| Central AC (3-ton, soft start) | 3,800 W / 5,500 W | ✅ Yes |
Typical figures; check the label of your own appliances. One load at a time: add up everything you run together.
GENMAX GM9000iET8,000 running W · Tri fuel inverter · typical price $1,200–$1,800
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Runtime and fuel
The fuel tank holds 4.8 gallons of gasoline. On propane, a standard 20 lb tank holds about 4.7 gallons of LP; propane does not go stale, which makes it the easiest fuel to stock.
62 dB(A): how loud is it?
The manufacturer rates the GENMAX GM9000iET 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.
Outlets: home, RV and tools
Its panel offers 2 × 120 V household outlets (5-20R), L5-30R 30 A 120 V twist-lock, 14-50R 50 A 120/240 V, 12 V DC outlet. The 14-50R outlet supplies 120/240 V, which is what a manual transfer switch or an interlock kit with a power inlet box connects to, installed by a licensed electrician. Never backfeed the house through a wall outlet.
Safety features and warranty
It starts with a remote key fob or the electric push-button, with a recoil cord as backup. 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 $1,200–$1,800: good value per watt?
Relative to its running watts, the GENMAX GM9000iET scores 6.1/10 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 GM9000iET8,000 running W · Tri fuel inverter · typical price $1,200–$1,800
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Our verdict on the GENMAX GM9000iET
The GENMAX GM9000iET scores 7.4/10 and ranks 46th out of 174 generators analyzed. Its strengths: tri-fuel inverter: 8,000, 7,000 or 6,500 running watts on gasoline, propane or natural gas; 138.5 lb on four wheels, with a 14-50R outlet. It is best suited to RVs and travel trailers, through its 14-50R outlet and home backup through a transfer switch or an interlock kit.
GENMAX GM9000iET8,000 running W · Tri fuel inverter · typical price $1,200–$1,800
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Featured in our rankings
Sources
- Official GENMAX product page (specifications)
- Amazon.com listing (availability and typical price, November 2026)
Frequently asked questions
Will the GENMAX GM9000iET run a refrigerator?
Yes: its 8,000 running watts and 9,000 starting watts cover a full-size fridge, including the compressor's startup surge.
Can the GENMAX GM9000iET power a house?
It can back up the essentials through a transfer switch or interlock kit connected to its 14-50R outlet.
Does the GENMAX GM9000iET run on propane?
Yes, it is tri fuel: 7,000 running watts on propane and 6,500 on natural gas.
Is the GENMAX GM9000iET quiet?
The manufacturer rates it at 62 dB(A), typical of an open-frame generator: not campground-quiet.
GENMAX GM9000iET8,000 running W · Tri fuel inverter · typical price $1,200–$1,800
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GENMAX GM9000iET7.4/10 · $1,200–$1,800
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