GENMAX GM1200i Portable Inverter Generator 1200W
- 1,000 running watts, 1,200 starting
- Under 3% THD clean power
- 25.3 lb
- 58 dBA at 25% load, 23 feet
- 0.66 gallon tank, up to 6.5 hours at 50% load
- 120V/20A outlets plus 5V USB ports
- Parallel ready, CO shutdown
- 3 year warranty
Last refreshed Sep 7, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A very light inverter generator for camping and small backup loads like lights, fans and a TV. Its output is small, so anything with a big motor or heater is out.
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ASIN: B09GTKMG2FModel: GM1200iCategory: Generators
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Overview
Genmax builds this small inverter generator around a compact four stroke gas engine, giving clean power for phones, laptops, lights and fans. It weighs little enough to carry by its handle and has an economy mode to stretch fuel.
Low weight and quiet running are the case for it, making it easy to bring camping or tailgating. Clean output protects electronics. Total output is modest, so it pairs with a second unit for larger loads.
Who it's for
Campers, tailgaters and apartment dwellers wanting backup for lights and devices. Homes needing a refrigerator or sump pump through an outage need far more output.
Pros and cons
- Very light to carry
- Quiet at light load
- Safe for sensitive electronics
- Economy mode saves fuel
- Low total output
- Small fuel tank
- Outlet count not clearly stated
Performance notes
Economy mode lowers engine speed when demand is light, which is where the quiet and long runtime figures come from. Heavier loads push it to full speed and shorten runtime. Clean inverter output protects devices that dislike voltage spikes.
Specifications
| Brand | Genmax |
|---|---|
| Model | GM1200i |
| Dimensions & fit | |
| Item weight | 25.3 pounds |
| Capacity & performance | |
| Tank volume | 0.66 gallons |
| Noise level | 58 dBA at 25% load, 23 feet |
| Power & efficiency | |
| Running Wattage | 1,000 watts |
| Starting Wattage | 1,200 watts |
| Fuel Type | Gasoline |
| Total Power Outlets | 120V/20A outlets, one 5V/1A USB, one 5V/2.1A USB |
| Warranty & support | |
| Warranty Description | 3 year, lifetime technical support |
| Other details | |
| Runtime | Up to 6.5 hours at 50% load |
| Additional Features | Under 3% THD, economy mode, parallel ready, low oil alarm, overload alarm, CO warning light and shutdown |
| Engine Displacement | 57cc OHV, 4 stroke |
Frequently asked questions
What warnings does the Genmax GM1200i panel give?
A low oil alarm, an overload alarm, a CO warning light and an output indicator.
Can the Genmax GM1200i power a laptop?
Yes. Its inverter output is under 3% THD, which suits sensitive electronics.