GENMAX GM10500XiT review: our full analysis

7,800 running watts: what can it power?

The GENMAX GM10500XiT delivers 7,800 W continuously and up to 10,500 W for a few seconds to start motors on gasoline. On propane, the manufacturer rates it at 7,000 running watts (9,500 W starting), 10% less. On natural gas: 6,250 running watts (8,500 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.

Typical figures; check the label of your own appliances. One load at a time: add up everything you run together.

GENMAX GM10500XiT7,800 running W · Tri fuel inverter · typical price $1,200–$1,800 Check best price

How long does it run on a tank?

The fuel tank holds 5.8 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.

74 dB(A): how loud is it?

The manufacturer rates the GENMAX GM10500XiT at 74 dB(A), usually measured at 23 feet (7 m) and a light load. That is loud, like a lawn mower: place it as far from the house and the neighbors as the cords allow.

Can you connect it to your house?

Its panel offers L14-30R 30 A 120/240 V twist-lock, 14-50R 50 A 120/240 V, USB ports, 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. It is parallel capable: linked to a second compatible unit with a parallel kit, the two outputs combine.

Starting, safety 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 GM10500XiT scores 7.1/10 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 GM10500XiT7,800 running W · Tri fuel inverter · typical price $1,200–$1,800 Check best price