GENMAX GM4000iSBEPC Inverter Generator vs Champion 4000W Dual Fuel Inverter

The Champion is the better all-around pick for most shoppers: it runs up to 10 hours on a tank, weighs about the same, and has CO Shield auto-shutoff plus a TT-30R outlet for RV use. The GENMAX wins on starting power and starting convenience, with a 3,200W continuous rating, push-button electric start and a digital LCD showing hours, voltage and load. Both use inverter power clean enough for electronics and both shut down on carbon monoxide. Owners of both lines praise quiet running and easy starts; the GENMAX's small tank and short runtime are the main complaint, while the Champion's recoil-only start and 120V-only output are its limits.

• Choose the GENMAX if you want push-button electric start, a higher 3,200W continuous output, and a path to 240V by pairing two units.
• Choose the Champion if you want long runtime, a TT-30R RV outlet, and automatic CO shutdown in a light, quiet package.