The DuroMax XP13500iH is a dual fuel inverter generator built for home backup power, jobsites, and off-grid or recreational use where clean, quiet power matters more than raw size. Model XP13500iH delivers 13,500 peak watts and 10,500 running watts on gasoline, or 12,750 peak watts and 10,000 running watts on propane, from a 550cc DuroMax 4-stroke OHV engine. Running on either fuel means you're covered whether gas stations have lines out the door after a storm or your propane exchange is picked clean — whichever one you can get, this generator runs on it.

Inverter generators are valued for clean output, and the XP13500iH holds total harmonic distortion under 3% on both fuel types. That's the difference between a generator that's safe to run a refrigerator compressor board, a sump pump controller, or a laptop charger on, versus one that can quietly damage that equipment over months of use on dirty power. A demand-based variable idle system throttles the engine to match the connected load rather than running at full speed regardless of draw, which is how noise stays under 66 decibels at 25% load.

Starting is push-button electric from the panel or the included remote control, with a recoil pull-start as backup if the battery is ever down. The 12-volt AGM battery ships installed, along with a battery tender to keep it charged between uses — solving the dead-battery problem that shows up on generators that sit unused for months between storms. An automatic low-oil shutdown protects the engine from running dry, and a built-in carbon monoxide sensor cuts the unit off if CO builds up in an enclosed space.

The power panel carries two 5-20R household outlets, a 30-amp L14-30R twist-lock for RV shore power, and a 50-amp 14-50R outlet for home backup through a transfer switch or interlock kit, with GFCI protection on every outlet. DC output with included cables extends the generator's use to charging 48V and 52V battery banks. A digital voltmeter, hour meter, and fuel gauge on the panel keep output and maintenance visible at a glance, and the whole unit rides on a metal-hub wheel kit with a fold-down handle so a generator in the 234 lb range is still one person's job to move.

This is the right generator for a homeowner who wants dependable whole-home backup without committing to a natural gas hookup, for a contractor who needs clean power on a trailer, or for anyone who wants gasoline and propane covered in one unit rather than one. DuroMax backs it with a 5-year parts and technical service warranty and a nationwide network of service centers.

The Straightforward Dual Fuel Backup

The XP13500iH is the pick for whole-home backup if you'd rather keep things simple with gasoline and propane than deal with a natural gas hookup.

• Who it's for: Homeowners who want dependable whole-home backup power, contractors who need clean power on a trailer, and anyone who doesn't want to mess with a fixed natural gas line.
• Why it stands out: Sub-3% THD and under-66 dB operation put it in a different class than a bargain-bin dual fuel unit — this one won't damage your electronics or wake up the block.
• Worth knowing: If you want a third fuel option and might tap into natural gas someday, the sibling XP13500iHT adds that capability for the same core wattage.

• Does it come with a battery? Yes, a 12V AGM battery is included along with a battery tender to keep it charged in storage.
• Can I run this on natural gas? No, the XP13500iH runs on gasoline or propane only. The XP13500iHT sibling model adds natural gas as a third fuel option.
• Can I use this for home backup without a transfer switch? The 14-50R 50A outlet is designed to connect to an interlock kit or transfer switch for backing up circuits in your home; a transfer switch or interlock kit is not included and is sold separately.
• How long will it run on a full tank? On gasoline, expect about 19.9 hours at 25% load or 10.8 hours at 50% load. On a 40 lb propane tank, expect about 16.9 hours at 25% load or 9.2 hours at 50% load.