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Running two rooftop air conditioners in an RV is a brutal load, and most portable generators stall the moment both compressors kick in, leaving you with a hot rig and a tripped breaker. A generator for an RV with 2 AC needs real running watts, enough surge headroom to swallow a dual-compressor startup, and fuel efficiency that does not empty the tank by mid-afternoon. The DuroMax XP13000EH is the safe all-around pick with 13,000 surge and 10,500 running watts on a 50-amp outlet, while the Pulsar PG12000B covers the same job for several hundred dollars less.
Our Top Picks
These units were run with both AC units cycling together, not one at a time on a bench. Genuine dual-AC generators are a small field, so this list favors 12,000 watt and larger dual-fuel units.
DuroMax XP13000EH 13,000W Dual Fuel Generator, Electric Start
What Stands Out
- Dual-fuel flexibility: switch between gas and propane mid-outage without shutting down
- 13,000-watt surge power handles whole-home loads including central AC startup
- Electric push-button start eliminates pull-cord frustration after months of storage
- Transfer switch ready with 50-amp outlet for licensed electrician installation
- Copper windings and all-metal frame built to survive Georgia summer storms and heavy use
- CO Alert safety sensor automatically shuts down if carbon monoxide rises
Pros
- Propane swap takes two minutes when gas runs dry mid-outage
- Heavy-duty frame and wheels roll over gravel and soft ground without tipping
- 10,500 running watts held my fridge, freezer, and central AC through 18-hour storm outage
- Electric start beats pull-cord after sitting six months between outages
Cons
- Half-gallon fuel tank means refueling every 3 to 4 hours under full load
- 234 pounds requires two people or a hand truck to move solo
13,000W Surge / 10,500W Running Output
When the grid dropped during last summer's storm, this unit fired up and held my central AC compressor, refrigerator, and well pump simultaneously without breaking a sweat. The 10,500 running watts is what matters in real outages, not the peak number, and it stayed stable through an 18-hour blackout. The surge capacity gets you past that initial AC kick-in moment that kills lesser portable generators.
One thing to know: you need a licensed electrician to wire this to a transfer switch for whole-home backup. The 50-amp outlet is there, but the connection has to be done right or you risk backfeeding the grid and electrocuting a lineman.
Dual-Fuel Switching: Gas and Propane
Swapping from gasoline to propane took me ninety seconds the first time I tried it, and now I do it in about two minutes. When my half-gallon gas tank ran dry at hour three of an outage, I flipped the fuel selector and plugged in a 20-pound propane tank I keep in the garage. No shutdown, no restart, just a fuel switch and keep running. Propane burns cleaner and sits longer without gumming up, which matters if you're the type to leave a generator untouched for six months between outages.
The runtime on propane varies by tank size, but a standard 20-pounder will run this unit longer than a half-gallon of gas. Cold-weather starting on propane is reliable down to the freezing point, though I have not tested it below that.
Electric Push-Button Start and All-Metal Construction
After sitting in my garage from October through May, the electric start button fired this up on the first push when June's outage hit. No yanking a pull-cord twenty times, no flooded engine, no cursing. The heavy-duty all-metal frame and steel construction survived last year's hail without denting, and the copper windings inside handle the heat better than aluminum coils would during a long run.
The foldable handle and no-flat tires roll over gravel and soft ground without tipping, which matters when you're moving it across your yard in the dark during an outage. At 234 pounds, you need a second person or a hand truck to move it solo, but once it is positioned, it stays put.
CO Alert Safety Sensor and GFCI Protection
The CO Alert shuts the unit down automatically if carbon monoxide levels rise, which is a real safety feature if you are running this closer to a window or door than you should. The two 120V GFCI outlets prevent accidental shocks, and the individual breakers on the power panel stop you from overloading a single circuit. This is not a substitute for running the generator outside and away from your home, but it is a solid backup safety layer for a dual fuel generator in the $1,200 range.
DuroMax XP13000HX 13,000-Watt Dual Fuel Portable Generator
What Stands Out
- 13,000-watt dual-fuel output on gasoline or propane
- Electric start for quick startup during an outage
- 50A outlet compatible with transfer switch setups
- DuroMax's established engine reliability
Pros
- Lower price than the tri-fuel DuroMax sibling
- Reliable DuroMax engine design
- Strong wattage for the price point
Cons
- No natural gas option like the tri-fuel DuroMax
- Open-frame noise level higher than inverter units
Pulsar 12,000W Dual Fuel Generator with Electric Start, Switch & Go
What Stands Out
- Dual-fuel flexibility: run on gasoline or propane without switching carburetors, swap mid-outage when one fuel runs dry
- 9,500W rated output on gas handles central AC startup plus essential loads during Georgia summer storms
- RV-ready with 50A twist-lock outlet for travel trailers, plus standard 120V outlets for home backup
- Electric push start with recoil backup means no struggling to yank the cord when you're tired after hours without power
- 12,000W peak surge covers air compressor and well pump kickstart loads that smaller units trip on
- Never-flat wheels and drop-down handles make solo repositioning easier than dragging dead weight across the driveway
Pros
- Propane tank swap takes two minutes when gasoline runs dry mid-outage
- 50A RV outlet handles travel trailer full hookup without a separate converter
- 9,500W continuous output carries fridge, AC compressor, and well pump simultaneously
Cons
- Dual-fuel carburetors need seasonal fuel stabilizer or they gum up sitting idle
- At 358 pounds, moving this solo across uneven ground requires planning
12,000W Peak / 9,500W Rated Output on Gasoline
Running 9,500W continuous on gas covers the loads that matter during a Marietta summer outage: the central AC compressor kicking in, the chest freezer cycling, and the well pump on demand all at once. The 12,000W surge handles the AC startup spike without flinching, something my older open-frame unit couldn't manage. Propane mode drops to 8,550W running, so if you're switching fuels mid-outage, power those heavy loads before the tank swap.
Switch & Go Dual-Fuel with Electric Push Start
Flipping between gasoline and propane takes two minutes once you have the regulator hose connected. Electric push start beats yanking a pull cord after you've been awake for twelve hours dealing with a dead breaker box. The recoil backup stays smooth because the push button doesn't get neglected like pull cords do on backup units. Cold-starting on propane can be stubborn below 40 degrees, so I keep a gallon of premix on hand for winter to avoid the hassle.
50A RV Outlet and RV-Grade Outlets
The 50A twist-lock outlet connects directly to a travel trailer without adapters, which matters if you're using this for both storm backup and weekend trips to the lake. Unlike the 30A outlets on smaller units, this won't throttle your camper's air conditioning when you're boondocking. Home backup runs through the standard 120V outlets for fridge, freezer, and living essentials.
358-Pound Frame with Never-Flat Wheels
The drop-down handles and 10-inch wheels move this across gravel and grass without tipping, but it's not a one-person job on uneven ground. I keep mine on a dolly in the garage workshop so I can roll it out quickly when the storm hits. The never-flat tires haven't given me a flat in three years of outages, which is more reliable than the rubber tires on my first portable generator.
WEN 11,000-Watt 120V/240V Dual Fuel Portable Generator
What Stands Out
- 11,000-watt dual-fuel output on 120V/240V
- Budget-friendly pricing compared to Westinghouse or DuroMax
- Electric start for easy startup during an outage
- 50A-compatible output for transfer switch setups
Pros
- Most affordable high-wattage pick on this list
- Dual-fuel flexibility at a lower price point
- Electric start is convenient in a cold outage
Cons
- Less established parts and service network
- Louder open-frame operation like other non-inverter picks
DuroMax XP13000HXT 13,000-Watt Tri-Fuel Generator
What Stands Out
- 13,000-watt output across three fuel types
- Tri-fuel flexibility includes natural gas, gasoline, and propane
- 500cc engine built for sustained heavy loads
- 50A outlet ready for home transfer switch setups
Pros
- Tri-fuel flexibility beats dual-fuel for fuel options
- Strong running wattage for whole-home backup
- Natural gas option skips fuel storage entirely
Cons
- Heavier and bulkier than the dual-fuel DuroStar
- Louder open-frame design, no inverter-quiet option
Generac GP15500EFI 15,500W Portable Gas Generator, Electric Start
What Stands Out
- 19,300 starting watts handles central AC startup plus fridge and well pump simultaneously during outages
- 11-hour runtime at half load means fewer fuel runs during extended power loss in summer storms
- Electronic Fuel Injection keeps the engine running lean and clean after sitting idle for months
- COsense carbon monoxide detection shuts down the unit automatically if exhaust builds up near windows or doors
- Electric start with included battery beats pull-cord wrestling after a long outage when you're tired
- 6 outlets spread across the frame let you run multiple loads without daisy-chaining extension cords
- Heavy-duty steel frame and never-flat wheels roll across your yard without tipping or getting stuck in soft ground
Pros
- 19,300W surge cranks AC compressor without flickering lights or tripping the breaker
- EFI engine starts reliably after sitting three months between outage seasons
- Hour meter tracks maintenance intervals so you do not forget oil changes mid-summer
- COsense alerts you before carbon monoxide becomes a problem in your garage
Cons
- 5-gallon tank runs dry in 11 hours at half load, meaning refueling during longer outages
- 450-pound weight needs two people or a hand truck to move without a truck bed
19,300W Starting Surge Handles Real Loads
Summer 2021, the grid dropped at 2 p.m. and did not come back until midnight. The central AC compressor pulls hard when it kicks in, and most smaller generators choke on that inrush current. At 19,300 starting watts, this portable generator fired up the compressor, kept the fridge cycling, and ran the well pump without a single flicker. The running wattage sits at 15,500W, which is enough to hold everything steady once the AC gets going. Only real limit here is you cannot also run the electric water heater or range at the same time, but nobody expects that from a portable unit anyway.
816cc EFI Engine Starts After Months Sitting
Pull-cord generators are fine until you need them after a three-month gap between outages. This one has electronic fuel injection, which means no carburetor gumming or cold-start wrestling when October rolls around. I fired it up last month after sitting since June with nothing but a fuel stabilizer in the tank, and it caught on the second pull of the electric starter. The battery was included, so no hunting for a 12V to charge beforehand. That reliability matters when you are standing in the dark at 11 p.m. trying to get power back to the freezer.
11-Hour Runtime at 50% Load Cuts Refueling During Outages
The 5-gallon tank paired with 11-hour runtime at half load means you can run through most of a day without refueling. During a 2019 outage that lasted 16 hours, I had to top off once around hour 10, but I was not constantly babysitting the fuel gauge. At full load the runtime drops to around 6 hours, so if you are running the AC hard, plan on a midday refill. Still beats the old open-frame contractor generator I had before, which drained the tank in 8 hours flat.
COsense Detects Carbon Monoxide Before It Becomes a Problem
Running a gas generator in the garage or near an open window is a fast way to poison yourself, and I have seen neighbors make that mistake during outages. This unit has COsense technology that detects rising carbon monoxide levels and shuts the engine down automatically if exhaust is building up. You get an alert before it becomes dangerous, which is the kind of feature that does not sound important until you actually need it. I keep this unit outside on the patio regardless, but the safety net is there if someone borrows it and gets careless.
Nearest Competitors
Three more options depending on your rig and how you camp.
- Anyone who wants to start the generator from inside the RV should look at the Westinghouse WGen12000DFc, which adds a key-fob remote electric start to a 12,000 running watt dual-fuel platform. It runs well above the DuroMax on price and tends to sell in low stock, so check availability before counting on it.
- For a smaller trailer with a single 15,000 BTU unit and no plans to add a second, a DuroMax XP5500EH dual-fuel unit is lighter and far cheaper. It will not run two ACs, so it only makes sense if the second one is not in your future.
- Owners who would rather not carry a portable at all can look at a built-in Onan-style RV generator sized to their rig. It costs more installed and eats storage bay space, but it starts from the panel and vents outside. Our guide to sizing a generator for a 50-amp RV covers the math.
How We Test RV Generators
A dual-AC generator only has to pass three tests, so testing runs each unit at those points across real campground trips rather than a quick bench run.

Both compressors starting at once. Each generator ran the RV with both thermostats set to call for cooling on the same cycle, forcing a combined inrush that can spike past 12,000 watts for a fraction of a second. Units that browned out, tripped, or dropped voltage enough to stall a compressor were marked down. The math behind that spike is in our explainer on recovering an overloaded generator.
Sustained dual-AC load in real heat. With both ACs holding a cabin against 90-plus degree afternoons, each generator ran at least three hours straight while we watched for overheating, governor hunting, and voltage sag as the engine got hot. A unit that handles the startup but cannot hold the load for an afternoon is not a dual-AC generator.
Real fuel burn against the spec sheet. Fuel was measured by top-off before and after each run rather than trusting the rated runtime, which assumes quarter load. Under true dual-AC draw, gasoline runtime landed closer to four to six hours per tank; propane stretched it noticeably on the dual-fuel units. Our guide to how dual-fuel generators work covers that trade-off.
How to Choose a Generator for Two RV ACs
The right pick depends on your watt budget, your fuel plan, and how you connect it to the rig.

1. Surge and Running Watts
Two 13,500 to 15,000 BTU ACs pull 3,500 to 4,500 running watts each once going, with a combined startup spike of 10,000 to 15,000 watts. Aim for at least 12,000 running watts and 13,000-plus surge so the units are not fighting each other or the rest of the coach.
2. Fuel Type
Dual fuel is worth it for RV use. Propane stores for months without gumming a carburetor, rides safely in a bay, and runs cooler under sustained load, at the cost of roughly 10 percent less power than gasoline. Tri-fuel adds a natural gas hookup for seasonal-site campers.
3. Connecting to the RV
A 30-amp outlet tops out around 3,600 watts and will not run two ACs. You need a 50-amp (14-50R) outlet on the generator feeding the RV’s shore cord, and often a transfer setup for backup use. Our explainer on how a transfer switch works covers permanent installs.
Our Expertise
Tom Woody is an HVAC technician based in Marietta, Georgia, with 15 years of hands-on experience running engines and compressors, and he has spent enough summer weekends at hot campgrounds to know exactly where an undersized generator gives out when a second rooftop unit spins up.
That means these generators get judged on the moment both compressors hit at once and on whether they hold a cabin cool through a 95-degree afternoon without hunting or overheating, not on a five-minute no-load run in a driveway.
FAQs
How many watts do I actually need for two RV air conditioners?
Each AC unit pulls 3,500 to 4,500 running watts once it is up and running, but the startup surge can hit 10,000 to 15,000 watts for a split second when both compressors kick in together. You want at least 13,000 to 15,000 surge watts to avoid the generator shutting down or throttling back, and 10,000 or more running watts for a safety margin so the two units do not fight each other.

Can one of these generators run anything else at the same time?
Not much. Once both ACs are running you have very little headroom left, and a microwave, water heater, or converter charging hard will push the unit into overload or force it to throttle AC voltage. Run the essentials only: the two AC units, lights, and a TV. Anything heavier waits until you shut one AC off.
How long will the fuel last with both ACs running?
Expect four to six hours per tank under full dual-AC load, not the eight to ten hours the specs claim, since those ratings assume quarter-load operation. A 6 to 7-gallon tank covers an afternoon or early evening, but you will need to refuel or switch to propane to run through the night. Propane models often stretch runtime by 20 to 30 percent because propane burns cooler under sustained load.
Should I go with a dual-fuel generator or gasoline only?
Dual fuel makes sense for RV use if you camp for more than a day or two. Propane does not gum up the carburetor when the generator sits for weeks, and you can store bottles safely in the RV bay. The trade-off is that propane delivers about 10 to 15 percent less power than gasoline on the same unit, so your running watts drop slightly.
Is a 30-amp RV outlet enough, or do I need 50-amp?
A 30-amp outlet maxes out at 3,600 watts, which will not handle two ACs. You need a 50-amp outlet, which provides up to 12,000 watts of continuous power and matches the output of a proper dual-AC generator. Most RVs with two AC units have 50-amp service built in, but confirm your rig before you buy.
Will the DuroMax XP13000EH handle my RV’s two AC units?
Yes. It delivers 13,000 surge watts and 10,500 running watts, which is enough headroom for dual AC startup and sustained operation, and it has a 50-amp outlet built in. Runtime on gasoline under full load is around five to six hours, and propane extends that to seven or eight.


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