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Choosing the best dual fuel generator comes down to one practical question: what happens when your main fuel runs short? A dual fuel unit can run on gasoline for convenience and switch to propane when gasoline is stale, scarce or hard to store, which makes it a common choice for home backup, job sites and RV use. The selection criteria below focus on running time on each fuel, rated power versus starting power, noise levels in dBA, portability, and the quality of the engine and brand support. Each pick is based on manufacturer specifications, brand reputation and common owner feedback patterns. We did not run these units ourselves.
Our Top Picks
Quick Comparison
| Product | Best for | Key feature |
|---|---|---|
| Champion 3800-Watt Dual Fuel Inverter Generator | Quiet home backup and camping | Inverter output with electric start |
| Generac GP3600 Dual Fuel Portable Generator | Budget-minded home backup | Easy switch between gasoline and propane |
| DuroMax XP13000EH Dual Fuel Generator | Whole-home backup and job sites | High rated output with electric start |
| Westinghouse iGen4500DF Dual Fuel Inverter Generator | RV and light-duty electronics | Clean sine wave output in a compact frame |
| Champion 12000-Watt Dual Fuel Portable Generator | Heavy loads and extended outages | Large rated capacity for major appliances |
Champion 3800-Watt Dual Fuel Inverter Generator
This suits owners who want quiet, clean power for campsites, tailgating or small household loads like a refrigerator, lights and a few electronics. The inverter design lets engine speed drop when the load is light, which is the main reason inverter models run quieter than conventional open-frame units.
Key specs
- Rated output around 3,100 watts on gasoline and propane, with higher peak output for starting loads
- Inverter-type electronics producing low total harmonic distortion, suitable for sensitive devices
- Electric start with a recoil backup
- Fuel runtime varies by load and fuel; check the manufacturer’s chart for your setup
Pros
- Inverter operation keeps noise lower at partial loads than many conventional generators
- Compact and lighter than most dual fuel units in its class
- Electric start simplifies cold-weather use
Cons
- Limited capacity for central air conditioning or well pumps
- Propane runtime is shorter than gasoline runtime on a given tank size
Generac GP3600 Dual Fuel Portable Generator
This is a good fit for homeowners who want a straightforward backup unit for essential circuits during short outages. Generac is a long-established name in standby and portable power, and the GP line is widely stocked, which makes parts and service easier to find.
Key specs
- Rated output around 3,000 watts on gasoline and about 2,700 watts on propane
- Conventional open-frame engine design
- Switch between fuels without rewiring, using the fuel selector
- Usually includes an electric start option on the sold configuration
Pros
- Strong brand support and parts availability
- Simple fuel switching for mixed fuel supply
- Suitable for powering a refrigerator, sump pump and lights
Cons
- Conventional design is noticeably louder than inverter models at similar output
- Heavier than inverter units, so less convenient to move
DuroMax XP13000EH Dual Fuel Generator
This suits owners who need higher rated output for larger homes, job sites or workshops with power tools. It is a conventional, not inverter, design, so it is better matched to heavy loads than to quiet operation.
Key specs
- Rated output around 10,000 watts on gasoline and about 9,000 watts on propane, with higher peak output
- Electric start is standard on this model
- Large fuel tank with runtime that depends heavily on load
- Wheel kit and handles on many configurations for relocation
Pros
- High capacity for whole-circuit or heavy tool loads
- Electric start reduces effort in cold weather
- Good value per watt for owners who need large output
Cons
- Noise is significantly higher than inverter units, so placement and sound barriers matter
- Heavy and bulky for one person to move on rough terrain
Westinghouse iGen4500DF Dual Fuel Inverter Generator
This is aimed at RV owners and light-duty home users who want an inverter-grade, parallel-capable unit that runs clean enough for modern electronics. Its compact frame suits tight storage and travel.
Key specs
- Rated output around 3,700 watts on gasoline and about 3,400 watts on propane
- Inverter electronics producing a clean sine wave output
- Parallel capability with a matching unit for higher combined output, per manufacturer specifications
- Electric start on the dual fuel configuration
Pros
- Clean power suited to laptops, phones and medical-grade electronics that call for stable waveform
- Parallel option gives room to grow
- Compact footprint for RV and van storage
Cons
- Output is not sufficient for central air conditioning on its own
- Parallel setup requires a matching unit and the correct cable, which adds cost and complexity
Champion 12000-Watt Dual Fuel Portable Generator
This is for owners who need substantial backup for multiple appliances, a well pump and a refrigerator during extended outages. It is the most powerful pick here and is best suited to fixed placement with proper ventilation.
Key specs
- Rated output around 9,500 watts on gasoline and about 8,500 watts on propane, with higher peak output
- Electric start with a large battery requirement; confirm battery specification before use
- Large fuel capacity for extended runtime at moderate load
- Wheel kit for relocation on flat surfaces
Pros
- Enough capacity for many whole-home essentials
- Dual fuel gives flexibility during extended outages
- Strong value for high rated output
Cons
- Loud at full load; expect noise levels that require sound-reduction planning
- Very heavy and not practical for frequent moving
Buying Guide
Selection criteria for a dual fuel generator
Start with the loads you need to run, not the generator’s maximum watts. Add up the running watts of each appliance, then add the starting surge of motor loads like refrigerators, well pumps and air conditioners. A unit with enough continuous output and sufficient surge capacity will run reliably, while an undersized unit will trip or stall.
Important features to look for
- Inverter or conventional design: Inverter units reduce engine speed at light loads and produce cleaner power. Conventional units are cheaper per watt and better for heavy loads, but louder.
- Electric start: Helpful in cold weather and for heavy units where recoil starting is difficult.
- Fuel selector and switching: Confirm the unit can switch fuels with the engine off and without rewiring.
- Runtime charts: Read the manufacturer’s runtime chart for both gasoline and propane at 25%, 50% and 75% load.
- Outlets and monitoring: Check for GFCI outlets, a voltage display and low-oil shutdown.
Specs to check before buying
- Rated versus peak watts: Rated output is what the unit can sustain. Peak output is short-term surge.
- Fuel consumption: Gasoline and propane consumption differ; propane usually gives a shorter runtime per tank at the same load.
- Noise rating in dBA: Compare measurements taken at the same distance, usually 23 feet (7 meters). See the related guides for how to compare noise ratings fairly.
- Weight and wheel kit: Heavy units need a wheel kit and a flat path to move safely.
For noise specifics, see Generator Decibel Ratings Explained: What dBA Numbers Mean and How to Compare Generator Noise Ratings Fairly.
Choosing by need
- Quiet use, camping or light loads: Choose an inverter model in the 3,000 to 4,000 watt class.
- Essential home circuits: A conventional 3,000 to 5,000 watt unit with electric start is a practical match.
- Whole-home or heavy tool loads: Look at 10,000 watt and higher conventional units, and plan for sound barriers and placement.
- RV or sensitive electronics: Choose an inverter unit with clean sine wave output.
If you are comparing quiet inverter options, see Best Quiet Inverter Generators: 5 Compared by Rated Noise and How Inverter Generators Reduce Noise.
Things to watch out for
- Propane tanks and gasoline should be stored and used outdoors, away from windows and doors, because the exhaust contains carbon monoxide.
- Stale gasoline can damage carburetors. Propane avoids this problem, but a gasoline-only fallback still needs fresh fuel.
- Check placement rules for campgrounds and neighborhoods before running a unit close to other people; see Generator Noise Rules at Campgrounds, Parks and Neighborhoods.
- Read Where to Place a Generator for Less Noise and Safe Exhaust before connecting a generator to your home’s electrical system.
Connecting a generator to household wiring should be done through a transfer switch installed by a licensed electrician. Consult a professional before any permanent installation.
FAQ
What does dual fuel mean on a generator?
A dual fuel generator runs on either gasoline or propane. You switch between the two with a fuel selector, and most models can run on either fuel at any time, provided the correct fuel supply is connected.
Is propane or gasoline better for a dual fuel generator?
Propane stores indefinitely and burns cleaner, which helps with fuel shelf life. Gasoline is easier to find in many places and usually gives a longer runtime per tank. Many owners keep both on hand.
How many watts do I need for a home backup generator?
Add the running watts of the appliances you want to power, then add the surge needed to start motor loads. For essential circuits, a 3,000 to 5,000 watt unit is common. Whole-home backup usually requires a much larger unit or a standby system.
Are inverter dual fuel generators quieter?
Yes. Inverter designs adjust engine speed to match the load, so they usually run quieter at partial loads than conventional open-frame units. Full-load noise is still significant on any model.
Can I run a dual fuel generator in the garage?
No. Generators produce carbon monoxide and should be operated outdoors, away from doors, windows and vents. Even with the garage door open, exhaust can build up dangerously.
How long does a propane tank last on a dual fuel generator?
Runtime depends on tank size, load and the generator’s fuel consumption rate. Check the manufacturer’s runtime chart for your model rather than relying on general estimates.
Do I need a transfer switch?
If you want to connect a generator to your home’s wiring, a properly installed transfer switch is the safe method. Plugging a generator into a dryer outlet or using a backfeed cord is dangerous and can injure utility workers. Consult a licensed electrician.
Conclusion
The best dual fuel generator for you depends on the loads you need to run and how much noise you can tolerate. For quiet camping and light home loads, the Champion 3800-Watt Dual Fuel Inverter Generator and the Westinghouse iGen4500DF fit well, especially for RV owners. For essential home circuits, the Generac GP3600 offers strong brand support. For whole-home or heavy tool loads, the DuroMax XP13000EH and Champion 12000-Watt model provide the capacity, but plan for significant noise and proper placement. Match the rated output to your real load, confirm the runtime on each fuel, and check local noise rules before you buy.
