Onboard vs. Portable Inverter Generators: Which is Right for Your RV?
Should you rely on a built-in powerhouse or buy a standalone, portable unit? This in-depth comparison pits onboard RV generators against portable inverter generators to help you make the smartest buying decision
Planning to camp off-grid? Discover the differences between onboard and portable RV generators, how much power you actually need, and how to choose the right fuel.
Onboard Generators: The "Built-In Powerhouse"
If you love convenience and want a "set-and-forget" power source, an onboard generator is the way to go.
The Set-and-Forget Source: These generators are permanently integrated directly into your RV's chassis and electrical system, meaning you never have to haul heavy external units or mess with extra power cords.
How It Works: They feed directly off your RV's main fuel tank, whether your rig runs on gasoline, diesel, or propane. With a simple push of a button from your indoor control panel, the generator fires up and starts producing electricity.
Why It Matters: Onboard units offer incredible convenience. You can easily run your air conditioners to keep the cabin cool while driving down the highway, and you never have to worry about protecting your generator from rain, snow, or wind.
High-Wattage Power: They typically deliver massive power, ranging from 4,000 to over 12,500 Watts, allowing you to run multiple high-draw appliances simultaneously.
Where to Find It: These are standard features on most motorhomes (Class A, B, and C) and high-end fifth wheels.
Portable Inverter Generators: The "Quiet Powerhouse"
If you tow a travel trailer or a pop-up camper, a portable inverter generator is likely your best friend. They have quickly become the darling of modern campgrounds, and for good reason.
The Campground Darling: Portable inverter generators offer maximum flexibility for towable RVs.
How It Works: Unlike old-school, open-frame generators that are incredibly loud and produce unstable electricity, inverter generators are highly sophisticated. They electronically throttle their engine speed up and down to match your real-time electrical demand. They also digitally refine the power by converting AC to DC, and then back to an ultra-clean AC sine wave.
Why It Matters: This digital refinement provides "clean" electricity that is safe for sensitive electronics like your laptop, smartphone, and smart TV.
Quiet and Efficient: Because they throttle down when power demand is low, they are exceptionally fuel-efficient, lightweight, and run so quietly they won't disturb you or your camp neighbors.
Where to Find It: These are standalone units from reputable brands like Honda, Champion, or Cummins that you can easily pack in your truck bed or RV storage compartment.
The Power Duo in Action: Generator & Transfer Switch
Have you ever wondered how your RV knows to switch from battery power to generator power without blowing a fuse? It all comes down to a coordinated dance between your generator and your RV's internal electrical system.
You fire up the generator: When you hit the start button, the generator's engine roars to life, spinning its alternator to produce raw AC electricity.
The "Brain" monitors the line: Your RV's Automatic Transfer Switch (ATS)—which is a combined controller and relay system—acts as the safety supervisor. It waits a few seconds for the generator's power output to fully stabilize.
The "Muscle" snaps shut: Once the ATS controller verifies that the power is stable, it triggers a heavy-duty internal relay. This relay physically switches your RV's power source from "shore power" to "generator power," safely routing electricity directly to your AC, microwave, and outlets without any risk of dangerous back-feeding.
Finding Your Fuel: Gas, Propane, or Diesel?
The fuel your generator runs on will impact how you travel, store your rig, and maintain your equipment.
Gasoline: This is the most common fuel for portable units. It’s incredibly easy to find at any local gas station. However, gas doesn't store well long-term, so you'll want to use a fuel stabilizer if your rig sits unused for long periods.
Propane (LP): Propane is an incredibly clean-burning fuel that has an almost infinite shelf life. Best of all, LP generators can tap directly into the propane tanks already mounted on your RV. Many modern portable generators are now "dual-fuel," giving you the flexibility to run on either gasoline or propane.
Diesel: This is the gold standard for large, luxury Class A diesel-pusher motorhomes. Diesel generators are highly efficient, extremely durable, and conveniently draw fuel directly from your motorhome's main diesel tank.
Sizing It Up: How Much Power Do You Need?
Before you purchase a generator or try to run every appliance in your rig, you need to understand its wattage capacity.
2,000 to 2,400 Watts: This is perfect for small travel trailers. It will easily run your lights, charge your devices, and power a small TV. However, it cannot run a standard RV air conditioner unless you pair it in parallel with a second generator.
3,500 to 4,500 Watts: This is the sweet spot for the majority of RVers. A generator in this range provides enough power to start and run a single 13,500 or 15,000 BTU air conditioner, while still leaving enough headroom for smaller appliances.
5,500+ Watts: Designed for larger fifth wheels and motorhomes, this heavy-duty power level allows you to run dual air conditioners, the microwave, and your water heater all at the same time.
Ready to Power Your Adventures?
Whether you are boondocking in the quiet depths of a national forest or running your air conditioner during a quick lunch break at a highway rest stop, understanding your generator is the key to a stress-free trip. Knowing your generator type, fuel source, and power limits ensures your home-on-wheels stays fully powered and running smoothly.
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