How to Connect a Portable Generator to an RV

Place the Generator Outside, Away from Openings

Carbon monoxide from a portable generator is invisible and odorless. The U.S. Consumer Product Safety Commission warns that one generator can produce as much CO as hundreds of cars, and it can incapacitate and kill within minutes. Always run the generator outdoors, far from windows, doors, vents, and any other opening into the RV or nearby buildings.

The U.S. Centers for Disease Control and Prevention recommends operating a generator more than 20 feet from any window, door, or vent, with the exhaust facing away. Even with the RV door closed, CO can seep in through vents and cracks. A battery-powered CO detector with battery backup inside the RV provides an extra layer of protection.

• Never operate a generator inside an RV, garage, basement, or shed.
• Keep the generator at least 20 feet from the RV and any other structure.
• Point the exhaust away from the RV and any neighboring campers.
• Install a CO detector inside the RV and check its batteries regularly.

Know Your RV's Shore Power Inlet and Power Needs

Every RV that can plug into campground power has a shore power inlet, usually a recessed receptacle on the exterior. The inlet has a specific amperage rating and a corresponding plug shape. Before buying a generator or cord, check the rating on the inlet or in your owner's manual. This number tells you the maximum current the RV can draw.

Then estimate the loads you will run: the air conditioner, refrigerator, converter, and electronics. Add their running watts and consider starting watts for the air conditioner. For a guide to sizing, see what size generator for home backup and how many watts do I need.

The generator you select must be able to supply at least that load, and ideally with some headroom. RV ready generators are often pre-configured with the correct outlets.

Choose the Right Generator and Cord

A generator shuts off on a cord that is too small for the current. The cord must be rated for the amperage your RV draws. For most RVs, that means a heavy-duty cord with a gauge suitable for the length. The longer the run, the thicker the conductor you need. See extension cord ampacity and cord gauge and length for details.

Select a cord with the correct connector on each end. The generator side might be a 120V twist-lock or a 240V outlet, while the RV side is almost always the shore power plug. If the shapes do not match, use an adapter that is rated for the full current. For a tour of common outlet types, read generator outlet types.

Inverter generators are a popular choice for RVs because they produce clean, stable power that is safe for sensitive electronics. They also tend to be quieter and more fuel efficient. See best RV ready inverter generators and how inverter generators work.

Match Plugs and Use Adapters Correctly

Adapters let you connect a generator outlet to an RV inlet of a different shape, but they only work if they are rated for the current. A 30-amp RV inlet cannot draw through a 20-amp adapter without tripping the breaker or overheating. Always read the labels and confirm the adapter is rated at least as high as the RV's inlet rating.

Do not use a series of adapters to step down or up repeatedly. One correctly rated adapter is safer than a chain. If the generator lacks the appropriate outlet entirely, consider a generator with the right outlet configuration or a different power setup. For a deeper look at RV-ready outlets, see generator RV-ready outlets.

Never plug a generator into a standard household outlet in the RV and then backfeed the RV's internal wiring. That is a serious hazard to you and anyone working on the power grid. Use only the dedicated shore power inlet.

Step-by-Step Connection

Follow this sequence each time you connect a portable generator to your RV.

First, position the generator in an approved outdoor location, at least 20 feet from the RV and any openings, with the exhaust pointing away. Next, connect the extension cord to the generator outlet, making sure the connector is fully seated and locked. Then connect the other end to the RV's shore power inlet, again ensuring a snug fit.

Start the generator and let it warm up for a minute. If your RV has a transfer switch, switch it from shore power to generator. Otherwise, simply plugging in energizes the RV. Finally, check the RV's power panel to confirm the incoming voltage is present and stable.

Common Mistakes to Avoid

The most common errors are operating the generator indoors, using an undersized cord, and backfeeding through the RV's internal wiring. All of these can cause serious injury or damage.

Another mistake is overloading the generator. Know the running and starting watts of appliances you plan to run. The generator's rated watts are the continuous output; its maximum watts are for brief surges. Manage the load by starting the air conditioner before other heavy loads.

Finally, do not forget the CO detector. It is a small device that can save your life. Check the batteries before each trip.

Consider an Inverter Generator for RV Use

If you are shopping for a generator specifically for RV trips, an inverter generator is often the best fit. It produces a stable sine wave that is safe for laptops, phones, and the RV's converter. It also runs at lower RPMs under light load, which reduces noise and fuel consumption.

Inverter generators are available in many sizes, from small units that power a single air conditioner to larger dual-fuel models. See the best inverter generators and best portable generators for current options.

What to pick for your use

Questions

Can I run a generator inside my RV?

No. Carbon monoxide from a generator is deadly and can kill you in minutes. Always run the generator outside, at least 20 feet from any window, door, or vent, with the exhaust pointing away.

Do I need a special cord to connect a generator to my RV?

Yes, you need a heavy-duty extension cord rated for the amperage your RV draws. It must have the correct connectors on both ends to match the generator outlet and the RV shore power inlet.

Can I use an adapter to connect a 30-amp RV to a 50-amp generator?

Yes, as long as the adapter is rated for the current and the generator can supply the power. However, the adapter must be rated for at least the RV inlet's amperage, and you should avoid stacking multiple adapters.

What is backfeeding and why is it dangerous?

Backfeeding is plugging a generator into a standard household outlet to energize the home or RV wiring. It can shock utility workers and bypass safety circuits. Always use the dedicated shore power inlet instead.

Should I use a CO detector when using a generator at the RV?

Yes, always install a battery-powered CO detector inside the RV. The CPSC and CDC recommend having one when operating any fuel-burning appliance, including portable generators.