Okay, let's break down why running your 120/240V RV on a single 120V 30A supply, using only one leg, could be problematic even though you think you don't have any 240V loads running.

Why it Seems Okay On the Surface



No 240V Appliances

You're right, if you genuinely don't have any appliances that require 240V (like a dryer or some water heaters, though RVs often run those on propane anyway), then you're not immediately going to trip breakers or damage anything by only providing 120V.

Lights and Plugs Work

Running a single leg provides 120V power to half your panel, so your 120V circuits for lights, outlets, and some smaller appliances will function.

Why It's a Bad Idea (Potentially)


Load Balancing in the RV Panel

RV panels are designed with the assumption that you'll have roughly equal loads distributed across both legs. When you only power one leg:

Overloaded Side

You're potentially overloading the one leg of the panel that's being fed. Even if you don't think you're drawing a lot of power, all your active circuits are now pulling from the same 30A source. This dramatically increases the risk of tripping that 30A breaker.

Unbalanced Neutral

More importantly, this creates an unbalanced neutral load. The neutral wire carries the return current for both legs of the circuit. By only using one leg, you are forcing the neutral to carry nearly the entire current load of your RV.2.

Burned up wiring

In the event of excessive current on the neutral wire there will be a voltage drop creating heat, this excess heat can create hot spots and burn through the insulation on the wires. This in turn can create electrical shorts which would not be good at all.3. Hidden/Unaccounted-For Loads

You might be mistaken about not having any 240V loads. Some RV appliances, even though they can run on 120V, might have elements or parts that could be partially wired for 240V operation in certain modes (especially in higher-end RVs). This is less likely, but worth considering.4.

Appliance Damage (Potentially)

While less likely, some appliances designed to expect a balanced 120/240V system could be stressed or have their lifespan reduced by being forced to operate on a significantly unbalanced supply for extended periods.

How to Mitigate (If You Must Run This Way)



Be Extremely Careful About Load Management



Monitor Amp Draw

Ideally, use a clamp meter to actually measure the current on that single 30A leg you're using. See how close you are to the limit.

Avoid Simultaneous Use

Don't run high-draw appliances at the same time (e.g., microwave, hair dryer, space heater).

Use Propane Where Possible

Run your water heater, refrigerator, and furnace on propane instead of electric if you have that option.

Properly Size and Connect

Double-check that your adapter and wiring are correctly sized and rated for 30A. Ensure all connections are tight and secure.

In Summary

While it might seem like it will work, feeding a 120/240V RV with only one leg of a 120V 30A supply introduces a significant risk of overloading the circuit, creating an unbalanced neutral, and potentially damaging wiring or appliances. It's

strongly recommended to avoid this setup if at all possible.What you should do instead


Talk to the Campground Management

Explain your situation and see if there's any* way they can make the 50A service available to you. They might be able to run a longer cord, move you to a different site, or offer some other solution.2.

Use a Generator

If you have a portable generator, especially one capable of outputting both 120V and 240V, that's a much safer and more reliable option.3.

Find a Different Campground: If neither of the above is feasible, consider finding a campground with a site that has the correct electrical service for your RV.Your safety and the longevity of your RV are worth the effort! Flag for review