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Open Roads Forum  >  Travel Trailers  >  General Q&A

 > how long of a 12 ga extension cord is safe to use

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mo

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Posted: 04/03/21 07:32pm Link  |  Quote  |  Print  |  Notify Moderator

our daughter she would help us when we go visit her with our class C. she installed a singles 30 amp rv plug in at the side other house for us to use. problem is the outlets almost 100 feet
away from where we park. because of power loss from distance, I'm afraid that it will not work from that distance even if we only have fridge and ac running- would turn off ac if need to use microwave. any advice ? thanks. chuck

Ed_Gee

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Posted: 04/03/21 08:01pm Link  |  Quote  |  Print  |  Notify Moderator

Without AIr Condx I have often used 2 50' 12Ga extension cords with no problems on my 30A RV. If possible, you might try using 1 50' 12 gage cord to your RV's shore power cord ... which is 10 gage.... if it will reach.


Ed - on the Central Oregon coast
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RichB3125

Beavercreek, OH

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Posted: 04/03/21 08:08pm Link  |  Quote  |  Print  |  Notify Moderator

Buy three 30A extension cords plus the one on the rv. Then you should not have any problems unless you really overload the system.

Rich

theoldwizard1

SE MI

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Posted: 04/03/21 08:12pm Link  |  Quote  |  Print  |  Notify Moderator

I would use a 10 gauge cord AND a Micro Air EZ Start on the AC.

pianotuna

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Posted: 04/03/21 08:20pm Link  |  Quote  |  Print  |  Notify Moderator

Hi,

You have correctly identified voltage drop as a problem. #10 wire may not be enough to solve this issue.

On 30 amps, it is not advised to run the air conditioner and microwave at the same time.

The best solution may be an autoformer. See my signature for the one I use. If you have a friend who travels to Mexico--they are an off the shelf item.


Regards, Don
My ride is a 28 foot Class C, 256 watts solar, soon to have SiO2 batteries, 3000 watt Magnum hybrid inverter, Sola Basic Autoformer, Microair Easy Start.

JRscooby

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Posted: 04/04/21 06:28am Link  |  Quote  |  Print  |  Notify Moderator

When thinking about voltage drop you need to also think about how long is the run from breaker to outlet.
My AC has a 20 AMP plug on the cord. When I want to run AC when not plugged into a 30 Amp, I don't plug in the trailer, I plug in the AC

GrandpaKip

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Posted: 04/04/21 08:17am Link  |  Quote  |  Print  |  Notify Moderator

I have a total 110’ run from breaker to trailer using 10 gauge solid wire and the trailer’s 10 gauge cord set.
There is usually 120-122 volts with small loads and a 4 volt drop with the a/c running. I only tested the a/c once and didn’t see the initial drop as the a/c started. I have no need to run the a/c in the trailer at home as I don’t have any a/c in the house.
I have an EMS, so I really don’t worry too much about voltage drops.
I would not run any less than 30 gauge that far unless you are just going to have a small (10 A or so) load.


Kip
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time2roll

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Posted: 04/04/21 10:09am Link  |  Quote  |  Print  |  Notify Moderator

Before you plug in verify the 30 amp connector is 120 volts fed by a single breaker. Also check polarity. Notorious for being wired wrong.

Get a 100' extension. Check your running voltage the first few days. 108+ is fine. Some dip at start up is ok.

For best power get or make an extension with 30 amp connectors and #10 wire.


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jdc1

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Posted: 04/04/21 10:21am Link  |  Quote  |  Print  |  Notify Moderator

This sounds like a $600 mistake waiting to happen.

CA Traveler

The Western States

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Posted: 04/04/21 10:28am Link  |  Quote  |  Print  |  Notify Moderator

STOP DO NOT USE THAT PLUG until you are absolutely sure that it's a correctly wired 120V 30A RV plug. RVers that have plugged into one that was wired for 240V let their smoke out. And that includes ones installed by an electrician. The 30A RV plug is NOT a common household plug and installers make assumptions.

Buy 75' of 30A RV extension cords ($100+ on Amazon) and you will be OK based on your plan. Since the house wiring and voltage is unknown plug in a digital voltmeter and check the RV voltage as you turn on loads.


2009 Holiday Rambler 42' Scepter with ISL 400 Cummins
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2014 Grand Cherokee Overland

Bob


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