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 > extension cord length

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scarecrow56

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Posted: 11/09/19 06:51am Link  |  Quote  |  Print  |  Notify Moderator

I'm gonna put my TT in the back yard. I have used a 50' extension cord to power the slides and fridge and a few other things including the AC for a short time. Question is, This time I'm gonna have to use a 100' cord. How will this affect the voltage/drain on the power, if at all?


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Dutch_12078

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Posted: 11/09/19 06:58am Link  |  Quote  |  Print  |  Notify Moderator

What size wire will the extension cord use? Is your TT 30 amp or 50 amp...


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wolfe10

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Posted: 11/09/19 07:03am Link  |  Quote  |  Print  |  Notify Moderator

Yup length AND wire gauge as well as load will determine whether your voltage drop is acceptable or "will let the smoke out" of you 120 VAC appliances.

If all you are running is a battery charger, smaller gauge can be used. If you plan to run high amp items like a roof air, a VERY different matter.


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SoundGuy

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Posted: 11/09/19 07:24am Link  |  Quote  |  Print  |  Notify Moderator

scarecrow56 wrote:

I'm gonna put my TT in the back yard. I have used a 50' extension cord to power the slides and fridge and a few other things including the AC for a short time. Question is, This time I'm gonna have to use a 100' cord. How will this affect the voltage/drain on the power, if at all?


If at all? [emoticon] Obviously the greater the current draw the greater will be the voltage drop. You also haven't mentioned the gauge of cable you plan to use - again obviously, the lighter the gauge the greater will be the voltage drop. You haven't provided any of this information, including the unloaded source voltage, so no one here can tell you what voltage drop you can expect. Measure your unloaded source voltage and plug numbers into this voltage drop calculator.

Cummins12V98

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Posted: 11/09/19 07:56am Link  |  Quote  |  Print  |  Notify Moderator

12 ga at 15+amp draw is fine at 50'. 100' I would step it to 10ga.


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wnjj

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Posted: 11/09/19 09:18am Link  |  Quote  |  Print  |  Notify Moderator

It also depends upon how much wire there is in your house between the panel and the receptacle you’re using. Your best bet is to measure the voltage inside the RV with whatever appliances (e.g. A/C) running and step the cord gauge up if it’s not enough.

rhagfo

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Posted: 11/09/19 09:21am Link  |  Quote  |  Print  |  Notify Moderator

Cummins12V98 wrote:

12 ga at 15+amp draw is fine at 50'. 100' I would step it to 10ga.


X2
This will fill your needs,but at a price!

Voltec 100' 10/3 extension cord


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RJsfishin

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Posted: 11/09/19 09:43am Link  |  Quote  |  Print  |  Notify Moderator

I always listen to the A/C,....if it has a good normal startup, it will be fine.
If it struggles to get going, get larger wire.
We lived in our MH for 5 months on a 100 ft 12ga cord. We could use the AC or the microwave but not both at the same time


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rockylarson

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Posted: 11/09/19 09:48am Link  |  Quote  |  Print  |  Notify Moderator

Two 30amp RV extensions for under $120

* This post was edited 11/09/19 12:26pm by rockylarson *


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MitchF150

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Posted: 11/09/19 01:39pm Link  |  Quote  |  Print  |  Notify Moderator

Thing to do is turn all other electric off and then check what your voltage is at any plug. Then run the AC and then check the voltage at any plug. Even at 50', I bet you drop below 108v... While the AC is running, that low of voltage isn't doing your motor any favors, so...

For running anything else in the rig, you should be fine. It's the AC that will always tax the system to it's max, so gotta decide what you need to run and go from there.

I installed a dedicated 30a RV plug because when I ran my AC, it dropped my voltage to around 108v with only a 25' cheapie extension cord. Sure, I could have gotten a better cord, but decided to just go with the 30a setup..

Good luck!

Mitch


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