Good Sam Club Open Roads Forum: General RVing Issues: 50 Amp Usage Question
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 > 50 Amp Usage Question

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wa8yxm

Wherever I happen to park

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Posted: 04/22/21 05:05am Link  |  Print  |  Notify Moderator

I have used two 20 amp circuits to power my RV, I had to exercise limited energy management (leave water heater and fridge on GAS only. turn off an AC if I used elewctric Kitchen stuff) but that would be my choice.

However I will warn.. If you "Back feed" an outlet with a generator during power fail that is very very very very very dangerous.. Have a proper transfer switch installed so that the loads (Selected loads as well) are, at your choice, powered by Mains or Generator.

Leave one seldom needed light on the MAINS only. turn it on during power fail and when it glows.. Switch back to mains.

And yes. that is exactly how I did it.


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dodge guy

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Posted: 04/22/21 05:28am Link  |  Print  |  Notify Moderator

Well first off you can’t use a 220V circuit on a 50A RV!
Second higher amps is always the better way to go.
But since you’re wiring everything, why not just run a couple 50A RV services with a 30A RV outlet.


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JimBollman

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Posted: 04/22/21 07:11am Link  |  Print  |  Notify Moderator

Thanks to those that answered my question. Sounds like even though the total watts available on the 20amp 220v outlet is higher, the option to the RV to use up to 30 amps selectively would be better. I didn't know how the 30amp to 50amp adapter was wired that makes sense.

As far as why I don't just put in a 50 amp service, access to my place is questionable to all but the smallest of 50amp RVs so probably would never be used. Accept for the 30amp RV box I already had everything else I needed to put in the the 30amp service.

BB_TX

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Posted: 04/22/21 07:58am Link  |  Print  |  Notify Moderator

JimBollman wrote:

Thanks to those that answered my question. Sounds like even though the total watts available on the 20amp 220v outlet is higher, the option to the RV to use up to 30 amps selectively would be better. I didn't know how the 30amp to 50amp adapter was wired that makes sense.
........

I tend to agree with the 30 amp being the better option even though the dual 20 amp has the potential for more total power. And it would depend on the individual RV. An AC will run fine from a 20 amp circuit. But depending on how an individual RV is wired, there may be other commonly used higher amp devices on that same hot leg and cause a 20 amp breaker to trip where it would be fine on the 30 amp. Whereas the other 20 amp hot leg might be only lightly used due to the devices wired to it.

ScottG

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Posted: 04/22/21 09:13am Link  |  Print  |  Notify Moderator

dodge guy wrote:

Well first off you can’t use a 220V circuit on a 50A RV!
Second higher amps is always the better way to go.
But since you’re wiring everything, why not just run a couple 50A RV services with a 30A RV outlet.


Every 50A RV has 240VAC coming into it but it's then separated into two 120VAC circuits.

dodge guy

Bartlett IL

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Posted: 04/22/21 09:16am Link  |  Print  |  Notify Moderator

ScottG wrote:

dodge guy wrote:

Well first off you can’t use a 220V circuit on a 50A RV!
Second higher amps is always the better way to go.
But since you’re wiring everything, why not just run a couple 50A RV services with a 30A RV outlet.


Every 50A RV has 240VAC coming into it but it's then separated into two 120VAC circuits.


Look at the wiring of a 50A RV outlet. It is not 240V! Now you can wire in 240 after the panel in the RV. But coming in, no it’s 2 120V 50A circuits. Just adding up the voltage does not make it 240!

ScottG

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Posted: 04/22/21 09:25am Link  |  Print  |  Notify Moderator

dodge guy wrote:

ScottG wrote:

dodge guy wrote:

Well first off you can’t use a 220V circuit on a 50A RV!
Second higher amps is always the better way to go.
But since you’re wiring everything, why not just run a couple 50A RV services with a 30A RV outlet.


Every 50A RV has 240VAC coming into it but it's then separated into two 120VAC circuits.


Look at the wiring of a 50A RV outlet. It is not 240V! Now you can wire in 240 after the panel in the RV. But coming in, no it’s 2 120V 50A circuits. Just adding up the voltage does not make it 240!


I'm sorry but you just don't understand what this circuit is. It's simply a 240VAC range outlet. It does measure 240 across in your RV's panel and yes, adding up two 120VAC circuits that are on opposite sides of a split phase does give you 240V.
Maybe we're just getting stuck in semantics here..

CA Traveler

The Western States

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Posted: 04/22/21 09:30am Link  |  Print  |  Notify Moderator

dodge guy wrote:

Look at the wiring of a 50A RV outlet. It is not 240V! Now you can wire in 240 after the panel in the RV. But coming in, no it’s 2 120V 50A circuits. Just adding up the voltage does not make it 240!
Dodge guy that is incorrect.

It's a 120/240V 50A 4 wire circuit. The very same circuit used in virtually every house in the US except they are 100A or more.

Granted very few 50A RVs have 240V appliances but some do.


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Bob


CA Traveler

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Posted: 04/22/21 09:37am Link  |  Print  |  Notify Moderator

OP Your adapter will not work with a GFCI plug. The code requires that outside GFCI plugs be GFCI protected.

older_fossil

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Posted: 04/22/21 10:03am Link  |  Print  |  Notify Moderator

CA Traveler wrote:


Granted very few 50A RVs have 240V appliances but some do.


Our Allegro Bus is basically all electric (except the AquaHot on diesel). Our main induction cooktop needs 240V to work. When on a 30A service we break out a portable induction burner that runs on 120V. I've heard that sometimes rigs will have 240V clothes dryers. Our uses 120V, slower but gets the job done.

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