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Open Roads Forum  >  Tech Issues

 > 50 amp coach on 30 amp power

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theoldwizard1

SE MI

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Posted: 10/09/19 09:16am Link  |  Quote  |  Print  |  Notify Moderator

Some of what happens may depend on how your 50A to 30A adapter/cord is wired. There are two choices.

  • It may be wired so that one "leg" is completely ignored. If wired this way one of your AC and possibly some of your outlets will not work
  • If both legs are wired together, the worst case is that you will trip the breaker at the pedestal. You might even be able to run both AC units simultaneously (as long as they don't start simultaneously) or run both of your heaters


wolfe10

Texas

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Posted: 10/09/19 09:21am Link  |  Quote  |  Print  |  Notify Moderator

theoldwizard1 wrote:

Some of what happens may depend on how your 50A to 30A adapter/cord is wired. There are two choices.

  • It may be wired so that one "leg" is completely ignored. If wired this way one of your AC and possibly some of your outlets will not work
  • If both legs are wired together, the worst case is that you will trip the breaker at the pedestal. You might even be able to run both AC units simultaneously (as long as they don't start simultaneously) or run both of your heaters


I have never seen a 30 male to 50 female where the one hot on the 30 was only wired to ONE hot on the 50 amp side.

Said another way, a "proper" 30 to 50 always connects the single hot on the 30 amp male end to both hots on the 50 amp female end.

Would love to see a link to one wired any other way!


Brett Wolfe
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Johno02

Lexington, TN USA

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Posted: 10/09/19 10:18am Link  |  Quote  |  Print  |  Notify Moderator

Just think back to when you had a 30A rig, and do the same as you did then.


Noel and Betty Johnson (and Harry)
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Grey Mountain

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Posted: 10/09/19 10:27am Link  |  Quote  |  Print  |  Notify Moderator

It is not cold enough to use either the propane-driven furnace of the electric heat pumps. I use the small electric heater to break the morning chill, then turn it off. We are in Bellevue, Nebraska, and the temps are expected to drop to freezing tomorrow night. I will run propane heat then.
Only draw we have is the coffee pot and my wife's tea kettle.
OUrs is a 2006 Fleetwood Discovery, as my signature line states.

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DutchmenSport

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Posted: 10/09/19 10:51am Link  |  Quote  |  Print  |  Notify Moderator

If you exceed 30 amps, the breaker at the campground pedestal trips. That's all. Figure out what you can turn off inside your camper to be under the 30 amps, and flip the breaker back on. That's the worst that will happen.

It's called, "power management" ... being aware of how much electricity each item in the camper draws. Never run the air-conditioner and microwave at the same time. Together alone, they are fine. But combined, more than likely the breaker will pop.

Use your water heater on gas. If you use stand alone electric appliances, like space heaters, toasters, hair dryers, it's best to run a separate extension cord from the campground post inside the camper, plugged into the 20 amp plug (household plug), so those high energy items won't pull from the 30 amps available for your camper.

Just this last week-end we popped a breaker inside the camper, and we are 50 amp. We had 1 crock pot, 1 electric griddle, a coffee pot, and a toaster all on one circuit. All that happened was one of the 15 amp breakers inside the camper popped. We didn't realize all those plugs were on the same circuit. Now we know, and will never plug in that much at one time again.

Simple... easy-peasy, no damage, just learn from it.

2oldman

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Posted: 10/09/19 11:16am Link  |  Quote  |  Print  |  Notify Moderator

Grey Mountain wrote:

We are in Bellevue, Nebraska, and the temps are expected to drop to freezing tomorrow night. I will run propane heat then.
Excellent. That's the way to do it!

Lwiddis

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Posted: 10/09/19 11:37am Link  |  Quote  |  Print  |  Notify Moderator

You should be able to "live" quite nicely on 30 amps.


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wa8yxm

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Posted: 10/09/19 12:22pm Link  |  Quote  |  Print  |  Notify Moderator

Grey Mountain wrote:

What happens if we exceed the 30 amps available? Say, two small heaters that will use 15 amps each all by themselves.
GM

The two heaters use 25 amps total. the fridg about 3-4.. The converter may be enough to do you in and for sure the water heater will

What happens.. Well if you are outside on the service side you might hear a CLICK.

If you are inside. and of course it's 3 am. and raining...

You get dressed and go out and reset the park pedestal breaker.

Seriously that is the worst (Short term) that will happen.

NOTE I have both 30 and 50 amp cords for my Rig (The 30 amp cord has a 50 amp outlet with a jumper wire).. I keep a spare 30 amp plug cause those can burn up.. in your case keep a spare dogbone adapter.

And "Burn up" is a bit dramatic (they melt. no fire).

I also have the ability to "Split" power to two park outlets

Oh.. I mentioned the water heater.. Mine is 375 Watts. not 1500 but 375.

Suggestion.. On those two space heaters.. Put one on LOW.

Better suggestion: PUt both of 'em on LOW..

The worst that can happen using a 1500 Watt space heater on an RV outlet is a fire.. the outlets are not all that good when the amps hit double digits.. I've had one fail.. Seen two more that failed Due to the design of the outlet.. (I have special 15/20 amp rated outlets 12 ga wire bent around a screw.. one to a circuit breaker)


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Sam Spade

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Posted: 10/09/19 01:03pm Link  |  Quote  |  Print  |  Notify Moderator

Grey Mountain wrote:

It is not cold enough to use either the propane-driven furnace of the electric heat pumps.


There is a device that allows both those pieces of heating equipment to be used no matter what the temperature.

It is called a THERMOSTAT. [emoticon]

AND if it really is not THAT cold, ONE of the heaters would probably be plenty.


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rhagfo

Portland, OR

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Posted: 10/09/19 08:22pm Link  |  Quote  |  Print  |  Notify Moderator

When I read these post, and the use of electric space heaters all kinds of bad thoughts pass through my head. Dad was a Firefighter and strongly disliked electric space heaters, saw too many fires started by their use.
I prefer my Cheap Heat System, it will automatically switch from 220v 50 amp down to 120v 30 amp system. On 50 amp I get 5,000 watts of heat on 30 amp I get 1,800 watts over correctly sized cables. on the 30 amp 1,800 watt setting it will maintain 65 degrees in our 32' 5er down to the low 30's outside temp. If I need to raise the temp, I simply switch to gas and raise the temp, then go back to electric. I will say I have very seldom needed to use gas.


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