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Old 08-16-2012, 09:25 AM   #1
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30 to 50 amp idea

Hi all. So with my 30 amp setup, I've read several methods of tapping in back by the gen for a second plug for the extra a/c unit, easy enough but why couldnt a person mount a small sub panel with a 30 amp breaker for the coach and a 20 amp breaker for the second a/c and then maybe an ATS to avoid having to plug the a/c in and out of the generator? This way I could have a 50 amp cord on the coach.
I understand that 50 amp service is 220 and the sub panel idea works great because it has two seperate poles, one for my single pole 30 and the other for the single pole 20.
Now, what about parks that only have 30 amp plug ins? What does the 50 amp crowd use in that situation? Is there an adapter that splits the voltage between both legs of the plug, or does it eliminate one leg?
Thanks for the insight, I wanted to get some pros and cons from some people before tackling this idea. Thanks!
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Old 08-16-2012, 09:58 AM   #2
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Our 50A Bounder is not 220v. It is 2x110v legs. At 30A sites we use an adapter that sends 110v down both legs. The Energy Management System then decides how to shed the load. Generally, one a/c compressor is kept off.
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Old 08-16-2012, 10:55 AM   #3
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Many 30A coaches come wired just as you describe - a 30A line for the main RV feed and a second 20A line for the rear a/c alone.

50A coaches use adapter for 30A power that simply connects the 30A source to both hot "legs" of the 50A service. The coach can draw any combination of amps on the two hot legs as long as the total doesn't exceed 30A. That works fine for most motorhomes, since they seldom have any actual 240v appliances. The few that do, e.g. have a electric stove/oven, cannot use that type of adapter and must run their generator if they do not have standard 50A shore power available.
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Old 08-16-2012, 11:36 AM   #4
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Our 50A Bounder is not 220v. It is 2x110v legs. At 30A sites we use an adapter that sends 110v down both legs. The Energy Management System then decides how to shed the load. Generally, one a/c compressor is kept off.
I understand that your coach is not 220 but your 50 amp feed is. 2x110v legs equals 220, although you dont have anything in your coach that runs on 220, it is running into your coach.
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Old 08-16-2012, 11:37 AM   #5
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i have a friend that is an electrician hes say to run 2 wires 10 -2 twist together at the end an you have 50 amps really 60 but we only need 50 that is what we are doin
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Old 08-16-2012, 01:05 PM   #6
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What?
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Old 08-16-2012, 01:28 PM   #7
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What?





I know it was not meant to be funny, but it is hilarious! Sorry....
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Old 08-16-2012, 01:31 PM   #8
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I understand that your coach is not 220 but your 50 amp feed is. 2x110v legs equals 220, although you dont have anything in your coach that runs on 220, it is running into your coach.
While the two 110 v legs COULD be wired to become 220, they are not wired that way anywhere from the power post to the RV, so it is NOT 220 v, it only has the capacity to be wired at 220 if you wanted it.
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Old 08-16-2012, 01:41 PM   #9
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There always seems to be some confusion regarding 50amp RV service.

It is indeed 240v 50amp from the campground pedestal all the way to the RV's circuit breaker panel.

The vast majority of RVs only use the 120v legs of the 240v service, but there is 240v in your RVs breaker panel.

Click here for a detailed explanation. Then click on 50-amp service.
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Old 08-16-2012, 02:00 PM   #10
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There always seems to be some confusion regarding 50amp RV service.

It is indeed 240v 50amp from the campground pedestal all the way to the RV's circuit breaker panel.

The vast majority of RVs only use the 120v legs of the 240v service, but there is 240v in your RVs breaker panel.

Click here for a detailed explanation. Then click on 50-amp service.
I checked your link and see nothing that there is 240v in pedestal. It is two 120v legs. Unless combined, they are only 120v, not 240v. My EMS display shows two legs, each one 120v. Yes, the potential to get 240v is there, but unless the two hot legs are combined, it remains 120v. I could hook up two extension cords from both outlets of a 120v 15 amp wall outlet and combine them to get 240v, at 7.5 amps, but it's not normally thought of as 240v. I know, phases might be out, but none the less...
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Old 08-16-2012, 02:08 PM   #11
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If you click on the 50-amp Service link, it is explained.

Also click on Outlet Testing for further explanation.
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Old 08-16-2012, 02:23 PM   #12
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I checked your link and see nothing that there is 240v in pedestal. It is two 120v legs. Unless combined, they are only 120v, not 240v. My EMS display shows two legs, each one 120v. Yes, the potential to get 240v is there, but unless the two hot legs are combined, it remains 120v. I could hook up two extension cords from both outlets of a 120v 15 amp wall outlet and combine them to get 240v, at 7.5 amps, but it's not normally thought of as 240v. I know, phases might be out, but none the less...
Call it what you like, but for those who know it's absolutely 120/240v 1phase power from the 50amp outlet that equals 12,000 watts of power to the coach panel. It's 110/120v from the 30amp outlet that equals 3600watts of power to the coach panel.

If you had 2 cords out of outlets that were on the separate circuits with 15 amp breakers, you would have 240volts @ 15 amps, not 7.5 amps.

Regards, Howard
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Old 08-16-2012, 03:43 PM   #13
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When I wire a 50 amp plug it has 2-120volt hot legs, 1 ground and a neutral wire 4 wires, simply said it is a 50 amp single phase plug., not 220 volts.


Happy RVing, James
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Old 08-16-2012, 03:55 PM   #14
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My brother in law thought the same so he wired his 50 amp travel trailer to 240 like a clothes dryer. Unfortunately he had two AC on and the stereo when the smoke cleared he had to replace the two AC's, stereo and tv. Expensive lesson.
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