RV News RVBusiness 2021 Top 10 RVs of the Year, plus 56 additional debuts and must-see units → ×
 


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 04-29-2012, 07:51 PM   #1
1 Rivet Member
 
1995 31' Land Yacht LE
Jacksonville , Florida
Join Date: Apr 2012
Posts: 6
30 amp to 50 amp conversion

I just realized today that my single 13,500 BTU AC is not quite adequate for the Florida heat. I have a 1995 31' Land Yacht LE. I am considering adding an additional roof AC in the bedroom or at least upgrading to a 15,000 BTU AC. But I really don`t think a single unit is going to cut it. I realize I will have to upgrade to 50 AMP. Has anyone done this? And is the Land Yacht LE prewired for an additional AC? Any info would be greatly appreciated.
FLMedic is offline   Reply With Quote
Old 04-29-2012, 09:49 PM   #2
Rivet Master
 
richinny's Avatar
 
2011 34' Classic
Westchester Cty.NY , / Miami FL
Join Date: Jul 2007
Posts: 3,122
you'll find some information here:
http://www.airforums.com/forums/f427...ml#post1140320
__________________
Ricky
2012 F150 Super Crew 5-1/2' bed Ecoboost 4x4 3.73 elec. lock diff. Propride hitch
give life. kidney & pancreas transplant 9/9/06
Ingrid-my unofficial '"World's Oldest Streamer" 1909-2008 R.I.P.
richinny is offline   Reply With Quote
Old 05-02-2012, 05:01 PM   #3
1 Rivet Member
 
1995 31' Land Yacht LE
Jacksonville , Florida
Join Date: Apr 2012
Posts: 6
Well, I have yet to find a service center who will attempt the conversion. Or maybe they just don't know how. I've tried Camping Wxxxd and a couple others here in Jacksonville. No luck yet. I hope someone can help steer me in the right direction.
FLMedic is offline   Reply With Quote
Old 05-02-2012, 05:10 PM   #4
Rivet Master
 
Currently Looking...
Gainesville , Florida
Join Date: Jul 2005
Posts: 7,059
Blog Entries: 2
Try jd sanders airstream in alachua, near Gainesville. Call and ask for mark, he will tell you if they can do it or not. Jim
xrvr is offline   Reply With Quote
Old 05-02-2012, 05:16 PM   #5
Rivet Master
 
DaveFL's Avatar
 
2000 31' Land Yacht
Central , Florida
Join Date: Aug 2007
Posts: 1,489
Images: 15
Is the land yacht le a MH or trailer?
DaveFL is offline   Reply With Quote
Old 05-02-2012, 05:22 PM   #6
Rivet Master
 
Mike Leary's Avatar
 
Currently Looking...
1984 31' Airstream310
Ajo , Arizona
Join Date: Mar 2007
Posts: 7,649
Images: 4
Quote:
Originally Posted by DaveFL View Post
Is the land yacht le a MH or trailer?
Matters not, AS was was not thinking that parks would go 50 amp and, therefore, be able to run both roof airs. We have the same problem, dual roof, 30 amps, without tearing out the whole rear inside, it's impossible to get to all the connections to run the rear air and still be able to run both roofs from the gen set.
Mike Leary is offline   Reply With Quote
Old 05-02-2012, 05:34 PM   #7
Rivet Master
 
Currently Looking...
Gainesville , Florida
Join Date: Jul 2005
Posts: 7,059
Blog Entries: 2
Seems there was a thread years ago on how both acs could operate at once. Jim
xrvr is offline   Reply With Quote
Old 05-02-2012, 05:37 PM   #8
Rivet Master
 
Currently Looking...
Gainesville , Florida
Join Date: Jul 2005
Posts: 7,059
Blog Entries: 2
Search running two air conditioners at once, jim
xrvr is offline   Reply With Quote
Old 05-02-2012, 06:13 PM   #9
Rivet Master
 
TG Twinkie's Avatar
 
1974 Argosy 26
Morrill , Nebraska
Join Date: Nov 2009
Posts: 6,004
Images: 2
Blog Entries: 5
Are both A/C's fed from the same circuit breaker? If they have separate breakers that means they are wired separately.
If one were to wire the panel for 220/240 volts, one hot leg could provide power to A/C #1, the other hot leg could provide power to A/C #2.
Most panels I've seen in RV's have a "split buss" system. this is the reason there is a jumper between the 2 big lugs in the panel on the hot side.
If you remove the jumper and wire the shore power cord for 220 volts then connect each of the two hot legs to their respective hot lugs (L1 and L2) and the neutral and the ground to their respective terminating points. All devices would still be powered by 110volts.
It would however require a panel with enough capacity to install a two pole main breaker instead of a single as we are use to seeing.
If the panel had the capacity (space) to install all of the breakers in that exist today one the L1 buss except for the second A/C. All systems would function as they do today.
The second A/C would run off of the L2 buss.
This would require a 4 wire shore power cord L1,L2, Neutral and ground.
With an adaptor wired correctly for a 30 amp 110 on one end and a 4 wire receptacle on the other, you could plug in to the standard 30 amp receptacle where there are no 50 amp/220 receptacles available. All systems would work normally except the second A/C would not have power.
This setup assumes that the 50 amp service at campgrounds is a 220 volt 4 wire system.
If not, then I've typed this for nothing. LOL
TG Twinkie is offline   Reply With Quote
Old 05-02-2012, 07:08 PM   #10
Rivet Master
 
JimGolden's Avatar
 
Vintage Kin Owner
1977 31' Excella 500
Berkeley Springs , West Virginia
Join Date: Sep 2005
Posts: 1,630
Images: 7
What Color Is Your Roof?

Have you painted your roof white?

I have a 34 footer and a Carrier 15,000BTU a/c and it keeps it nice and cool inside. BUT, before I even upgraded to the new Carrier, I painted the roof white on my coach and, no exaggeration, it dropped the temps 10 degrees!

You need to use the right process for aluminum if you want to do it. I got a metal etcher from Aircraft Spruce and Specialty. You must etch the aluminum first (it's simple, just mask off the big area you want to paint white, then wipe this etching stuff on with a roller....wait so long like a half hour or so, then you rinse it all off with a hose), then you must use a special primer that is made for etched aluminum. I got mine from a buddy who works for US Air and they paint their airplanes with it. But you can also get it from Aircraft Spruce (or Wick's as well). It's typically made of Zinc Chromate or an epoxy substance. But anyway, you first etch it, then you use the correct primer that is made for aluminum. After that, you can use any good paint. I used Rustoleum Gloss White; got a gallon jug at Lowes and put it on with a foam roller. It looks great, and really helps cut the thermal gain.

OK, after you do that, you can still run a 15,000 BTU a/c unit on 30 amp. You just can't run the microwave and a hair dryer at the same time.


As for wiring up a 50 amp, I did get a new 55 amp converter that I plan to install as well. The branch circuitry really doesn't change much; you just have to remove the old converter and replace with the new, and you should have more spaces in it for additional circuit breakers. You'll have to get a new main chord to run from the converter to the 50 amp outlet, but it's not a big deal. Any decent electrician could do this for you.

Best of luck,
__________________
- Jim
JimGolden is offline   Reply With Quote
Old 05-02-2012, 08:41 PM   #11
Rivet Master
 
vswingfield's Avatar
 
1983 34' Excella
1967 24' Tradewind
Little Rock , Arkansas
Join Date: Nov 2006
Posts: 3,821
Images: 32
Quote:
Originally Posted by JimGolden View Post
...

As for wiring up a 50 amp, I did get a new 55 amp converter that I plan to install as well. The branch circuitry really doesn't change much; you just have to remove the old converter and replace with the new, and you should have more spaces in it for additional circuit breakers. You'll have to get a new main chord to run from the converter to the 50 amp outlet, but it's not a big deal. Any decent electrician could do this for you.

Best of luck,
Changing to a 55 amp converter is completely different than changing the AC service to the entire trailer. The converter's amperage is how many 12 volt DC amps it is capable of putting out to the DC system, including charging the batteries. Changing form 30 amp AC to 50 amp AC is an upgrade to the entire AC supply to the trailer, not the charging power of the converter.

Also, the main AC power cord does not go directly to the converter, but instead, to the main breaker box.

These are completely different systems. The converter merely plugs into one of the outlets wired to one of the breakers.

__________________

Back to the topic of increasing AC capacity to facilitate the addition of a second Air Conditioner. I asked about it in the past, and Andy suggested the addition of a second 30 amp system and cord to power the second unit vs a conversion to a single cord 50 amp system. He said that you could use a 50 to 30 amp adapter to plug one 30 amp cord into the 50 amp outlet and plug the other 30 amp cord into the 30 amp outlet. He claimed that it was easier and less expensive.

I haven't added a second Air Conditioner, but when/if I do, I will consider this option vs converting to a single 50 amp cord.
__________________
Vaughan
vswingfield is offline   Reply With Quote
Old 05-03-2012, 06:21 AM   #12
Rivet Master
 
DaveFL's Avatar
 
2000 31' Land Yacht
Central , Florida
Join Date: Aug 2007
Posts: 1,489
Images: 15
Talking

Quote:
Originally Posted by Mike Leary View Post
Matters not, AS was was not thinking that parks would go 50 amp and, therefore, be able to run both roof airs. We have the same problem, dual roof, 30 amps, without tearing out the whole rear inside, it's impossible to get to all the connections to run the rear air and still be able to run both roofs from the gen set.
Does to anybody giving opinion on system, MH are wired so that the a/c's can be run at the same time from the generator, new wiring can be installed using the exisiting wires. In the genset compartment is a junction box, in it are the two circuits, 30 amp and 20 amp, in the cabinet over the sink is a switch marked Front or Rear A/C when set on front using the genset both work.
DaveFL is offline   Reply With Quote
Old 05-03-2012, 09:11 AM   #13
4 Rivet Member
 
raveson's Avatar
 
1989 34.5' Airstream 345
boca raton , Florida
Join Date: Aug 2006
Posts: 287
I had the same problem on my 345. The difference is there are two air units on the roof and would only both work if gen was on. The gen has two circuts, 30 and 20 amp. I installed from Power Solutions for about $100 a system that allows you to divert the 20 amp circut through an additional cord to the power pole when on shore power, allowing both units to operate. An inexpensive and easy solution. If you have two existing units on the roof, the solution is simple, if an additional unit is added, then more wireing will probably be needed, but hopefully you will not have to go to 50amp service.
raveson is offline   Reply With Quote
Old 05-03-2012, 09:20 AM   #14
2 Rivet Member
 
lylesgl's Avatar
 
2007 27' Safari FB SE
Springfield , Virginia
Join Date: Aug 2010
Posts: 82
In addition to the 15K a/c I'm adding a 13.5K to the bedroom area of my 27FB. JC can do the mod by adding a receptical outside the airstream that will power the a/c unit independently. This does away with the need to upgrade to 50amp system.
lylesgl is offline   Reply With Quote
Old 05-03-2012, 12:36 PM   #15
Rivet Master
 
DaveFL's Avatar
 
2000 31' Land Yacht
Central , Florida
Join Date: Aug 2007
Posts: 1,489
Images: 15
Receptical outside should be a male service connection so that when you plug in at the pole, cord at the trailer would be a female connector and safe to handle when hot.
DaveFL is offline   Reply With Quote
Old 05-03-2012, 06:48 PM   #16
Rivet Master
 
JimGolden's Avatar
 
Vintage Kin Owner
1977 31' Excella 500
Berkeley Springs , West Virginia
Join Date: Sep 2005
Posts: 1,630
Images: 7
You got me :)

VS,

My initial reaction to your posting was "What??!!" But, I see that I have used the wrong terminology. I stand corrected.

What I have purchased is a Progressive Dynamics Power Control Center. I used the term "converter" in the generic and I see that that is incorrect.

At any rate, take my earlier post and substitute "Power Control Center" for where I said "Converter" and you should be AOK. Yep, the converter is simply that portion of the power control center that "converts" 120v alternating current to 12v direct current. As opposed to an "inverter" (which works the other direction....like you'd find in an ambulance) that inverts 12v dc to 120v ac current.

OK, so all that being said, remember that Watts = power and that amperage times voltage = watts. So, if you are restricted to 120v ac, if you want more power, you need more amps because the voltage doesn't change. Hence the ramp up from 30amp to 50amp. Even though they call it a 50amp, the power control center (not a converter ) says 55amp on it.

Anyway, you will most likely need 50amp service to run two a/c units. But I still say that if you paint your roof white and get a good 15,000 btu unit, you could get by on 30amp. Just can't run the a/c, the microwave, and a hair dryer at the same time.

See you all on the road!
__________________
- Jim
JimGolden is offline   Reply With Quote
Old 05-03-2012, 09:42 PM   #17
Rivet Master
 
vswingfield's Avatar
 
1983 34' Excella
1967 24' Tradewind
Little Rock , Arkansas
Join Date: Nov 2006
Posts: 3,821
Images: 32
Quote:
Originally Posted by JimGolden View Post
VS,

My initial reaction to your posting was "What??!!" But, I see that I have used the wrong terminology. I stand corrected.

What I have purchased is a Progressive Dynamics Power Control Center. I used the term "converter" in the generic and I see that that is incorrect.
Fair enough. When I first read it, my initial reaction was also "What??!!" Followed by"I don't think that's really what Jim meant."

It's really different in my 83 Excella center bath. The breaker box is in the closet across the hall from the bath and the converter is under the front window over 20 feet away.

Quote:
Originally Posted by JimGolden View Post
At any rate, take my earlier post and substitute "Power Control Center" for where I said "Converter" and you should be AOK. Yep, the converter is simply that portion of the power control center that "converts" 120v alternating current to 12v direct current. As opposed to an "inverter" (which works the other direction....like you'd find in an ambulance) that inverts 12v dc to 120v ac current.

OK, so all that being said, remember that Watts = power and that amperage times voltage = watts. So, if you are restricted to 120v ac, if you want more power, you need more amps because the voltage doesn't change. Hence the ramp up from 30amp to 50amp. Even though they call it a 50amp, the power control center (not a converter ) says 55amp on it.

Anyway, you will most likely need 50amp service to run two a/c units. But I still say that if you paint your roof white and get a good 15,000 btu unit, you could get by on 30amp. Just can't run the a/c, the microwave, and a hair dryer at the same time.

See you all on the road!
I agree that painting the roof white is worthwhile. I did mine last summer with a couple of coats of Super Therm. The painted area is cool to the touch in full sun on 100į+ days.

I also have a 15,000 Btu Carrier I installed in 2008. I wouldn't call it comfortable on hot days, a second AC would be nice but just not in the cards right now. With shorts and a fan it is OK during the heat of the day. Perfectly fine at night.

I also keep it parked east-west with the bedroom, that doesn't have pano windows, on the west end. That helps too.
Attached Thumbnails
Click image for larger version

Name:	Super Therm on Roof DSC01786.jpg
Views:	83
Size:	140.7 KB
ID:	157399  
__________________
Vaughan
vswingfield is offline   Reply With Quote
Old 05-03-2012, 11:29 PM   #18
2 Rivet Member
 
ARLINGTON , Texas
Join Date: Sep 2008
Posts: 41
50 amp conversion

We have a 34' TT and live in Texas and also found the one 13500 A/C did not cool very well in triple digit weather. I had North Dallas RV in Carrollton, Tx install a second 13500 unit in the bedroom. We took the fantastic fan out and moved it the the bathroom for more airflow, then installed the new a/c in the same hole the fan came out of. We put in a different circuit breaker panel to add another breaker for the second a/c, and installed an electrical inlet just like the new trailers come with, along with a new 50 amp cord. Both a/c's now run at the same time as long as you are plugged into a 50 amp service. If a 30 amp service is all that is available then you can run only one a/c at any given time. The results are nothing short of spectacular, no issues staying cool whatsoever, in fact you will even get cold. I know it's a long way from Florida, but the folks at North Dallas RV are Airstream experts, and did a very good job. They can be reached at 972-242-0404. Hope this helps.
HighFlying is offline   Reply With Quote
Old 07-22-2012, 08:46 PM   #19
2 Rivet Member
 
ARLINGTON , Texas
Join Date: Sep 2008
Posts: 41
Hi just wanted to give an update in our 2nd A/C install. As I mention before we added the second A/C along with upgrading to 50 amp service. Just have to plug in one cord, like the new trailer on the back roadside of trailer and this allows us to run anything in the trailer. We just got back from a week long trip to New Braunfels, Tx where the temperature was running about 95 during the day, and with both A/C's running the front living area stayed 74 degrees with the thermostat set at the same temperature. With the bedroom set about half way down, it would keep the bedroom/bathroom area at 69 degrees. Needless to say we were very comfortable during the day and while sleeping. We could not be happier and would recommend this addition to anyone, who cannot cool their trailers.
HighFlying is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.



All times are GMT -6. The time now is 11:49 AM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2021, Jelsoft Enterprises Ltd.