2nd AC in bedroom or garage if using for sleeping?

[gtsum]

Getting ready to order a toy hauler (either Keystone Impact 341, XLR Thunderbolt 340x12hp, or Jayco Seismic Wave 352w). Pretty similar in size and options, but I dont know to order the second ac in the garage or the bedroom? The main unit will be 15k btu...our boys (7 and 4) will be using the garage as their bunk house when sleeping and it can get hot here in Virginia/North Carolina, South Carolina, etc) in the summer, but nothing like Florida/Arizona, etc. All the above have 1-2 AC ducts in the garage from the main unit, but I have no idea if that will be enough (I am thinking not?)

Also, when ordering the 2nd AC from the factory, am I correct in that it is tied into the rest of the ducting system, or is it old school and just cools the room that it is installed in? If tied into the rest of the ducting system, then it really shouldnt matter if it was in the bedroom or garage, right? Or I am completely off base here?

[gtsum]

After looking at more units yesterday, we are going to order an XLR Thunderbolt 340x12hp. The floor plan has everything we are looking for and seems to be put together fairly well. I spoke with the factory rep about 2vs3 AC's and he said they do a few of them on the bigger AMP lineup (40ft plus) and it has an Energy Management system that allows you to run all 3 at the same time. If you then run water heater, or coffee pot, etc,it will reduce the amps (or whatever) to the garage one and would eventually shut if off if the draw got to be too much and start it up again when available. Said can run all three with the 5500 generator and when on 50amp power can run all three without issue or interference from the energy management system????

Seems like a good idea? Said he can only recall a few of the 340x12hp units being sold with the 3 ac's. Said arizona, florida, etc in the dead of summer you will need all 3....the bedroom ac is tied into the ductwork of the main ac, (ie not just blowing in the bedroom), so 2 would like be enough for our purposes (bedroom and living room)

[gtsum]

offtohavasu wrote:

gtsum wrote:
There is an option to have three AC's on the XLR Thunderbolt and it is run by something called an "Energy Management System". Whatever that means?

An Energy Management System watched your load vs. your supplied power amps, whether it be shore power or generator. Some systems have a simple switch on the EMS panel where you select your input (20, 30, 50 amps). The EMS will shed load based on that and/or make sure things like 3 a/c units don't fire up at the same time causing too much of a load.

Makes sense. Thanks!

[offtohavasu]

1L243 wrote:

The Texan wrote:
1L243, you have not been looking very hard. 90% of all 42'+ coaches have 3 ac's and some of your tour groups have as many as 5 on their rolling homes. The "new" systems will allow all 3 to start and run simultaneously on a 50a ckt. There are multiple 40'+ fivers here in the park with 3 ac's on the roof, along with the motorhomes.

Actually I said TT and Fifth wheels I am very aware that 45 foot class A's have 3 AC's but they have a very sophisticated electrical system and cost alot of money... We live near a 5 Star RV resort with near 200 sites and I actually spent alot of time there and never have seen a TT or Fiver with 3 AC's. I guess 3 AC's are more popular in AZ than Oregon...

Momentum comes to mind using the EMS to balance 3 a/c on their fifth wheels. You have an option for 1/2/3 units for living, bedroom and garage.

[offtohavasu]

gtsum wrote:
There is an option to have three AC's on the XLR Thunderbolt and it is run by something called an "Energy Management System". Whatever that means?

An Energy Management System watched your load vs. your supplied power amps, whether it be shore power or generator. Some systems have a simple switch on the EMS panel where you select your input (20, 30, 50 amps). The EMS will shed load based on that and/or make sure things like 3 a/c units don't fire up at the same time causing too much of a load.

[gtsum]

There is an option to have three AC's on the XLR Thunderbolt and it is run by something called an "Energy Management System". Whatever that means?

[1L243]

The Texan wrote:
1L243, you have not been looking very hard. 90% of all 42'+ coaches have 3 ac's and some of your tour groups have as many as 5 on their rolling homes. The "new" systems will allow all 3 to start and run simultaneously on a 50a ckt. There are multiple 40'+ fivers here in the park with 3 ac's on the roof, along with the motorhomes.

Actually I said TT and Fifth wheels I am very aware that 45 foot class A's have 3 AC's but they have a very sophisticated electrical system and cost alot of money... We live near a 5 Star RV resort with near 200 sites and I actually spent alot of time there and never have seen a TT or Fiver with 3 AC's. I guess 3 AC's are more popular in AZ than Oregon...

[deltabravo]

1L243 wrote:
I am thinking that running two AC's on a 30amp or three on a 50amp system is going to require some kind of electrical management control. ie if your running all your AC's amd then flick on the Microwave or Coffee maker it's going to shut down one of the AC's till the load passes.

Xantrex makes a system that does exactly that, but your typical RV production line factory can't come close top comprehending how to install such a beast in an "assembly line" environment where everything is thrown together.

High end motor-coaches use them.

http://xantrex.com/power-products/default/freedom-sequence-ems-power-manager.aspx

Looks like it works in conjunction with their inverter - I don't know if t will run as a stand-alone load management system or not.

[The_Texan]

1L243, you have not been looking very hard. 90% of all 42'+ coaches have 3 ac's and some of your tour groups have as many as 5 on their rolling homes. The "new" systems will allow all 3 to start and run simultaneously on a 50a ckt. There are multiple 40'+ fivers here in the park with 3 ac's on the roof, along with the motorhomes.

[1L243]

I am thinking that running two AC's on a 30amp or three on a 50amp system is going to require some kind of electrical management control. ie if your running all your AC's amd then flick on the Microwave or Coffee maker it's going to shut down one of the AC's till the load passes. I look at RV's going down the road all the time and I don't think I have ever seen a TT or Fifth wheel with 3 AC's on it. Not saying it's not done but must be pretty rare...

[deltabravo]

Also, be sure the unit can be ordered with a 50 amp electrical service. Even with 2 A/Cs, I'd want 50 amp, so I could always run them at the same time and not worry about blowing a breaker if the microwave or water heater kicked on.

[gtsum]

3 it is!

[benb21601]

The new style 15000 btu A/Cs only pull 10 amps running and 13 on startup. The 5500 onan or 50 amp service will power all 3 and then some. As for the original question--that's impossible to answer. The bunk room merits another unit as it is a large volume of air to cool, the master makes its own case as that's where the one who pays the bills sleeps. I couldn't decide either so I ordered all 3 on my 2015 Seismic 3902.

[1L243]

My Rig came pre wired in the Garage for a second AC (50amp service) I added a 11k non ducted unit. The main unit is 15k ducted. For me If I had kids sleeping in the garage and I could only have TWO AC's I would put the second one in the garage...

It was my understanding that to have two AC's you needed 50 amp 240 volts which can be split into two 110's. One AC on one side and one on the other.

Just curious how you hook up 3 AC's that can be ran at the same time on a 50 amp service?

[gtsum]

tinner12002 wrote:
Like other posters have said if you can get all 3 get them...doesn't mean you have to use them, plus prob cheaper installed before rather than afterward.

5500 onan. I will see if I can order three ac's. Only like 750 extra for the 2nd one so a third, if available, should be similar. Thanks!