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Old 04-17-2019, 04:57 PM   #1
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Newbie intro and 50 amp 2nd AC question

DW and I have been RVing since 2015 and have thourghly enjoyed our current coach but we'd like to expand our travels and feel that to accomplish this we will need to down size. We visited one dealer and got a feel for the size and floorpans that will mimic our current one only more efficiently. We are considering the FC27FBQ.

The question is the 3 dealers I've checked seem to only have that model with dual AC's and the upgraded 50 amp service. Are 2 AC's necessary for this size unit? or are these just optioned out models that are slow to sell? I was thinking that 30 amp service is all I would need for that size unit and actually had a 3xxx watt 30 amp RV generator picked out for the times we boondock. I would much rather have the roof full of solar panels, more batteries and a 2000 watt inverter. (what I have now)

So your advice would be appreciated. Its not a deal killer, still get the genset and a 50amp to 30amp dogbone.

Thanks
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Old 04-17-2019, 05:08 PM   #2
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On a 27’ unit 2 AC would be preferred. A single AC unit will not keep your unit cool in the south with temps above 90*. Get a Micro-Air Easy start and install that on you units and you will be able to run either unit ( not both at same time) on a a Honda EU2200 generator.
My opinion is anything over 23’ Needs 2 AC units.
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Old 04-17-2019, 05:22 PM   #3
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I just took delivery of a FC27FBQ, and specifically wanted 50 amp/2 a/c. So far, the only downside is the weight of the 50 amp cord as compared to 30 amps, but this is far outweighed by having a second a/c and being able to run all appliances. I think 50 amps in a FC27FB is preferred...perhaps not necessary in some locations, but south/southwest camping will be a must. IMO.
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Old 04-17-2019, 05:30 PM   #4
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You want 2 AC’s. We have a 28’ and one wouldn’t do in really hot weather.
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Old 04-17-2019, 05:33 PM   #5
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It depends - on where, how, and when you camp.

If you are going to the extreme south or southwest mid summer and park in the sun, then two ACs probably will be needed.

My experience:
First, I do not plan camping trips when it is really hot (95 and up). Though, I have camped when it was 110F, and I was comfortable in my 34' trailer with one 15k BTU AC parked in the shade of a large tree. In extreme heat being selective about parking in the shade and starting the AC early in the morning makes the trailer more comfortable.

I've had one 34', one 31', three 30' and one 25' trailer. All of them have only had one AC unit. All of them have been comfortable the way I use a trailer.

I'm chasing 70, NOT 90+!
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Old 04-17-2019, 06:09 PM   #6
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If two AC units donít break your budget, then I would definitely get two units. We have seen the necessity of two AC units in our 27FBQ Globetrotter. Right now, we are still traveling in Florida as we are not snowbirds, just full-time travelers, and it is hot! Weíre at Koreshan State Park with 50amp service, and we are GLAD that we have it. In 91 degree heat today, we are cool and comfortable. One unit would cool ďokayĒ. We boondocked with Harvest Hosts in Tavares, FL using the 13.5K unit on our solar battery bank and generator, but it is not as efficient as 50amp service.

It is really all about what type of camping youíll do. Itís not one-size-fits-all. You may only need one unit like others have said already. Just remember, with one AC unit, you will have two fantastic fans with one located in the bedroom. With two AC units, youíll only have one fantastic fan in the living area in the Airstream. Sometimes, when boondocking, we wish we had the two fantastic fans. Itís all about comfort, and what suits your Airstream lifestyle the best.
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Old 04-17-2019, 06:19 PM   #7
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Advantage for the 2 AC units is that if it isn't really hot if you are sitting in the lounge area, well you can run the bedroom AC unit and keep things cool. And if you are sleeping you can run the AC unit in the living lounge area. It makes living a bit quieter and at night you don't have cold air blowing on you.
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Old 04-17-2019, 06:31 PM   #8
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Quote:
Originally Posted by cptdzl View Post
Are 2 AC's necessary for this size unit? or are these just optioned out models that are slow to sell? I was thinking that 30 amp service is all I would need for that size unit and actually had a 3xxx watt 30 amp RV generator picked out for the times we boondock.

When you're off the grid, you can always choose to use only 1 AC unit and still use your generator. When you're connected to 50A service, you can have the benefit of proper AC in the hot spots.
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Old 04-17-2019, 06:39 PM   #9
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appreciate the quick reply -more questions

Quote:
Originally Posted by Daquenzer View Post
Advantage for the 2 AC units is that if it isn't really hot if you are sitting in the lounge area, well you can run the bedroom AC unit and keep things cool. And if you are sleeping you can run the AC unit in the living lounge area. It makes living a bit quieter and at night you don't have cold air blowing on you.
So with 2 running is it twice as loud? I also choose to chase 70ļ weather I deduce that 2 units is more popular and would have more value on trade-in/sale when moving up?

MY current 50 amp coach has an energy management (load shedding)system for when its running on 30 amps, how does AS handle this? Is it up to Me the operator not to overload the circuit?

Thanks for your input
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Old 04-17-2019, 06:51 PM   #10
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Originally Posted by cptdzl View Post
<snip> Is it up to Me the operator not to overload the circuit?

Thanks for your input
The typical 30 to 50 adapter connects the single 30 amp load wire to both load wires of the 50 amp. So yes, you have to manage the load.

ps:
With the a 30 amp service you will have to manage load in every case.
Air conditioner (or electric strip/ heat pump in winter), microwave, water heater on electric, fridge on electric, and converter, all running at the same time, will exceed 30 amp draw.
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Old 04-17-2019, 06:51 PM   #11
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Quote:
Originally Posted by cptdzl View Post
So with 2 running is it twice as loud? I also choose to chase 70ļ weather I deduce that 2 units is more popular and would have more value on trade-in/sale when moving up?

MY current 50 amp coach has an energy management (load shedding)system for when its running on 30 amps, how does AS handle this? Is it up to Me the operator not to overload the circuit?

Thanks for your input
No they aren’t twice as loud. It’s just they aren’t necessarily quiet either. Plus the advantage of the Heat Pump in the units is you don’t have to use LP when it gets cool. They put out plenty of warm air. As to the circuit the 50 AMP is needed to run 2 AC units for start up if you don’t put in an easy start system. I don’t, but many on this forum do. It’s basically a capacitor that stores the charge necessary to start the unit. Once started 30 AMP runs them just fine. Otherwise if you just have one AC unit a 30 AMP will be sufficient. Many owners (myself included) have a 30 AMP adapter for when a campsite only has 30 AMP service.

I just think if you are going to get a 27’ AS that extra AC/Heat Pump comes in very handy. I know we have found it to be the case. And we live in WI not Florida. If you don’t have a shaded site, and it gets to 80 degrees out, then the AS can get pretty hot with all that aluminum soaking up the sun.
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Old 04-17-2019, 06:55 PM   #12
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I had a 2012 28’ International. I ordered it with one A/C.

After one year I went to JC and had the rear unit installed. I made a mistake in ordering only one.
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Old 04-18-2019, 08:12 AM   #13
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I sure wish our FC 27FBQ came with two air conditioners.
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Old 04-18-2019, 09:46 AM   #14
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Our 25' FC came with 50A (2 AC's). We looked at a single unit AS but felt that should the time come that we wanted to trade up, a dual-AC unit would sell much better in our 'Texas Summer' market.

When we sold our Jayco, we kept the 30A extension cord which we use in some of those 30A only campgrounds, with a 30-to-50 adapter. Haven't tried using both AC's on a 30A pedestal but just a single AC makes the plug run a little warm.

OT--has anyone converted to a SmartPlug? I like the idea but in the event of theft of your shore power cord, you're sorta 2X SOL, for the cord as well as the female termination at the end of it. Thanks!
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Old 04-18-2019, 10:54 AM   #15
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We also have the 2 ac's on our 25' 2017 FC - would not give them up for anything. 2 reasons- 1) We are prone to travel in the south. 2) with the 2 ac's you can sit in living area in the evening with the bedroom unit running and because of the ducting receive the air flow BUT less noisy and at night when sleeping you can have the living area unit running and receive the air in the bedroom and less noise. During the day when it's warm run both. On a larger model to me it's a no-brainer.
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Old 04-18-2019, 12:09 PM   #16
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Iíve converted to a SmartPlug system. Believe me, at the prices they charge, Iím darn careful to bring it with me.
It would not be useful to anyone without a SmartPlug system.
My extension cord is standard, but I rarely use it.
If I get real paranoid I have a lock and chain along that will deter casual theft.
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Old 04-18-2019, 01:19 PM   #17
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One air conditioner on my 25 foot would not cool it enough in Las Vegas. My 30 foot has two and keeps up with the hot weather nicely. The 50 amp cord is heavy. It's also a little stiff in winter. I solved that problem by buying a 30 amp cord that has a 50 amp head where it connects to the Airstream. I bought it on Amazon. It is a Marinco Park Power.
Bottom line: You need two air conditioners. You won't be sorry.
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Old 04-18-2019, 01:19 PM   #18
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Get the 50 amp/dual A/C. You will regret it if you donít.
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Old 04-18-2019, 01:51 PM   #19
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Get 50amp & 2 A/C. Better to have to much than not enough.
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Old 04-18-2019, 05:09 PM   #20
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Well you sold me on 2 A/C's but.....

a 3k-4k inverter genset should handle one A/C unit with judicial microwave use? only other 120v item is the battery charger right ? all other stuff is 12v or propane correct?



https://www.championpowerequipment.c...fuel-inverter/


Thanks
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