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RV Rooftop A/C: anyone done this?
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Windig89
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PostPosted: Tue Jul 10, 2012 5:17 pm    Post subject: Reply with quote

Love My Westy wrote:
My way of cooling down---go to the mountains!

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So many beautiful places on this planet and so little time. That picture just wouldnt look the same with a Motor home parked there. Bless the Westy.

Where is that? looks like somewhere in Colorado maybe?
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levi
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PostPosted: Tue Jul 10, 2012 5:28 pm    Post subject: Reply with quote

I wonder how well these work:

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http://bepo-usa.com/e-cooler.htm

It's just an evaporator, but it might work well in a dry climate like vegas.

We're at 113 today but only the usual 4 % humidity.
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Love My Westy
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PostPosted: Tue Jul 10, 2012 6:58 pm    Post subject: Reply with quote

Boostd wrote:
Love My Westy wrote:
My way of cooling down---go to the mountains!

Image may have been reduced in size. Click image to view fullscreen.


So many beautiful places on this planet and so little time. That picture just wouldnt look the same with a Motor home parked there. Bless the Westy.

Where is that? looks like somewhere in Colorado maybe?


It's in Wyoming, that's all I can say.
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PostPosted: Thu Jul 12, 2012 7:34 am    Post subject: if you really have a little extra money Reply with quote

http://www.aircraftspruce.com/catalog/elpages/flycoolackit.php


Cooling: 5,500 Btu/hr
Cabin Airflow: 350 CFM
Current: less than 35 amps
Weight: 22 lbs
Evaporator Size: 10 X 9 X 6.3
Condenser Size: 10" x 5.5" x 8.7"
Compressor Size: 9" x 6.6" x 6.7"
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Last edited by pushkick on Fri Jul 13, 2012 4:46 pm; edited 1 time in total
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PostPosted: Thu Jul 12, 2012 7:47 am    Post subject: Re: if you really have a little extra money Reply with quote

pushkick wrote:
http://www.aircraftspruce.com/catalog/elpages/flycoolackit.php
[/img]


$5600 Shocked Laughing
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PostPosted: Thu Jul 12, 2012 1:48 pm    Post subject: Reply with quote

Here is another evaporative cooler option.

http://www.google.ca/search?q=webasto+nitecool&ie=UTF-8&oe=UTF-8&hl=en&client=safari

Looks like it is popular on big rigs.
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luVWagn
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PostPosted: Sat Mar 09, 2013 6:14 pm    Post subject: Reply with quote

For me, i'm probably more interested in AC for driving, than for camping - since my Westy doesn't have AC, and all the aftermarket dash-installs seem quite invasive/extensive.

Couldn't a 12V (and ~25A) rooftop AC be used (perhaps mounted in the luggage rack or just behind the westy skylight)? And hey, potentially you could even power it when parked through a good solar setup? (although most folks with solar are also running a 12V fridge, so amperage draw might be an issue?)

Something like this one: https://www.roadpro.co.uk/images/pdfs/DC%20Airco%20brochure.pdf

They have a low-voltage cut-out switch too. Just needs a 14"x14" hole - easiest in the pop-top just aft of the skylight?

Not sure if these can be used while in-motion - don't see why not?

Edit: Hard to find any pricing, but the one place I did find (in the UK) was around 2500GBP Shocked ouch!
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Terry Kay
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PostPosted: Sat Mar 09, 2013 6:46 pm    Post subject: Reply with quote

Sure, you cold very well mount an 12 volt Ac unit on the Westfalia roof.

One question;
How you plan on reinforcing the top to support the weight of the AC unit??
And you do know that your still going to have to run the compresssor off of the engine.
The only thing that is 12 volt is the blower.

You don't want to be plumbing any AC component's into the dash, but yet you'd do it along with the roof mounted unit---
Huh---

I'd really enjoy seeing that roof top unit stuffed into the luggage rack.
Post some pictures of that when have that all done.

I think your looking for a quick fix here, and other than running a Colemann self contained 110 unit on the roof--there isn't any instant resolve.
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luVWagn
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PostPosted: Sat Mar 09, 2013 6:58 pm    Post subject: Reply with quote

Terry Kay wrote:
Sure, you cold very well mount an 12 volt Ac unit on the Westfalia roof.

One question;
How you plan on reinforcing the top to support the weight of the AC unit??
And you do know that your still going to have to run the compresssor off of the engine.
The only thing that is 12 volt is the blower.

You don't want to be plumbing any AC component's into the dash, but yet you'd do it along with the roof mounted unit---
Huh---

I'd really enjoy seeing that roof top unit stuffed into the luggage rack.
Post some pictures of that when have that all done.

I think your looking for a quick fix here, and other than running a Colemann self contained 110 unit on the roof--there isn't any instant resolve.


No doubt i'm looking for a quick fix - i know how much that bugs ya Wink

But if you look at the PDF I linked, it says nothing about running the compressor off of the engine. The unit is stated to be self-contained, 12V - just connect to the battery, and go.

Additionally, it is 30kg. I imagine mounted to the cab roof wouldn't be a problem (although you weaken the cab body structure by cutting a hole in the roof, i'd guess?), and i'm not sure that the 30kg couldn't be supported via some kind of bracket system aft of the skylight, or partially supported via a roof-rack cross beam.

Anyways, not saying I'm going to buy one and do it, especially since the pricing makes me flinch - more questioning whether it is feasible. You seem to think it isn't (but you also think it needs compressor-to-engine fitment)...
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Terry Kay
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PostPosted: Sat Mar 09, 2013 7:18 pm    Post subject: Reply with quote

Nope--I went back & read that iformercial.
It sucks more juice that your single house battery will put out overnight, a bunch of alernator amperage, and weighs in at 66 lbs.

I don't think you'd be mounting it up on the roof of your Westfalia.

I know--
A bank of batteries under the back seat, under the sink, a big output alternator, and a permantent roof rack to support it up on the roof, plus the cost & frieght for the unit --no problem.

What's the cost of Luxury?

You'd be better off with a Colemann & a gen set to run it.
Be cheaper anyway.

The roof won't support it any way you look at it--
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luVWagn
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PostPosted: Sat Mar 09, 2013 7:46 pm    Post subject: Reply with quote

Terry Kay wrote:
Nope--I went back & read that iformercial.
It sucks more juice that your single house battery will put out overnight, a bunch of alernator amperage, and weighs in at 66 lbs.

So what about on the cab roof? As is obvious, i don't know squat about whether you could cut a 14"x14" hole in the metal roof without compromising structure...

Additionally, as I noted in my post, i'm more interested in having AC while driving longish distances in hot weather - than I am in having it run when parked (unless a solar setup could adequately run it, or at least help the batteries keep up somewhat). So the house-battery concern is somewhat lessened.

And what about your earlier comments:
Terry Kay wrote:
And you do know that your still going to have to run the compresssor off of the engine. The only thing that is 12 volt is the blower.

...now that you've read the infomercial, were those comments incorrect?

Anyways, based on price alone, i'm not interested. But it could still theoretically be a viable option for tin-top vans in hot locations, if they didn't already have stock AC?
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subwayaz
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PostPosted: Sat Mar 09, 2013 7:55 pm    Post subject: Reply with quote

Syncro Pilot wrote:
Here is another evaporative cooler option.

http://www.google.ca/search?q=webasto+nitecool&ie=UTF-8&oe=UTF-8&hl=en&client=safari

Looks like it is popular on big rigs.


That looks pretty interesting and very low profile
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Terry Kay
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PostPosted: Sat Mar 09, 2013 11:22 pm    Post subject: Reply with quote

<<Additionally, as I noted in my post, i'm more interested in having AC while driving longish distances in hot weather - than I am in having it run when parked (unless a solar setup could adequately run it, or at least help the batteries keep up somewhat).>>

At 15 amps continuous, to run it.
You'll need a trailer load of batteries, and a solar panel bigger than the entire van to keep up.
Hows that solar panel work at night--good?

<<So the house-battery concern is somewhat lessened.>>
Totally negated would be a better way of saying it.

<<And what about your earlier comments:
[quote="Terry Kay"]And you do know that your still going to have to run the compresssor off of the engine. The only thing that is 12 volt is the blower.
...now that you've read the infomercial, were those comments incorrect?>>

On this side of the pond it is.
I'm not privy to what's going on in the Motherland, NZ, AU. or the EU group---

Historicaly , here in the US Kysor & Colemann were the main event's for roof top units.
Kysor uses an engine mounted compressor, Colemann uses 110.

<<Anyways, based on price alone, i'm not interested. But it could still theoretically be a viable option for tin-top vans in hot locations, if they didn't already have stock AC>>

Give it a shot--post back here with your results.
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PostPosted: Mon Apr 13, 2015 11:35 pm    Post subject: Reply with quote

I was just contemplating a rooftop A/C like this: https://www.youtube.com/watch?v=BJe5CQGN32k
This could keep things frigid and possibly could be tied into existing A/C ducting on a tin top van.
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PostPosted: Tue Apr 14, 2015 4:03 am    Post subject: Reply with quote

As low volt DC technology advances with leaps and bounds...... A viable DC Air Conditioner draws ever closer.

This unit is on the threshold but just barely.......

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PostPosted: Sun Mar 27, 2016 8:59 pm    Post subject: Re: RV Rooftop A/C anyone done this Reply with quote

Ecoflex 4e. 12v self contained. 100lbs.

http://cicionisprinter.com/products/ecoflex-rooftop-air-conditioner
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PostPosted: Mon Mar 28, 2016 5:39 am    Post subject: Re: RV Rooftop A/C anyone done this Reply with quote

Link says the 4E is 24 volt, takes 65 amps at 24 volts. So you need 4 of the big 6volt golf cart batteries to make 24 volts, 250 lbs of battery, to run the AC for about 2 hours before the batteries die.

Mark
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PostPosted: Mon Mar 28, 2016 7:49 am    Post subject: Re: RV Rooftop A/C anyone done this Reply with quote

That website also lists some 12V options. Would be awesome to have a small/efficient version for a Westy.
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PostPosted: Mon Mar 28, 2016 7:54 am    Post subject: Re: RV Rooftop A/C anyone done this Reply with quote

The one that lists 12v is smaller and lighter but with more cooling and says this:

" EcoFlex 6-
This model is the non-electric EcoFlex, ready to connect to the bus compressor. "

Mark
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PostPosted: Mon Mar 28, 2016 8:46 am    Post subject: Re: RV Rooftop A/C anyone done this Reply with quote

crazyvwvanman wrote:
The one that lists 12v is smaller and lighter but with more cooling and says this:

" EcoFlex 6-
This model is the non-electric EcoFlex, ready to connect to the bus compressor. "

Mark


I have seen a lot of compact DC roof units. Upon close scrutiny most of them are just an evaporation unit designed to work with a engine driven compressor. This configuration is very common on commercial fleet vehicles, including emergency services.

There are some compact Chinese roof mounts (like the one Dave posted a few posts back) that are truly complete DC air conditioners, with more reasonable BTU for smaller vehicles. No matter what efficiency, the energy takes to move that much heat is and will be non-starter for foreseeable future to come for off battery operation.

Thermodynamic efficiency does not improve overnight. Refrigeration, just like internal combustion engine, has over 100 years of evolution. The break through will come via not to reduce the energy required to operate, but the improvement of generating or storing of the big energy required.
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Last edited by chase4food on Mon Mar 28, 2016 9:28 am; edited 1 time in total
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