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Old 07-09-2016, 06:27 PM   #1
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Default Video of Roadtrek under floor Pro Air air conditioning option...

https://m.youtube.com/watch?feature=share&v=wBF0xf6IxGk
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Old 07-09-2016, 07:25 PM   #2
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18,000 BTU dual compressors 12v system. They said running full out it uses 160a and when one compressor is turned off after getting desired temperature it drops to 100a. This is probably the system or similar Wendland and Campskunk have been testing for some time now.

I'm a little ambivalent about it. You are basically moving a mass of space to under the floor where other things can be utilized and then ducting it through potential cabinet storage space all clearing up roof space for more solar. I'm not sure that is worth adding maybe 100-200 watts of more solar. With high amp hour battery banks and under hood dual alternators I think solar makes much less contribution.

The stealth aspect would be interesting but immediately lost with that awning. The ceiling exhaust fan is still a must, IMO.

The 12v system is good. I was willing to be a test dummy for a 12v system Advanced RV was researching and testing but they decided it wouldn't work for them. Supposedly it would draw a low of 85a vs about 140a. My theory was I don't run air conditioning much anyway.
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Old 07-09-2016, 07:48 PM   #3
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I am planning on a 12VDC under-chassis A/C upgrade eventually. My primary motivation is not extra solar, but rather quiet operation. ALL the roof-top units are unacceptably noisy. Extra run-time on battery will be nice, too. Stealth is just a bonus for us.

My problem with the RT setup is that it is WAY too big. 18K is just unnecessary. Indeed, it is not even desirable, since it reduces effectiveness at dehumidification, which is more important for comfort than temperature reduction. The ideal A/C size is the one in which the unit just keeps up when running continuously in a given environment. I'm sure this one would cycle constantly under most conditions. 160A is nuts--my current 11K unit is already probably too big, and it draws less than 110A even running through the inverter. There are very nice DC split units that use dual Danfoss compressors that max out at 6 or 8K. Makes much more sense, unless you live in Panama.

BTW: These systems are NOT ducted up from the floor. The evaporators are generally mounted in a cabinet. They are not overly large. I can easily fit one in the under-utilized top cabinet at the very rear of our Legend, while still having room for our bedding. I plan to have the air ducted downward toward the bed.
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Old 07-09-2016, 11:57 PM   #4
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I am planning on a 12VDC under-chassis A/C upgrade eventually. My primary motivation is not extra solar, but rather quiet operation. ALL the roof-top units are unacceptably noisy. Extra run-time on battery will be nice, too. Stealth is just a bonus for us.

My problem with the RT setup is that it is WAY too big. 18K is just unnecessary. Indeed, it is not even desirable, since it reduces effectiveness at dehumidification, which is more important for comfort than temperature reduction. The ideal A/C size is the one in which the unit just keeps up when running continuously in a given environment. I'm sure this one would cycle constantly under most conditions. 160A is nuts--my current 11K unit is already probably too big, and it draws less than 110A even running through the inverter. There are very nice DC split units that use dual Danfoss compressors that max out at 6 or 8K. Makes much more sense, unless you live in Panama.

BTW: These systems are NOT ducted up from the floor. The evaporators are generally mounted in a cabinet. They are not overly large. I can easily fit one in the under-utilized top cabinet at the very rear of our Legend, while still having room for our bedding. I plan to have the air ducted downward toward the bed.
one thing to keep in mind. 2 people-one a roadtrek owner and one a sportsmoblile owner have this system and say it is very loud underneath
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Old 07-10-2016, 12:07 AM   #5
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one thing to keep in mind. 2 people-one a roadtrek owner and one a sportsmoblile owner have this system and say it is very loud underneath
Right. Thanks for the reminder. That is another disadvantage of an oversized system. Some of the other alternatives are reported to be much quieter. Also, my main concern is indoor noise.
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Old 07-10-2016, 12:11 AM   #6
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Talking

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Just turn on the fan,
open the window,
and enjoy the nature.

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Old 07-10-2016, 02:46 AM   #7
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one thing to keep in mind. 2 people-one a roadtrek owner and one a sportsmoblile owner have this system and say it is very loud underneath
What might be even louder underneath is the groaning from the poor pilgrim that has to repair or replace it. Right behind that decibel level is the groaning from the owner that has to pay for it. This whole thing seems like an expensive and overly complicated solution to a non-existent problem.
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Old 07-10-2016, 02:13 PM   #8
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When I first heard about this I thought it was a great idea, because I thought it would be very quiet. Now, seeing it for the first time, I can't help but wonder what it will look like after a few years of driving around in the rain, dusty roads, and salt spray in the winter. Being behind the rear wheels seems like the worst place to be.
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Old 07-10-2016, 02:40 PM   #9
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I agree with Davydd that with the 100-160 amp draw there does not seem to be the power savings vs a roof air that Roadtrek is touting. With no power savings and not much quieter and the only benefit being room for 200 watts more solar and the stealth factor I don't see the point in having an A/C that will be a challenge to get serviced and under the van where it can be damaged.

They are not likely to offer a lower power option since people will complain that it cannot cool the van on a hot day no matter where it is located. ARV would do it if the customer wanted it and understood the limitations (e.g., Solar Womp) but the major Class B builders will stick with high btu, high power units to satisfy the majority of their customers.
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Old 07-10-2016, 03:25 PM   #10
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When I first heard about this I thought it was a great idea, because I thought it would be very quiet. Now, seeing it for the first time, I can't help but wonder what it will look like after a few years of driving around in the rain, dusty roads, and salt spray in the winter. Being behind the rear wheels seems like the worst place to be.
I haven't thought this through yet, but when I do my project I am going to investigate whether building some kind of weatherproof enclosure might be a good idea. A little complex due to air flow issues. I am not sure it is necessary, though. Compressors are sealed. As for the rest, it is not clear to me how much worse an under-vehicle location is than being stuck up front behind the grill in a traditional automotive setup, especially if there is some kind of deflector in the configuration. It helps that (at least in my case) it only has to run when the vehicle is not in motion. In the extreme, one could imagine an actuator-controlled door or grate that opens only when the unit is in operation. I really doubt that this will be necessary, though.
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