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Old 08-22-2018, 11:12 AM   #1
Mini-Skoolie
 
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Mini split vs rv roof top unit

Been trying to figure out what I'm going to do for a/c. Does anybody have any preferneces either way? Is one more efficient then the other? I dont know much about any of these units but I plan on being in open sun alot during The summer and where I'm located it can easily reach 100 degrees with 100 percent humidity on and average summer day. So any thoughts or advice on the subject are appreciated
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Old 08-22-2018, 11:30 AM   #2
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Oh my... there are plenty of opinions on this!!

Your situation sounds like about the worst possible scenario. I wonder if it can even be handled?? Obviously, LOTS of insulation is an absolute must!

It appears you have a mini but nothing else is obvious. Can you shed some more light on the situation? I assume you are going to have shore power? How much (30 amp or 50 amp hookup)?
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Old 08-22-2018, 11:35 AM   #3
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I've got a full sized rear engine bus. Ceiling has 2 inch of spray foam insulation and walls are insulated with 3 inches of foam board insulation and reflective behind that. I took out about half of all the windows.
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Old 08-22-2018, 11:45 AM   #4
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Oh my... there are plenty of opinions on this!!

Your situation sounds like about the worst possible scenario. I wonder if it can even be handled?? Obviously, LOTS of insulation is an absolute must!

It appears you have a mini but nothing else is obvious. Can you shed some more light on the situation? I assume you are going to have shore power? How much (30 amp or 50 amp hookup)?
If you are assuming he has a mini due to "Mini Skoolie" under his name, you would be mistaken. The line is site generated and changes on post counts. Did you put that you are a bus nut under your name?
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Old 08-22-2018, 12:05 PM   #5
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Yes, I was making that assumption. I was searching as deeply as possible trying to find some bit of information to help the OP. I had not even noticed what was under my name. I am terribly sorry that I offended. Perhaps a stronger public lashing is due? Or, perhaps some useful bit of information for the OP about this particular topic?? Wanna tell me what power source he/she has available??
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Old 08-22-2018, 02:47 PM   #6
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Yes, I was making that assumption. I was searching as deeply as possible trying to find some bit of information to help the OP. I had not even noticed what was under my name. I am terribly sorry that I offended. Perhaps a stronger public lashing is due? Or, perhaps some useful bit of information for the OP about this particular topic?? Wanna tell me what power source he/she has available??

Without making assumptions, no I can't tell you anything. That's why it is important when joining a forum to fill out your profile so we at least have an inkling of what we are dealing with and that you want to be part of the community.
You didn't offend me or anyone else likely. I, like you had no answer for the OP with no info to start with.
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Old 08-22-2018, 05:51 PM   #7
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I think this has been discussed many times on this forum. The inverter type mini splits are more efficient, quieter and harder to install and pretty much have no warranty when installed in something that moves. The RV roof airs are noisy and easy to install.
That being said, I have two 12,500 btu mini splits that have kept me quite comfy when sitting in the sun at about 95 degrees. Don't know the humidity but it was quite high. I have a white roof and whatever insulation came in the ceiling. About 1.5" of the pink Styrofoam in the walls and 2". All of the school bus windows are gone, all of my larger windows are double pane.
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Old 08-22-2018, 05:58 PM   #8
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You can also easily find used working rooftop units cheap
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Old 08-22-2018, 06:04 PM   #9
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Haveing used rooftop units in campers, my bus and other applications, it is likely you would need 3 units of 15,000 btu's each during the hottest part of the day. So 45,000 btu or so. I have heard good things about mini splits, but have not used one yet. The noise from rooftop ones is not bad, but is enough after a while to be a bother if you are noise sensitive.
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Old 08-22-2018, 06:09 PM   #10
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Haveing used rooftop units in campers, my bus and other applications, it is likely you would need 3 units of 15,000 btu's each during the hottest part of the day. So 45,000 btu or so. I have heard good things about mini splits, but have not used one yet. The noise from rooftop ones is not bad, but is enough after a while to be a bother if you are noise sensitive.
I spent quite a bit of time in my first bus in 100F+ temps.

I had two 12k btu roof air's and two inches of spray foam insulation.

If I had three root air's as Ronnie suggests I probably would have been comfortable.
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Old 08-23-2018, 06:08 AM   #11
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Right now I have a 13kbtu window unit installed in the back of the bus wall bulkhead above the engine. I was thinking of getting 2 advent 15kbtu rv air conditioners as well. At the moment electric is not installed in bus but when finished I'll be able to run off of solar with a 700amp hour battery bank,shore power haven't decided 30amp or 50 amp yet or my 9000watt generator. So all together that would be 43kbtu you guys think that'll be enough to keep us cool?
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Old 08-23-2018, 06:21 AM   #12
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I can't answer the question but can tell you that 30 amp shore power is really not enough for two roof A/C units (of the size mentioned).

On paper, it is (barely). From what I've seen in real life, this pushes things too far. I suspect this is because of all the other things that may also be running simultaneously (refrigerator, microwave, cooktop, coffeemaker, water heater, etc.). It works if you are careful to control the load. 50 amp is far better (since it is actually a total of 100 amps (@110VAC)).

Regardless, you'll need 50 amp if you plan to take full advantage of your 9000 watt generator.
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Old 08-23-2018, 06:55 AM   #13
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Thanks for the advice. I'm not savvy when it comes to electrical. I plan on outsourcing that project to a local car audio place that specializes in party buses a things of that nature
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