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Old 05-27-2018, 06:36 PM   #1
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Question Converting ceiling A/C to both engine and outlet power?

Hello! I have a mini bus and it has a ceiling a/c unit at the back that can run while the engine is on via a switch at the front. I'm interested in converting this to both engine power when driving and then being able to plug it in while I'm at a campsite (to an extension cord, which will be plugged into an outlet). Is this even possible? Thanks!
(sorry the picture is upsidedown!)
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Old 06-22-2018, 07:43 PM   #2
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I'm having the same question, bus is in hand next week.
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Old 06-22-2018, 09:00 PM   #3
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Maybe.


I'm going to try to do the same thing with my roof-mounted HVAC. My HVAC is a 10-ton unit (yes, 10-tons o' cooling!). The compressor in the engine compartment is huge! (I have a transit bus, not a skoolie, but oh, well....)



I'm going to try and plumb in one or two 1- or 2-ton compressors that run off of DC through check valves. I'm hoping the TxVs (yep, 2 of 'em) don't let too much refrigerant through in their fully-closed position so the smaller compressors can build up the required pressure....


For your situation you'll need to find out if your TxV is mechanical or electronic. Mechanical is what you want - electronic, well, that complicates the issue....



Best person to talk to in these parts is cadillackid....
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Old 06-22-2018, 09:27 PM   #4
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We are trying to do that as well. We disconnected the V belt from the main diesel engine to the compressor and reconnect it to a small diesel and a large 5 Hp DC motor. So for on the road and boon docking we will use the small single cylinder diesel engine and for campgrounds with electric hookup we will run the DC motor.
I want to same with our e350 mini bus but only then a smaller DC motor that can be easily connected when stationary.


Good luck, J
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Old 06-23-2018, 08:10 AM   #5
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Originally Posted by joeblack5 View Post
We are trying to do that as well. We disconnected the V belt from the main diesel engine to the compressor and reconnect it to a small diesel and a large 5 Hp DC motor. So for on the road and boon docking we will use the small single cylinder diesel engine and for campgrounds with electric hookup we will run the DC motor.
I want to same with our e350 mini bus but only then a smaller DC motor that can be easily connected when stationary.


Good luck, J

My compressor needs 30 horses to run (at least according to the docs I have). I don't think a DC motor or single cylinder engine will do the job or I'd do it your way. Very clever!
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Old 06-23-2018, 01:17 PM   #6
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MarkeeDee., I do not think it works like that. If you would ask the full capacity then your compressor would demand that kind of HP. Look at the capacity / RPM curve of your compressor and see how much HP your compressor needs for a cooling capacity that you require for a bus not in motion. Just drive it with a 1 or 2 HP AC motor with a proper pulley ratio and see what happens. It wont be as efficient as a split ac. Every thing is oversized for the capacity that an insulated bus requires so you will have more mechanical friction and other losses.



Later J
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Old 06-23-2018, 03:11 PM   #7
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Quote:
Originally Posted by BrittanyJ707 View Post
Hello! I have a mini bus and it has a ceiling a/c unit at the back that can run while the engine is on via a switch at the front. I'm interested in converting this to both engine power when driving and then being able to plug it in while I'm at a campsite (to an extension cord, which will be plugged into an outlet). Is this even possible? Thanks!
(sorry the picture is upsidedown!)



The engine drives your compressor. When plugged into 110v, your bus isn't running, so no, a/c will not work as you wish. You will need at the minimum a second a/c that has an electrically driven compressor.


John
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