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Old 09-13-2019, 04:26 PM   #1
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Best Mini Split Air Conditioner for Class A

I am looking for recommendations for the best mini split air conditioner to install in my 38 foot Pace Arrow. I'll be removing the two existing roof air conditioners right away. The most important feature would be the ability to run it nearly 24/7 in hot climates with a large solar system or shore power - so efficiency is a must.

Thanks!
Cari
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Old 09-13-2019, 10:02 PM   #2
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Keep in mind if you are removing 13or 15000 btu roof air conditioners with split system a/c units they will need to be similar btu units to get equal cooling. It will be a fair amount of work and use up more space. They should use similar power as newer roof air units.
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Old 09-13-2019, 10:11 PM   #3
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Biggest mini split on 120 volts is 12000 btu's They are efficient but must have room for the condenser portion, not so easy on a Class A, without using a lot of basement space. As far as running both units on a large solar system, I wish you luck. Even with efficient mini splits, you are looking at least 240 dc amps at 12 volts, when both are running. This would involve more solar than you could probably fit on a 38 footer, and of course a massive battery bank and maybe 4000+ watt inverter[s]. . Maybe could be done. Keep us posted.
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Old 09-14-2019, 06:24 AM   #4
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Check the specs, many mini-split units are only good for lower temperatures around 106-108 F and others around 120 F.
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Old 09-14-2019, 06:41 AM   #5
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Not practical. The mini split will take up an enormous amount of space compared to a standard RV rooftop air conditioner.
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Old 09-14-2019, 07:56 AM   #6
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Biggest mini split on 120 volts is 12000 btu's They are efficient but must have room for the condenser portion, not so easy on a Class A, without using a lot of basement space. As far as running both units on a large solar system, I wish you luck. Even with efficient mini splits, you are looking at least 240 dc amps at 12 volts, when both are running. This would involve more solar than you could probably fit on a 38 footer, and of course a massive battery bank and maybe 4000+ watt inverter[s]. . Maybe could be done. Keep us posted.
I was thinking of something along the lines like this. https://www.hotspotenergy.com/DC-air-conditioner/
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Old 09-14-2019, 09:30 AM   #7
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I was thinking of something along the lines like this. https://www.hotspotenergy.com/DC-air-conditioner/
That certainly would make it easier. But if you run only one for 24 hours a day they recommend 3600 solar watts which is pushing it, unless you strip everything off your roof.
Now you will need an 48 volt charger, for running on shore power or generator. As your batteries are now wired for 48 volts you will have to devise a 48 to 12 converter to supply 12 volts to the coach. All doable with enough money thrown at it.
The big problem will be the outside [condenser] units. It needs to be able to suck air from a cool place and discharge it away from the unit. If in a bay probably the door and the floor will have to have vents in them, and even then some of the hot air discharged under the coach will be sucked in the suction side of the unit.
You are going to need a big battery bank 1600+ amp hours, would suggest you go to lithium-ion to save weight and space.
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Old 09-14-2019, 09:41 AM   #8
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how and where are you gonna mount these 4 pieces of equipment?? and run gas lines and electric to them??
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Old 09-14-2019, 09:44 AM   #9
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That certainly would make it easier. But if you run only one for 24 hours a day they recommend 3600 solar watts which is pushing it, unless you strip everything off your roof.
Now you will need an 48 volt charger, for running on shore power or generator. As your batteries are now wired for 48 volts you will have to devise a 48 to 12 converter to supply 12 volts to the coach. All doable with enough money thrown at it.
The big problem will be the outside [condenser] units. It needs to be able to suck air from a cool place and discharge it away from the unit. If in a bay probably the door and the floor will have to have vents in them, and even then some of the hot air discharged under the coach will be sucked in the suction side of the unit.
You are going to need a big battery bank 1600+ amp hours, would suggest you go to lithium-ion to save weight and space.
Please explain
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Old 09-14-2019, 10:02 AM   #10
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Please explain
Not sure what you need?
Batteries are wired for 48 volts to run ac. He will need a dc to dc converter to supply 12 volts for his coach systems.
This one would work, but would probably need a bigger one.
https://www.invertersupply.com/index...Q6FKysRZnkvm4n
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Old 09-14-2019, 01:13 PM   #11
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Actually Newell ran a type of mini split for years. Condensers and compressors were in the compartment under driver seat, and one evaporator in bedroom. and two evaporators, one under couch and one under sink in fwd coach. Condensers used squirrel cage blowers to direct air away from condenser through ducting, not so easy with a fan type in a bay.
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Old 09-14-2019, 07:10 PM   #12
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This one isn't a DC mini split but has a very good seer rating. Would it work?

https://www.ecomfort.com/Mitsubishi-...YaAqt0EALw_wcB
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Old 09-14-2019, 11:14 PM   #13
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This one isn't a DC mini split but has a very good seer rating. Would it work?

https://www.ecomfort.com/Mitsubishi-...YaAqt0EALw_wcB
It does have a good rating, but is 208/230 volts and at 6000 btu's, probably not suitable for the OP.
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Old 09-15-2019, 03:22 AM   #14
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It does have a good rating, but is 208/230 volts and at 6000 btu's, probably not suitable for the OP.
C5c5 is the OP.
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