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Old 03-13-2014, 10:22 PM   #1
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Info about Coleman Polar Cub 9200btu A/C?

Does anyone have any experience with the Coleman Polar Cub A/C? It's about the mallest rooftop a/c unit I can find at 9200btu and for my little minibus I'd prefer to keep ti smaller. Just wondering if anyone knows the startup watts needed for this unit.

I have a '93 Chev minibus and am planning to take it through Oklahoma, Texas, New Mexico and possibly Kansas with several passengers this July and I'm not too eager to do that without some way to cool things down.

I already have a 200 amp alternator installed as well as a 3000 watt inverter. I won't be running the a/c while stationary, just while in transit.

I am WIDE open to suggestions here.

SDS
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Old 03-14-2014, 11:42 AM   #2
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Re: Info about Coleman Polar Cub 9200btu A/C?

According to Coleman that unit draws 11.5 full load (start up) amps (1380 watts) and 1010 - 1260 watts running. Your 200A alternator will put out 2400 watts max and the inverter will claim about 10% of that in the conversion from DC to AC so you'll get 2160 watts at max alternator output.

On paper it looks like it will work but maybe someone else will chime in on pitfalls I'm not aware of.
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Old 03-14-2014, 11:51 AM   #3
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Re: Info about Coleman Polar Cub 9200btu A/C?

I have seen several discussions on the coach forum in which folks have complained that their roof air did not work very effectively when used during driving. The consensus of opinions is that the rush of 60 mph wind through the evaporator did not allow for effective heat (cool) transfer and led to tepid cooling at best. Most shuttle buses have their A/C units either in the rear or on the side out of the gale, probably for this reason.
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Old 03-14-2014, 01:42 PM   #4
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Re: Info about Coleman Polar Cub 9200btu A/C?

Quote:
Originally Posted by ol trunt
I have seen several discussions on the coach forum in which folks have complained that their roof air did not work very effectively when used during driving. The consensus of opinions is that the rush of 60 mph wind through the evaporator did not allow for effective heat (cool) transfer and led to tepid cooling at best. Most shuttle buses have their A/C units either in the rear or on the side out of the gale, probably for this reason.
Interesting.

I would have guessed the opposite.

Nat
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Old 03-14-2014, 03:13 PM   #5
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Re: Info about Coleman Polar Cub 9200btu A/C?

I have wondered about that, it looks to me like the shape would set up a bit of a vacuum like bubble or eddy currents that would not allow air to flow properly through the unit. I wonder if small scoops or angled vanes on the side to direct air through it would improve that.....
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Old 03-14-2014, 06:08 PM   #6
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Re: Info about Coleman Polar Cub 9200btu A/C?

This is making my thought of doing a 120v mini split system all the more of a reason to do it? I seriously doubt that most 13k and 15k rv units put out that many btus. If I read correctly there is not organization or standard they have to adhear to (unlike residential units) so I would guess that a 9000btu or a 12000 btu mini split unit will cool a lot better than a rv unit.

I am REALLY wanting to test this theory?
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Old 03-14-2014, 09:18 PM   #7
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Re: Info about Coleman Polar Cub 9200btu A/C?

Bapos, I PM'D you on this.
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Old 03-14-2014, 09:52 PM   #8
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Re: Info about Coleman Polar Cub 9200btu A/C?

Some one needs to be the guinea pig with the mini split. If I ever do a AC in my bus, that's what I was going for.

I have a home owner that's looking at one. I may get to install one here before the heat sets in.

Nat
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Old 03-14-2014, 10:08 PM   #9
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Re: Info about Coleman Polar Cub 9200btu A/C?

I found two threads on other RV sites where the AC unit was successfully powered from the alternator. One suggestion was to include a couple of house batteries to buffer the system and another was to have fuses and breakers protecting everything. Otherwise, looks like it should work fine.

Found another thread where an RV AC unit wasn't cooling well when driving. Pulling off the cover cured his problem so it does seem that airflow over the body can potentially be a problem. Looks like the majority run theirs on the road with no issues.
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Old 03-14-2014, 10:30 PM   #10
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Re: Info about Coleman Polar Cub 9200btu A/C?

Quote:
Originally Posted by nat_ster
Some one needs to be the guinea pig with the mini split. If I ever do a AC in my bus, that's what I was going for.

I have a home owner that's looking at one. I may get to install one here before the heat sets in.

Nat
Those split systems look to be a natural fit in a bus. Mount the condenser in a vented belly bin or on the rear bumper and hang the evaporator wherever it's convenient. The two I looked at pulled a lot less juice than the same sized RV unit.
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