Polar Cub AC in a Bigfoot? - Page 2 - Fiberglass RV


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Old 02-16-2007, 10:16 AM   #15
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Trailer: Bigfoot 25 ft (25B25RQ)
Colorado
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Quote:
Its been a long time but I probably could do a BTU load calculation for your camper. I would need a drawing of your camper r value of the insulation window sizes door sizes and the worst case summer place you plan to take your camper. Let me know if yoiu want me to doit I will dig out my old hvac j manuals

Don
Don - This is a very generous offer. If you really are willing to do this here is the info you asked for:

1. I could send you a drawing or you can look up the floor plan drawings for the Bigfoot 25B21RB model. This on the bigfootrv.com website. Since they didn't include dimensions with the drawings I measured the inside of my trailer and came up with: 202" long (16.8')
92" wide(7.6') and 76" high (6.3') The conversions in ( ) are in feet and decimals, not feet and inches.

2. Bigfoot states that the insulation has an R value of 8.

3. There are six windows in the living area and one in the bathroom measured as follows:
1. 20X32
2. 20X32
3. 20X38
4. 14X38
5. 20X44
6. 20X36
7. 14X18 (bathroom)
These measurements are of the glass. Bear in mind that these are double paned thermal windows.

4. There is one door to the outside measuring approx. 24X67.

As for worst case climate scenario, that is a tough question. I plan to stay home during the worst heat waves but that doesn't always work out. Lets just find out if this trailer can be made comfortable if the outside air temp is in the high 90's. Since I often travel from the South to the Southwest, I am liable to experience a very wide range in humidity.

Let me know what you find out. Again, that you very much for offering to do this.
Dave
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Old 02-20-2007, 09:37 AM   #16
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Dometic have a "Quick start" kit (Part # 3102903.006) that can be mounted on Duo-Therm roof top mounted air conditioners.
According to some owners posting in the Honda 2000 Generator Yahoo group, the soft start kit, will enable the Honda 200 to run the Duo therm 11000 BTU.
I have not yet tried this , but I intend to.
Colin
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Old 02-21-2007, 09:26 AM   #17
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And if you decide you have to have an additional Honda;
http://www.fiberglassrv.com/board/index.ph...p;hl=honda+deal

I'd bring it up with the wife that it's going to cost 1100.00 then tell her you found a GREAT deal. That should soften the blow.
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Old 02-22-2007, 10:34 AM   #18
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Colin: Do you already have an 11000 BTU A/C? That Quick Start looks like a great idea. I have read on another forum that it really smoothes out that initial power demand of the compressor starting up.
Lizbeth: I appreciate the link to the Honda deal. I am still determined to keep this project simple, though.

So here is the latest chapter. Yesterday, I asked my local RV dealer to order a new Polar Cub A/C for me. (By the time I calculated shipping they were able to match the best deal I could find on the internet.) Then someone in the service department said they had a Polar Cub in stock. So they installed it in my Bigfoot yesterday morning. When I got home and looked at the paperwork, I noticed that the model number didn't look right. When I looked up the data sheets on the net, I found that they had installed the now obsolete "D" series model that has 7680 BTU's. When I went back to the dealership, they immediately said they would order the new model and swap it out free of charge. Thankfully, they were very gracious about this. If any of you out there are considering a Polar Cub the current model with 9200 BTU's is 9201B. The company, Coleman-Mach, made a 7680 BTU model, then an 8300 BTU model. The currently-made 9200 BTU model only needs ten more watts than the 7680 (1010 vs 1000). That is a lot more output for very little more power demand.

I will report back on the efficiency of this A/C in my Bigfoot when it gets hot enough. Thanks again for all the input.
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Old 02-22-2007, 08:48 PM   #19
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David.
I have a Duo therm 11000BTU on my 19' Bigfoot and it does an excellent job cooling the unit. I have a recently bought a Honda 2000 and have not yet hooked it up to the Bigfoot. I understand (and hope) that the Soft- start Kit is relatively inexpensive. I will give it a try and if it does not work, I will not be out of pocket very much. I do not want the expense and complication( and double the sound output) of tandem 2000's.
When it gets a little warmer in B.C. I will test and report.

Colin
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Old 02-23-2007, 08:25 AM   #20
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Trailer: Bigfoot 25 ft (25B25RQ)
Colorado
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David.
I have a Duo therm 11000BTU on my 19' Bigfoot and it does an excellent job cooling the unit. I have a recently bought a Honda 2000 and have not yet hooked it up to the Bigfoot. I understand (and hope) that the Soft- start Kit is relatively inexpensive. I will give it a try and if it does not work, I will not be out of pocket very much. I do not want the expense and complication( and double the sound output) of tandem 2000's.
When it gets a little warmer in B.C. I will test and report.

Colin
Colin,
I will be very interested in your results. If the Polar Cub proves to be inadequate, that sounds like a very good alternative. I am determined to try to keep cool within the power limitations of one Honda 2000. It is currently the state-of-art boondocking generator in terms of portability, noise level, and fuel consumption. Doubling all that would be counter-productive. Since you already have the factory installed A/C, I think you are onto a good idea with the soft-start kit. Hope it works well.
Dave
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Old 03-01-2007, 12:54 PM   #21
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This story has developed more twists and turns. It turns out I was completely wrong that the current production model of the Coleman Polar Cub is 9200 BTU. I have been in contact with the factory tech (RV Products Inc.) who told me that the 7700 BTU unit is the only model now being produced. He went on to say that he didn't think the 7700 BTU model was anywhere near adqequate to cool a 21' trailer. I had been led to believe that all new Polar Cubs were 9200 BTU because of a data sheet link in the RV Products website, as well as reading that info on some other RV forums.

Now for the good news. The RV Products tech highly recommended their Polar Mach I Power Saver a/c. This unit has 11000 BTU, but only requires 1307 watts in maximum condition mode and 1048 watts in standard condtion. He said that the Honda 2000 will start and operate the Polar Mach. So instead of swapping out my 7700 BTU for a 9200, I'll be getting the Polar Mach I. This has the same BTU output as the Duotherm a/c that Bigfoot installs, but requires less energy. Exactly what I need - if all the facts turn out to be true. I am already confident it will be cold enough, I just need to find out whether my Honda will definitely make it work.

Needless to say, I didn't know one thing about RV air conditioners when I lived in Alaska. Now I am in a frenzy to resolve my cooling issues before the dreaded southern summer hits me.
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Old 03-01-2007, 03:58 PM   #22
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Hi: David...The only thing I know for sure around here is that no mater what kind of A/C unit you own it won't break down in the middle of WINTER
Alf S. North shore of Lake Erie
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Old 03-08-2007, 10:31 AM   #23
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The Polar Mach I A/C was installed today. After testing it on shore power, I then hooked up to the Honda 2000. I let it run for about 30 minutes and it seems to operate just fine. I tried the eco-mode feature and it still operated the a/c, but I don't know how close I was to maxing the demand. Either way, we will have to be careful not to use microwave, coffee maker, etc with the a/c on, while on generator. We were already doing that in the Casita, so this operation will be no different. Anyway, this was a roundabout road, but I think I was successful in keeping this Bigfoot compatable with my little generator. Thanks for all your opinions and suggestions out there.
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Old 03-20-2007, 12:01 PM   #24
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Can you tell me the model # AC unit you put on the trailer? it seems you can pick from 3 models on the web site.
Quote:
The Polar Mach I A/C was installed today. After testing it on shore power, I then hooked up to the Honda 2000. I let it run for about 30 minutes and it seems to operate just fine. I tried the eco-mode feature and it still operated the a/c, but I don't know how close I was to maxing the demand. Either way, we will have to be careful not to use microwave, coffee maker, etc with the a/c on, while on generator. We were already doing that in the Casita, so this operation will be no different. Anyway, this was a roundabout road, but I think I was successful in keeping this Bigfoot compatable with my little generator. Thanks for all your opinions and suggestions out there.
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