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Old 08-30-2008, 09:36 AM   #15
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For anything over 25' the 15k should be the ONLY unit installed. In your case having a 23', if you are in the hot areas of the country (or world) you won't go wrong with the 15k unit. 13.5k would do the trick, but the cost differences are small and the about 10% output BTU is noticeable. I posed similar questions when I was getting my Safari ordered. Folks here told me it would be a bad idea, that it would cycle too much that it was overkill, etc. In the end it was one of the very best decisions I made. None of the naysayers were right after 5 years of use in various climates (as I use the heat pump as well to save on LP when I can).

There was a time before I got my 25, that few, if any Safaris had the 15k BTU unit installed, within the last few years, it is not only an option, but is installed at additional cost upon request in most situations where there is not a written option for it and there is not as much discussion about it as I had to go through when I had mine built.
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Old 08-30-2008, 10:39 AM   #16
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13.5

I have a 20 ft globetrotter,with the 13.5k and it gets so cold you have to turn it down,and i camp on the beach in florida
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Old 08-30-2008, 03:34 PM   #17
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I have 13.5 on my 27 Ft Overlander,camping in S.Florida it is more than suffient,it will also run on 20 amp circuit. Dave
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Old 08-30-2008, 04:59 PM   #18
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Good to know... I've sure my AC won't need to compete with those doing the "Texas BBQ thing" but I'll probably opt for the larger unit.

The power use is only 80-90W more and most of the generators that I've been looking at should be able to handle it.
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Old 08-30-2008, 05:11 PM   #19
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Will the Yamaha 2400is run either of them? Oddly enough I am in the market for one of the low profiles myself so I am really wanting to know
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Old 08-30-2008, 06:05 PM   #20
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I have 13.5 on my 27 Ft Overlander,camping in S.Florida it is more than suffient,it will also run on 20 amp circuit. Dave
The 15 K's, also use a 20 amp breaker.

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Old 08-30-2008, 06:12 PM   #21
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Will the Yamaha 2400is run either of them? Oddly enough I am in the market for one of the low profiles myself so I am really wanting to know
Ball park, you can estimate the generator size requirement to run a motor with an inductive load, like your Airstream AC, at 1.5 times it's running current, "PROVIDED" you do not have another load on the AC except perhaps the univolt at standby and a very few lights.

If you want more than a minimal amount of other electrical things on, when your AC is running, then your generator rating should be twice that of the AC running current.

Smaller generators that do not not supply quite enough power, will cause the AC to have a shorter life.

It's not the running current that's the killer, it's the starting current.

Andy
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Old 08-30-2008, 07:48 PM   #22
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I was always told that also, (low current will shorten compressor life)
I have a 13.5 k unit on my 31 footer and it does great. If I could have gotten a bigger 1 for the same price I would have done it without hesitation. So will a 3500 generator run A/C? I was told go 5000. Now the question Arises.
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Old 08-30-2008, 08:20 PM   #23
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I was always told that also, (low current will shorten compressor life)
I have a 13.5 k unit on my 31 footer and it does great. If I could have gotten a bigger 1 for the same price I would have done it without hesitation. So will a 3500 generator run A/C? I was told go 5000. Now the question Arises.
Low voltage lowers a compressors life, not current.

When the voltage becomes low, the current increases, which in turn causes the compressor to over heat.

The over heating causes the short life.

Low voltage can be caused by a poor source of power, an inadequate wire size extension cord, poor connections, and a generator that cannot supply enough current.

Any generator, should never have a demand that exceeds about 75 to 80 percent of it's maximum output.

To be safe, along with using minimal other electrical loads, a generator that has a maximum rating of at least 4000 watts, should be selected to run the Airstream properly.

4000 watts x 80 percent = 3200 watts. With an AC running at 1800 watts, X 150 percent = 2700 watts. That leaves 500 watts to tinker with.

Any charging system, even at standby, will use perhaps 100 watts. Add a few light bulbs, and there you have it.

Also remember that all RV AC's running current, is also a function of the ambient temperature. The higher the temperature, the higher the current, which can exceed it's normal amperage.

Accordingly, when running an RV AC in moderate outside temperatures, is one thing. Operating them in a desert when the outside temperature peaks, is an entirely different matter. The running current will be greater than it's normal running current.

Running generators at maximum power, shortens their life.

Running an RV airconditioner on low voltage, shortens it's life.

As with most equipment, such as a generator, operating them at or near maximum output, will shorten it's life, as well as the AC.

You don't run your tow vehicle at maximum engine output, since you know besides speeding, it will shorten it's life.

A gasolene or LPG generator, will do the same, at or near it's maximum output.

That's why many owners start at 5000 watts, to begin with.

Andy
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Old 08-30-2008, 09:16 PM   #24
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Andy is right, the 15k unit also operates on a 20a circuit.

I ran the numbers and the min generator size to power the A/C unit would be 3000 watts. 3500 would be better for startups, but 3k per my conversation with Dometic (who makes my 15k unit) said that would be sufficient.

A lot of these generators have surge capability built in, but you can't go lower and think the surge can make up the difference. You need a 3k watt unit min and with surge capacity it will start the compressor without damaging it.
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Old 08-31-2008, 12:47 AM   #25
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yes... with the difference between the 13.5K and 15K being only 80-90W running, the larger issue if you plan it use a generator is the generator rating.

Using Andy's 150% multiple, if I understand correctly, means that we are looking at using a 3K generator minimum to get run the AC with the proper voltage.

Has anyone measured the voltage at the AC outlets inside the trailer with a Honda or Yamaha "Inverter" 2KW series?
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Old 08-31-2008, 01:26 AM   #26
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We have the 13.5 in our 69 25' and we've camped in over 100 degree heat and never had it above the low setting and it gets so cold we have to rotate between A/C and fan.
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Old 08-31-2008, 03:36 PM   #27
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Thank You Andy I have never been able to get that question answered directly until now. I to was considering a 5000 watt generator but wasnt sure if that was enought. So 4000 is good and that gives a little to spare. thank you. I have an onan but its a monster. I am considering a smaller Onan. Great unit it is.
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