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Old 06-21-2013, 07:56 PM   #1
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Generator vs. AC question...Opinions wanted

We just got out 2014 Rockwood Roo 21SSL and have some decisions to make.

We have a Airxcel 48000 Series (Coleman) AC 13,500 BTU. Got home and couldn't run AC on garage outlet. Well it would start and within 2 minutes flip breaker. Plugged into our EU Honda 3000is and ran a few minutes and created overload alarm. Researched, read, and educated myself on these forums. (Service manager today said I seem to know more than most, all because of the info here). Generator last week ran our prior RV 13, 500 AC, plus and bogged a little with everything plus microwave. Felt generator wasn't the problem. Had it checked any way and it is putting out a little over what it should at 25 amps. Took new RV back today to have the AC tested and it puts out 28-29 amps at start up and then backs down to 14-15 amps. Thought might have a capacitor issue. Service department called Coleman since it would be warranty work and there isn't a start up capacitor and they have re-designed their AC to work as described above as they believe this is best for their compressor and it passed all of the UL and what not testing and ratings. This was new news to the service guys also...

So we are left with needing a bigger generator or they suggested a more feasible option might be replacing our AC to one without such a draw at start up. We have a lot to weigh as our current generator has the convenience of the remote start and is paid for. I did check and was told that if they put a new AC in I would have that warranty and it wouldn't affect our extended warranty that we purchased with the unit. Opinions wanted! This manufacturing change in AC makes this 13,500 unit one of the few that won't work with a 3000 generator. What would you do and why? I appreciate all opinions as we now have to spend more $$$ either way on top of purchasing the new RV.
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Old 06-21-2013, 08:20 PM   #2
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I believe they sold you a load of crap!
With a camper only have 30 amp service why would they put an a/c on it that draws 28 amps to start up?
Imo something's wrong .
What is the model number of your a/c?

Turbs
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Old 06-21-2013, 08:21 PM   #3
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First thing is to make sure the generator is only powering the AC and not water heater at same time. Shut all other AC breakers off and only run Air Conditioning and see if OK or not. You should be OK.
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Old 06-21-2013, 08:46 PM   #4
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Quote:
Originally Posted by f1100turbo View Post
I believe they sold you a load of crap!
With a camper only have 30 amp service why would they put an a/c on it that draws 28 amps to start up?
Imo something's wrong .
What is the model number of your a/c?

Turbs
Totally not true.

Mine can draw 25 amps to start with the mods in place when the line voltage is low. Today while I was working on it (the camper), the line voltage was 115 volts.

It is only for 5 seconds or so, but easily seen on my AC amp display.

Running amps is about 14.9 amps (compressor and fan).

To be UL Listed, the start up amps can not be more than 1.56 times the rated Load amps.

The compressor needs 11.9 volts @ 115 Volts (start up voltage 11.9 * 1.56 or 18.56 amps JUST for the the compressor. Then (without the fan mod) you have to add the start up amps for the fan (3.4 running * 1.56 = 5.3 amps).

That is 23.86 amps @ 115 volts. As the voltage drops due to extension cords, area usage, brown outs, that start up amperage can spike right up there above 30 amps for a properly operating air conditioner.
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Old 06-21-2013, 08:50 PM   #5
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might want to mention to Coleman that a 28-29 amp startup is unacceptable and that this disturbing information is going out to all the forums so that NOBODY buys that unit, EVER. You may be able to retrofit a startup capacitor AKA Turbs posts rather than change out the unit.?
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Old 06-21-2013, 08:57 PM   #6
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Maybe they changed their AC units but my Coleman is a 2013 & it starts with a Yamaha 2400.

Turbs is right, nothing else can be on to get it started.
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Old 06-22-2013, 12:55 AM   #7
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Thanks for everyone's response! Although I did trust the service department today, because they seemed just as shocked after talking with Coleman, I think I may call Coleman for more information. My model number is 48253C966. After digging online tonight I made my way into Coleman's Literature & Technical Documents and finally found my model number which is "NO LONGER IN PRODUCTION" and the recommended replacement for my model would be 48203C966. Under technical data sheet it lists a cooling full load AMPs at A.R.I. standard conditions at 12.4-13.1 amps accounting for the compressor and fan motor. Although I agree that some units could draw more, I do think that with a 30 amp service an AC that draws 28-29 is crazy. Take my generator out of the mix and at a camp ground on 30 amps, I would have to turn everything off to start the AC, again crazy! I will call Coleman Monday to see what they say is proper start up and running amps for my model number to see if I get the same answer. My 21SSL is 31 feet and 8 1/2 of that is ATV bed, so really 23 feet of that is camper. Why would you have a AC that pulls so much initially on this size unit? It is not a larger toy hauler with a bulit in larger generator. This unit requires a portable generator and I feel that an AC that draws 28 amps initially (crazy, but if normal for this model) is not appropriate for Forest River to have placed on this RV. Well it basically locks you into parellel 2000's to start the AC or a beasty 4500 that is not so portable. Just a frustrating situation, but before I part with any $$$, I will call Coleman and get the specs to see if they match what I am finding in their documents online. I don't know the manufacture date of my unit but if no longer in production and found their way to a 2014 RV, they must have been sitting around at Forest River waiting to be placed on RV

Am I correct that full load amps would be start up and running load amps would be what it backs down to?
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Old 06-22-2013, 01:35 AM   #8
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There has also been a prior thread where people have placed a delay timer on the fan as well as the hard start cap but its kind of odd that it would drop while running an not at startup.
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Old 06-22-2013, 01:49 AM   #9
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Originally Posted by wneise View Post
There has also been a prior thread where people have placed a delay timer on the fan as well as the hard start cap but its kind of odd that it would drop while running an not at startup.
Yes you can search my threads for fan mod.
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Old 06-22-2013, 01:56 AM   #10
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Originally Posted by herk7769 View Post

Totally not true.

Mine can draw 25 amps to start with the mods in place when the line voltage is low. Today while I was working on it (the camper), the line voltage was 115 volts.

It is only for 5 seconds or so, but easily seen on my AC amp display.

Running amps is about 14.9 amps (compressor and fan).

To be UL Listed, the start up amps can not be more than 1.56 times the rated Load amps.

The compressor needs 11.9 volts @ 115 Volts (start up voltage 11.9 * 1.56 or 18.56 amps JUST for the the compressor. Then (without the fan mod) you have to add the start up amps for the fan (3.4 running * 1.56 = 5.3 amps).

That is 23.86 amps @ 115 volts. As the voltage drops due to extension cords, area usage, brown outs, that start up amperage can spike right up there above 30 amps for a properly operating air conditioner.
Although I don't believe the op in that his may draw 28 amps I think its whoey that it should be considered "normal"
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