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Old 09-23-2020, 11:08 PM   #61
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Many 30 amp coaches run two air conditioners with no problem...but you're right. Beyond the two AC's you have too be frugal!
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Old 09-23-2020, 11:09 PM   #62
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Originally Posted by Chance View Post
Both inside and outside temperatures make a huge difference. See Coleman data below that ďapproximatesĒ effect outside temperature makes. Thereís other data for inside temperature. This isnít that accurate so donít take it as an exact correction.

Note also on 13,500 BTU/hour Power Saver data above that standard running Watts is 1,075 but that desert conditions is 1,320 Watts. Assuming same efficiency, power factor, and that voltage is reduced from 115 to 103.5 VAC per desert rating conditions, current would go from 10 Amps to over 13 Amps.
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I just saw the same thing, so in my area 95 would be the high and that would be RLA let's say 13 amps at 80 degrees it would be about10 amps
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Old 09-24-2020, 09:15 AM   #63
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Originally Posted by Chance View Post
The best news is how much air conditioners have improved in efficiency, and that thereís still theoretical room for even more improvement.



A few years ago Coleman advertised how their 13,500 BTUH A/C reduced current from 15.3 to 11.2 Amps, and now they have specs showing 10 Amps. That 10 Amps is 1,075 Watts, which represents an EER of 12.5. Thereís definitely room to make that EER much higher and thus reduce electrical requirements below 10 Amps.



Even at 10 Amps, two units for a total of 20 Amps is quite below 30A service.





P.S. ó Iím a little skeptical about 10A rating and would want to see/measure myself, but even if close, itís pretty good.

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My 1500 watt units draw 12 amps on high typically

Maybe an amp difference between the three at 120v per line

You can watch the amps climb when a camp ground has a high load
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Old 09-24-2020, 09:27 AM   #64
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We have several large heat pumps at one home

The only correct to charge a 410a system is to use the sub cooling value for that particular compressor

Both outside and inside temperatures affect a compressor and condensr performance

You have to monitor the high side temp along with pressure to accurately charge

High temperatures do result in higher amp draw
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Old 09-24-2020, 10:01 AM   #65
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Originally Posted by Rcstroll View Post
Hi! Have 50 amp as well. Was able to use 2 a/c units on it and thought that i was doing great! I was... after 3 days of such use, broke camp and ...wow! The cables were super hot and the 50 to 30 cable burning hot!! Just pray I didn't do any damage. Never again... even if it works....
Yep. I melted a dogbone several years ago. Lucky nothing was damaged. So regardless of all the arithmetic calculations, Iíll stick to one AC and just sweat a little more in July in the Southeast.
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Old 09-24-2020, 11:57 AM   #66
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That's why they invented "Sweet Tea" down South anyway...
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Old 09-24-2020, 12:55 PM   #67
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Originally Posted by Jimbo56 View Post
Yep. I melted a dogbone several years ago. Lucky nothing was damaged. So regardless of all the arithmetic calculations, Iíll stick to one AC and just sweat a little more in July in the Southeast.

What do you think happened? You are not providing much information other that it involved 2 A/Cs. I donít know how else to say that all A/Cs are not the same and canít be treated as equals in ďcalculationsĒ.

Regardless, the obvious questions are that if you exceeded 30A, why didnít the breaker trip. And if you remained under 30A, then why did a 30A dogbone melt?

Proper electrical systems have protection so they remain safe even if owner overloads it. I wouldnít blame the math when something else went wrong. Besides, weíd still be in the Dark Ages if not for math and wouldnít be enjoying air conditioning at all.
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Old 09-24-2020, 12:58 PM   #68
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good question, CHANCE, as these are the types of 'stories' that easily lead to misinformation about how electricity 'works' - the owner does not understand that simply running two a/c units, or two of anything, has nothing to do with a 'melted' connector, etc. If a connection has an issue, it's with the wiring and connector, NOT the fact that the power was somehow 'overloaded' or anything - a loose neutral wire is a typical issue that cause overheating and melting within plastic housings, not the use of a/c units.
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Old 09-24-2020, 01:23 PM   #69
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good question, CHANCE, as these are the types of 'stories' that easily lead to misinformation about how electricity 'works' - the owner does not understand that simply running two a/c units, or two of anything, has nothing to do with a 'melted' connector, etc. If a connection has an issue, it's with the wiring and connector, NOT the fact that the power was somehow 'overloaded' or anything - a loose neutral wire is a typical issue that cause overheating and melting within plastic housings, not the use of a/c units.
So do dirty/corroded connections - anything that causes the dogbone connection to have a higher than normal resistance will cause heat at that connection and the heat goes up exponentially as the current goes up.
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Old 09-24-2020, 09:51 PM   #70
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I don't think that there is anyone that has camped a number years that hasnít melted a couple of adapters and dog bones

Not trying to run e ac's necessarily either
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Old 09-25-2020, 04:33 PM   #71
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I was in a 50 amp fifth wheel. One carrier AC. Using a 50 to 30 dogbone. A county park camp ground. Might have been a dirty connection. Maybe a loose wire in the pedestal. I donít know. I didnít try to diagnose it due to check out time. All I do know is that it was hot and gooey feeling when I turned the breaker off and went to pull it out of the plug. This coach is 30. Iíve done everything to make the one unit as efficient as possible. When in 98 degree high humidity with no shade, I can get it to 78. So Iím fine. Just sayin.
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Old 09-25-2020, 04:38 PM   #72
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Originally Posted by TurnerFam View Post
good question, CHANCE, as these are the types of 'stories' that easily lead to misinformation about how electricity 'works' - the owner does not understand that simply running two a/c units, or two of anything, has nothing to do with a 'melted' connector, etc. If a connection has an issue, it's with the wiring and connector, NOT the fact that the power was somehow 'overloaded' or anything - a loose neutral wire is a typical issue that cause overheating and melting within plastic housings, not the use of a/c units.
I was not trying to spread misinformation. Only responding to the guy who had a similar experience. I camp & travel for fun and enjoyment. Period.
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Old 09-25-2020, 06:01 PM   #73
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For what itís worth (and we are all just sharing information in case it helps others in some way) the Forest River Sunseeker line of Class Cs is also offering dual high-efficiency air conditioners with 30A service. Along with Thor and others, itís now fairly common in what appears to be mid-size modest-cost motorhomes. Larger and higher-end gasoline rigs mostly continue to have 50A and 5,500 in lieu of 4,000-Watt generators that come with 30A electrical in these size motorhomes. The smaller generator should save both weight and cost.
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