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Old 08-02-2014, 09:01 AM   #1
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Minimum Voltage for AC

I have hooked up my new 13.5 Dometic AC unit via a 20 amp outlet in my well house. The voltage at the outlet is 117 V and the voltage in the trailer at the AC breaker is 111 V when running.

Given this voltage drop, is this power supply adequate to keep the AC from burning up?


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Old 08-02-2014, 09:05 AM   #2
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You should be fine down to 110V which I believe is the min spec for standard house power. 120V is usually the unloaded voltage.

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Old 08-02-2014, 09:12 AM   #3
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Thanks Perry, need to continue working on the trailer and it would be nice to have the AC running.


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Old 08-02-2014, 10:38 AM   #4
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David:

Don't know where you are keeping the trailer in Helotes, but I've been working in the Eagle Ford since January and now have the '78 parked where there is NO shade.

The interior temp with one 13.5 K BTU AC running is anywhere from 78 degrees to 96 degrees, depending on how many clouds are passing over.

The point is, one AC is not adequate for proper cooling south of I-10.
I kick the rear 13.5 Dometic on when I get back from the field, and it takes anywhere between 1 and 3 hours to get the interior down to 72 degrees.

Having said that, just a little bit of shade improves the interior temp tremendously.

Do you have a completion target for the trailer?
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Old 08-02-2014, 11:39 AM   #5
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It's probably enough to keep the AC on line, but something is going to be getting hot - maybe too hot. You're dropping 6 volts at (I'm guessing here) 15 actual running amps.

That means that you are generating 90 watts of heat somewhere in your trailer circuitry - and it's most likely at a connection.

If I may, I'll encourage you to unplug the trailer (did I mention to unplug the trailer?) and then hoss on all the connections in the breaker box with a big screwdriver.

I'll be at least one of them is loose.
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Old 08-02-2014, 11:56 AM   #6
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I don't think that is a huge amount of drop. These things take a lot of current.

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Old 08-02-2014, 11:58 AM   #7
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What you are experiencing is a normal current drop. Seventy two? I keep my house at eighty and I live in Fl. Why so low? Use a fan with your AC. Jim
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Old 08-02-2014, 01:52 PM   #8
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Quote:
Originally Posted by 87MH View Post
David:

Don't know where you are keeping the trailer in Helotes, but I've been working in the Eagle Ford since January and now have the '78 parked where there is NO shade.

The interior temp with one 13.5 K BTU AC running is anywhere from 78 degrees to 96 degrees, depending on how many clouds are passing

The point is, one AC is not adequate for proper cooling south of I-10.
I kick the rear 13.5 Dometic on when I get back from the field, and it takes anywhere between 1 and 3 hours to get the interior down to 72 degrees.

Having said that, just a little bit of shade improves the interior temp tremendously.

Do you have a completion target for the trailer?

Dennis,
We are trying to attend the Blanco Rally with this trailer, the interior of the trailer is comfortable and it is parked in the sun, must be all that insulation work that took so long.
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