Good Sam Club Open Roads Forum: Tech Issues: A/C on 116 volts?
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 > A/C on 116 volts?

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myredracer

Langley B.C.

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Joined: 04/27/2013

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Posted: 08/09/19 11:26am Link  |  Quote  |  Print  |  Notify Moderator

solismaris wrote:

I've run it occasionally with voltage reading as low as 100. Not recommended I know. But no problems yet. Crossing fingers.
Low voltage damages the windings on AC motors due to overheating the insulation. The damage is cumulative over time and an AC unit can suddenly fail one day for no obvious reason.

Also, when an AC unit starts up, it draws a momentary inrush current of around 50-60 amps. Even if you're at a borderline of 104 volts when running and you think you're okay, the voltage can dip very low and still damage the motors. The voltage dips so fast you can't tell how much on a voltmeter.

Replacing AC units is an expensive affair and not worth gambling IMO.

I installed a flush-mounted mini LED panel meter on the wall near the door. I got a quality US-made Datel meter but any of the inexpensive ones out there should be just fine. Available in a plug-in version too. And 'cos it's a hobby and time & money is no object, I also installed one of their ammeters right above the voltmeter. Current rarely goes much above 15-20 amps and it's the voltmeter that is by far most useful.

If you had a hard-wired EMS with remote display inside, you could also read volts & amps that way but I find the constant scrolling of the data to be annoying.

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RJsfishin

Winston Or.

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Posted: 08/09/19 04:03pm Link  |  Quote  |  Print  |  Notify Moderator

When in doubt, listen to the compressor startup, if its a good positive startup, you good to go. If the compressor start up is sluggish, you playing w/ possibledamage, no matter the volt meter. Its always been that way.


Rich

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LarryJM

NoVa

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Posted: 08/09/19 05:00pm Link  |  Quote  |  Print  |  Notify Moderator

Lynnmor wrote:

RoyB wrote:

I have one of these RV120VAC VOLTMETER (AMAZON) installed in one of my AC receptacles to alow me to watch the AC VOLTAGE all the time... This has the GREEN SCALE on it for easy viewing...



That green scale is off quite a bit since anything above 105 volts is acceptable. I suggest buying a digital voltmeter.


YEP IMO that meter is fairly worthless, but if it makes you feel good go for it[emoticon]

Larry


2001 standard box 7.3L E-350 PSD Van with 4.10 rear and 2007 Holiday Rambler Aluma-Lite 8306S Been RV'ing since 1974.
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profdant139

Southern California

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Posted: 08/09/19 07:16pm Link  |  Quote  |  Print  |  Notify Moderator

LadyRVer, that was a clever tip about taking the fridge off-line if the voltage gets a little low. Thanks for posting that!


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