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 > dual AC on 30 amps - I think I made it work

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JusBud

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Posted: 05/23/19 08:58pm Link  |  Quote  |  Print  |  Notify Moderator

Good thing you unplugged your curling iron
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valhalla360

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Posted: 05/24/19 03:51am Link  |  Quote  |  Print  |  Notify Moderator

time2roll wrote:

Check your plug at the pedestal for heat.


Probably worth taking a look at the back of the breaker panel and all along the cord.

30amp is only rated for 25amp continuous, so you are really pushing the limits. If everything is in perfect condition and the voltage in the park is good, it can work.

Voltage can play a role here. If you are in a park with high voltage (but within nominal specs), it can work but if voltage drops, it will become a problem. Watts = Volts * Amps...so to maintain the same power (watts), if the voltage drops the amps will go up. If you are lucky, the breaker trips.


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bucky

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Posted: 05/24/19 04:37am Link  |  Quote  |  Print  |  Notify Moderator

I smell smoke. Soon.


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lampooner

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Posted: 05/24/19 05:58am Link  |  Quote  |  Print  |  Notify Moderator

I had a 2001 Fleetwood Flair motorhome with dual AC units. It had a "Gizmo", that's a very technical term! The purpose of ths was to prevent both units from trying to start at the same time. It worked great, n ever had a problem running both AC units,

The Gizmo was built in, came with MH. Maybe someone makes a similar unit as an after-market unit.


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dodge guy

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Posted: 05/24/19 06:01am Link  |  Quote  |  Print  |  Notify Moderator

You can be assured the voltage is too low for safe operation.


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twodownzero

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Posted: 05/24/19 07:14am Link  |  Quote  |  Print  |  Notify Moderator

valhalla360 wrote:

time2roll wrote:

Check your plug at the pedestal for heat.


Probably worth taking a look at the back of the breaker panel and all along the cord.

30amp is only rated for 25amp continuous, so you are really pushing the limits. If everything is in perfect condition and the voltage in the park is good, it can work.

Voltage can play a role here. If you are in a park with high voltage (but within nominal specs), it can work but if voltage drops, it will become a problem. Watts = Volts * Amps...so to maintain the same power (watts), if the voltage drops the amps will go up. If you are lucky, the breaker trips.


Never heard of Ohm's law I take it?

RoyB

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Posted: 05/24/19 08:08am Link  |  Quote  |  Print  |  Notify Moderator

I solved my coffee pot problem of always being 'ON' keeping the coffee hot.. I went with the CUISINART BRAND Grind and Brew Coffee maker. It is only 'ON' for the five minutes or so for grinding the coffee beans and making the coffee then it pours up into a thermos carafe. This keeps my coffee hot all day... Then it shuts completely OFF... We also bring along our favorite taste bottled water just for making coffee. This insures the same good coffee taste every time... I also have a MR COFFEE grinder to grind up the beans if necessary. My truck has a low wattage PSW Power Inverter in it perfect for running the Mr Coffee grinder when needed... This way I can use my ole standby COLEMAN stove top perc to make somewhat the same taste of coffee when off grid running off my batteries... I usually however just plug the Cuisinart Grind and Brew into my 2KW generator for five minutes... That works too...

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Gotta have my coffee first then I can do everything else when camping hehe
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This all fits in great in our tent camping as well...

Roy Ken
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wnjj

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Posted: 05/24/19 08:14am Link  |  Quote  |  Print  |  Notify Moderator

twodownzero wrote:

valhalla360 wrote:

time2roll wrote:

Check your plug at the pedestal for heat.


Probably worth taking a look at the back of the breaker panel and all along the cord.

30amp is only rated for 25amp continuous, so you are really pushing the limits. If everything is in perfect condition and the voltage in the park is good, it can work.

Voltage can play a role here. If you are in a park with high voltage (but within nominal specs), it can work but if voltage drops, it will become a problem. Watts = Volts * Amps...so to maintain the same power (watts), if the voltage drops the amps will go up. If you are lucky, the breaker trips.


Never heard of Ohm's law I take it?

Ohms law has nothing to do with inductive motor loads. The current goes UP when the voltage goes down which is why windings can melt when motors aren’t fed the proper voltage.

myredracer

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Posted: 05/24/19 09:49am Link  |  Quote  |  Print  |  Notify Moderator

Not recommended to run 2 ACs on 30 amps. Some will do it and claim it works just fine, but...

The momentary starting current of AC units is 50-60 amps and that will be on top of an already running AC unit and any other loads. The 80 or so amps can really drag down the voltage and an AC can struggle to start. It causes the motor windings to overheat and will cause damage. You may find you can get 2 ACs to start but the damage is cumulative and you can have an AC unit prematurely fail one day for no apparent reason. AC units are not cheap to replace...

Running AC units on chronically low voltage (at full load) is also not good when it gets down towards 105 volts. Yes, the current draw does go up somewhat too at lower voltage, although I've never been able to find data on RV units. A compressor load remains the same but as voltage goes down, a motor will generate less power and will work harder to keep the compressor going and draw more current. Again, the excessive current will cause damage to AC motors.

It's always a good idea to monitor your voltage in a CG. Newer CGs usually have decent voltage depending on where you are on a run of pedestals and if everyone else isn't running AC units. Older CGs can have high voltage drops and some sites can have long individual runs of smaller gauge wire to them which can worsen voltage drop.

A few folks have connected a 2nd AC to the 20 amp receptacle in a pedestal. But that can also be a voltage drop problem because the electrical code doesn't require wiring to pedestals to be sized for a 30 & 20 amp recept. to be running together at the same time.

If you still decide to run 2 AC units on 30 amps, I'd at least plug into a 50 amp pedestal using an adapter, *if* you can find a 50 amp pedestal (often hard to find one).


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myredracer

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Posted: 05/24/19 09:49am Link  |  Quote  |  Print  |  Notify Moderator

OMG, the double posting issue is getting boring...

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