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Old 01-21-2016, 07:04 AM   #1
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30 amp service

I am visiting the Airstream park in Pensacola. It's very nice, and convenient to my visiting my son who lives in Gulf Shores Alabama.
The very nice camp hosts told us to park at any of the sites since most of them were empty. I found a nice pull through site, leveled, unhitched but when I went to connect to shore power, I found it was a 30 amp site. My FC28 is wired for 50 amps but AS provided a 50 to 30 amp adapter. I didn't want the hassle of hooking up and moving to another site and my understanding was that so long as I didn't run both ACs, 30 amp would work.
Well last night I turned on both heat pumps and I also had an electric heater running and lost power. The shore power was dead, and had no circuit breaker on it. Fortunately, my power cord was long enough to reach a shore power plug in the next empty site and using only one furnace, I was able to get through the night.
So was the problem running both heat pumps? Do both heat pumps also need 50 amps like trying to run both ACs? Or was it the additional load of the space heater?
I'm going to see the camp host this morning and see if they can't reset the breaker somewhere. it's ugly having my power cord snaking around the trailer. Or maybe I should bite the bullet and hook up and move to a 50 amp site.
Thoughts?

Richard
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Old 01-21-2016, 07:18 AM   #2
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A heat pump is basically an air conditioner with the freon cycle running backwards. It has the same power requirements as it does when it's being a normal air conditioner. Sorry, you can't run them both on a 30 amp circuit.
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Old 01-21-2016, 07:33 AM   #3
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You likely cannot run even one Heat pump with an electric space heater and other appliances on too with 30A.
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Old 01-21-2016, 07:35 AM   #4
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You are not going to be able to run an electric heater in addition to the heat pump on 30 amp service. In fact, you might be pushing it to even try the hot water heater on electric. That is why you have propane...run the furnace.

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Old 01-21-2016, 07:40 AM   #5
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You are not going to be able to run an electric heater in addition to the heat pump on 30 amp service. In fact, you might be pushing it to even try the hot water heater on electric. That is why you have propane...run the furnace.

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Live and learn. I just hope I didn't fry the camp's electric outlet.
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Old 01-21-2016, 07:43 AM   #6
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All electrical appliances should have a nameplate on them somewhere that states how many watts are required to run that item. A watt is one volt times one amp. At 120 volts, 30 amps equals 3600 watts. Exceed that, and something's going to blow--hopefully it's the circuit breaker and nothing catches fire.

Suggest you read a few nameplates, especially the heavy stuff like air conditioners, electric heaters, microwaves, and hair dryers, then do the math. You have to budget electricity more so than you do money--there are no lenders available when you use too many watts.
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Old 01-21-2016, 09:32 AM   #7
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One heat pump/AC eats about 18 to 20 amps of your 30 allowance. The space heater maybe 12 or. Add in lights, fridge, and water heater and the circuit is blown.
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Old 01-21-2016, 09:35 AM   #8
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Wow! How cold was it in Pensacola that you needed both heat pumps AND the space heater! Did you remember to close the windows???
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Old 01-21-2016, 10:14 AM   #9
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We have 30 amp service in our Airstream (and one Air conditioner) and it is plenty, when you learn how to manage it.

For heat we bought a small Dyson Hot space heater because it regulates the heat so well, and use the propane furnace to supplement it if too cold. We never use the heat pump, to noisy, hogs too much of the power so few if any other appliances can be used with it, and can provide little heat below forty degrees.

It is also good to have a voltmeter plugged into a 120V electrical outlet. In campgrounds during cold (and hot) weather, other camping units can pull enough power to lower available power. When you hook up to the power you may see a significant voltage drop as you turn your appliances on. If it drops below 112 volts, we shut something off because you're getting near a tripped breaker from too much current draw.
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Old 01-21-2016, 10:36 AM   #10
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Wow! How cold was it in Pensacola that you needed both heat pumps AND the space heater! Did you remember to close the windows???
ROFL ...
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Old 01-21-2016, 10:58 AM   #11
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It's been below freezing here the past few days and my lovely wife cannot tolerate the cold
We didn't really need both heaters
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Old 01-21-2016, 02:55 PM   #12
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A good formula to help calculate your amperage draw....watts devided by voltage = amps.
So a common space heater running at 1500w devided by 120v=12.5 amps draw. We will run two small ceramic heaters at their low setting (750w) without worrying about it.
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Old 01-21-2016, 03:10 PM   #13
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As stated 30 amp will run one heat pump. However, heat pumps are only good down to about 40 degrees F, and then they simply will not warm up to a temperature that you will be comfortable with. We also have 50 AMP and we ran both A/C units most of the summer and time this fall both HP when the temp was 45 degrees in the morning. When temp went below 45 I turned them both off and turned the furnace on. It is much more efficient and warms the trailer up quickly (if it works) our did not for a couple of months, hopefully now fixed under warranty.

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Old 01-21-2016, 03:30 PM   #14
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In a 2016 with the duct heat system, the heat pumps must first warm up the space between the two sheets of aluminum on the roof and continue to heat that space and metal while blowing some warm air into the trailer. Some folks have been disappointed with the heat pump performance. Below 40 outside, they are going to do much.

The furnace is the best factory installed heating device, but if it runs a lot in a 24 hour period, you might have to refill a 30 pound propane tank every other day.
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