Journey with Confidence RV GPS App RV Trip Planner RV LIFE Campground Reviews RV Maintenance Take a Speed Test Free 7 Day Trial ×
 


Reply
 
Thread Tools Search this Thread Display Modes
 
Old 06-02-2024, 11:02 AM   #1
New Member
 
2023 23' Flying Cloud
Pipe Creek , Texas
Join Date: Jan 2013
Posts: 4
Question about running AC and Microwave

Not sure if I am posting on the right forum group
A couple of days ago We just bought a Brand New Flying Cloud 23 ft, We need some input on whether
Will we need to turn off the AC when we run appliances such as the Convection Microwave or Keurig Coffee machine to prevent overloading the Electric or can we run things together
Halfstar is offline   Reply With Quote
Old 06-02-2024, 12:30 PM   #2
3 Rivet Member
 
Glen Carter's Avatar
 
2018 19' Tommy Bahama
Downey , CA
Join Date: Feb 2020
Posts: 175
Depends on your shore power... there are a number of factors:
1- Amps input, shore power or generator
2- the 12V converter takes a lot of power
3- the A/C without soft start draws a lot of power

If you plan to run a 2,000W generator, turn off the circuit breaker for the converter.
Generally, you cannot run the microwave and converter on a 2,000W generator. With a soft start on the A/C, you can run the A/C, without the converter.

If you are running the A/C and want to use the microwave, maybe turn up the temp or turn A/C to fan only while using the microwave.

It's best to do a power audit and determine the max Watts of each item on the circuits, the converter, A/C (start and run), microwave, refrigerator, coffee maker, laptop and phone chargers.... Then you can determine what you can safely run based upon your shore power, 15A, 20A or 30A .... If you have the 50A, you should be good to run everything.
Glen Carter is offline   Reply With Quote
Old 06-02-2024, 12:36 PM   #3
Keys Dave
 
2021 25' Flying Cloud
Big Torch Key , FL
Join Date: Aug 2023
Posts: 78
Blog Entries: 1
The answer is a little bit more complicated than it might seem.
First, what is the power source? 30 amp plug at home or at camp ground? Generator? Or inverter? Next what A/C are you using probably a 15k Btu. That'll pull about 20 amps depending on the model and the voltage. Finally what else are you running, is the converter charger working to recharge the battery? It all comes into the equation. Your total load must be less than 30 amps If you're on a single 30 amp cable and you can't pull the full 30 indefinitely or things will over heat.
Keys Dave is offline   Reply With Quote
Old 06-02-2024, 05:08 PM   #4
Rivet Master
 
1988 25' Excella
1987 32' Excella
Knoxville , Tennessee
Join Date: Oct 2010
Posts: 5,166
Blog Entries: 1
If you have or purchase a surge protector/EMS for the trailer it will tell you how many amps you are drawing at any time and you can use it to check the draw of each of your appliances.

You have to stay under 30 amps and under the individual breaker for each circuit. You can probably get away with most things running them 2 at the time when on shore power. Do you have an electric fridge? Electric water heater? Lithium batteries? Use a electric space heater? Micro Air Easy Start? Our AC draws about 16 amps when running in moderate weather, Our power converter draws about 6 amps a lot of the time when I check it. Our older trailer is wired so that it will run either the AC or the microwave but not both at the same time.
Bill M. is offline   Reply With Quote
Old 06-02-2024, 09:21 PM   #5
Rivet Master
 
Piggy Bank's Avatar
 
2019 27' Flying Cloud
Kansas City , Missouri
Join Date: Apr 2014
Posts: 2,019
In my experience with a previous 30 amp airstream, you will likely need to turn off the AC during the microwave, and if using a hair dryer. Not sure about a Keurig.
__________________

Piggy Bank
Piggy Bank is offline   Reply With Quote
Old 06-03-2024, 07:28 AM   #6
Rivet Master
 
waninae39's Avatar
 
2022 25' Flying Cloud
NCR , Ontario
Join Date: Feb 2017
Posts: 3,229
we use a victron multiplus 3k
we can run ac , uwave , toaster and hair drier at the same time
__________________
2023 25' FB FC, hatch, Queen,30A,1AC,Awning pkg, Convection uwave.Multiplus 12/3000-50,700A Lion,MPPT 100/30,Orion-TR 30,Cerbo GX,GX touch 50,Lynx distributor,dual BMV-712, smart shunt 500A&1000A, RUUVI temp/humidity sensors,2 Mopeka LP sensors
NCR,Ontario,VE3HIU since 1978
WBCCI# 21212
waninae39 is offline   Reply With Quote
Old 06-03-2024, 10:22 AM   #7
3 Rivet Member
 
nswhite's Avatar
 
2022 30' Flying Cloud
Phoenix , Arizona
Join Date: Jun 2006
Posts: 212
You could also try running it until a circuit breaker pops. On my 30 amp the bad combo was AC, microwave, electric hot water heater kicking in.


Make sure you know where the circuit breaker box is before testing.
nswhite is offline   Reply With Quote
Old 06-03-2024, 01:21 PM   #8
Site Team
 
richard5933's Avatar

 
1994 25' Excella
Waukesha , Wisconsin
Join Date: Sep 2020
Posts: 5,898
Images: 5
When plugged into a 30-amp outlet, we can run the a/c and microwave together but nothing else with a substantial draw. Those items can include the converter/charger, hair dryer, coffee maker, toaster, etc.

We have a Micro-Air soft start installed on the a/c, so that makes it play better with other appliances. Your mileage may vary if you don't have the soft start installed. You'll know when you trip the breaker.
__________________
Richard
11018
1994 Excella 25 'Gertie' Follow the build on Gertie!
1999 Suburban LS 2500 w/7.4L V8 'Bert'
1974 GMC 4108a - Custom Coach Land Cruiser 'The Bus' (Sold)
richard5933 is offline   Reply With Quote
Old 06-03-2024, 04:02 PM   #9
3 Rivet Member
 
2014 25' FB Flying Cloud
Fitchburg , Wisconsin
Join Date: Jul 2014
Posts: 232
I think the limiting device is the 30-amp breaker in your converter/charger, although i encountered two faulty pedestals during a recent trip to Texas. As has been mentioned you can try various appliance combinations to find what works--the breaker will not be damages if it flips.

Some Southwire-brand surge protectors can be used with an optional Bluetooth-connected display that shows current draw without going outside to the pedestal. I find it very useful.

If you do find a faulty pedestal (probably a faulty 30-amp breaker) you can, with an adaptor, plug into the 50-amp outlet. You will still be limited by your 30-amp breaker, but it will work.
BillfromWI is offline   Reply With Quote
Old 06-03-2024, 08:01 PM   #10
1 Rivet Member
 
2022 23' Flying Cloud
Mobile , Alabama
Join Date: Aug 2022
Posts: 9
No issue running ac and microwave in my FC23 while on shore power.
Duckear is offline   Reply With Quote
Old 06-03-2024, 08:26 PM   #11
Site Team
 
richard5933's Avatar

 
1994 25' Excella
Waukesha , Wisconsin
Join Date: Sep 2020
Posts: 5,898
Images: 5
Quote:
Originally Posted by BillfromWI View Post
I think the limiting device is the 30-amp breaker in your converter/charger, although i encountered two faulty pedestals during a recent trip to Texas. As has been mentioned you can try various appliance combinations to find what works--the breaker will not be damages if it flips.

Some Southwire-brand surge protectors can be used with an optional Bluetooth-connected display that shows current draw without going outside to the pedestal. I find it very useful.

If you do find a faulty pedestal (probably a faulty 30-amp breaker) you can, with an adaptor, plug into the 50-amp outlet. You will still be limited by your 30-amp breaker, but it will work.
Couple of things...

We're talking here about 120vac service, not the 12vdc provided by the converter/charger. I suspect you have your breakers confused as the 30-amp breaker in the main 120vac service panel is the master for your trailer, not the one supplying power to the converter/charger. Or perhaps you've got your 120vac breaker panel confused with the converter/charger. Either way, something about this is confused so people shouldn't get the wrong idea that the converter/charger protects anything on the 120vac side of things.

There is are risks to plugging into a 50-amp pedestal outlet with an adapter - they're not great immediate risks but risks nonetheless. First, if you plug your 30-amp rated cable into the 50-amp outlet your shore power cord will not be protected adequately. The purpose of breakers is to protect wiring, and the wires in your shore power cord are only rated at 30-amps and by plugging into the 50-amp outlet there is a potential of sending 50-amps over them. Should something fail in your trailer (like the 30-amp main) that cord could become one long heating element.
__________________
Richard
11018
1994 Excella 25 'Gertie' Follow the build on Gertie!
1999 Suburban LS 2500 w/7.4L V8 'Bert'
1974 GMC 4108a - Custom Coach Land Cruiser 'The Bus' (Sold)
richard5933 is offline   Reply With Quote
Old 06-04-2024, 09:09 PM   #12
3 Rivet Member
 
2014 25' FB Flying Cloud
Fitchburg , Wisconsin
Join Date: Jul 2014
Posts: 232
All of my AC breakers are mounted on what I think of as the converter/charger chassis. I guess I should have called it "converter/charger/AC distribution panel".

Thanks for your comments about adaptors. They are always my last choice.
BillfromWI is offline   Reply With Quote
Old 06-04-2024, 09:23 PM   #13
Rivet Master
 
2018 28' International
Fayetteville , Georgia
Join Date: Jan 2018
Posts: 837
Is your AS a 30 amp or a 50 amp (dual AC)?
If a 30, generally you are limited to running the AC and one additional high load item at a time. You only have 30 amp capacity to play with, so it is easy to exceed 30 amps. By comparison, a 50 amp has two separate 50 amp legs. Each AC will be on a 50 amp breaker. Lots of additional capacity to run the microwave, hairdryer, etc
Good advice to get an EMS that shows your draw.
.
brick1 is offline   Reply With Quote
Old 06-05-2024, 08:08 AM   #14
Site Team
 
richard5933's Avatar

 
1994 25' Excella
Waukesha , Wisconsin
Join Date: Sep 2020
Posts: 5,898
Images: 5
I think that Oliver explains it best...



It's all about the theory of 7, or in this case 30.
__________________
Richard
11018
1994 Excella 25 'Gertie' Follow the build on Gertie!
1999 Suburban LS 2500 w/7.4L V8 'Bert'
1974 GMC 4108a - Custom Coach Land Cruiser 'The Bus' (Sold)
richard5933 is offline   Reply With Quote
Old 06-05-2024, 11:12 AM   #15
New Member
 
2023 23' Flying Cloud
Pipe Creek , Texas
Join Date: Jan 2013
Posts: 4
Thanks everyone I think I have grasp on it, so much to learn: :
Halfstar is offline   Reply With Quote
Old 06-05-2024, 01:48 PM   #16
Rivet Master
 
2018 28' International
Fayetteville , Georgia
Join Date: Jan 2018
Posts: 837
Quote:
Originally Posted by richard5933 View Post
Couple of things...

We're talking here about 120vac service, not the 12vdc provided by the converter/charger. I suspect you have your breakers confused as the 30-amp breaker in the main 120vac service panel is the master for your trailer, not the one supplying power to the converter/charger. Or perhaps you've got your 120vac breaker panel confused with the converter/charger. Either way, something about this is confused so people shouldn't get the wrong idea that the converter/charger protects anything on the 120vac side of things.

There is are risks to plugging into a 50-amp pedestal outlet with an adapter - they're not great immediate risks but risks nonetheless. First, if you plug your 30-amp rated cable into the 50-amp outlet your shore power cord will not be protected adequately. The purpose of breakers is to protect wiring, and the wires in your shore power cord are only rated at 30-amps and by plugging into the 50-amp outlet there is a potential of sending 50-amps over them. Should something fail in your trailer (like the 30-amp main) that cord could become one long heating element.
Your 30 amp RV will not pull 50 amps from the breaker. The circuit breaker in the RB will protect the power cord. A pedestal cannot “send” 50 amps.
brick1 is offline   Reply With Quote
Old 06-05-2024, 09:44 PM   #17
Site Team
 
richard5933's Avatar

 
1994 25' Excella
Waukesha , Wisconsin
Join Date: Sep 2020
Posts: 5,898
Images: 5
Quote:
Originally Posted by brick1 View Post
Your 30 amp RV will not pull 50 amps from the breaker. The circuit breaker in the RB will protect the power cord. A pedestal cannot “send” 50 amps.
Not necessarily true - there is not an appropriate breaker protecting anything between a 50a pedestal and a 30a trailer. Once the wiring reaches the breaker panel in the trailer you're correct - the main breaker there should protect things if more than 30 amps is drawn.

But, plugging in a 30-amp shore power cord and all the associated attachments to a 50-amp pedestal through an adapter leaves the cord and all those attachments unprotected as they are before the main breaker in the trailer. They're rated at 30a, not the 50a that now has the potential to be pulled over them.

Should there be a short along the way or other serious problem between the pedestal and the 30a main in the trailer's breaker panel things can heat up quickly before the 50a breaker serving the pedestal trips.

Breakers are supposed to be sized to protect the wiring, and in the case the wiring between the 50a pedestal and the 30a main breaker is undersized for the potential current flow should there be a problem. You want the breaker to trip first, not the wiring.
__________________
Richard
11018
1994 Excella 25 'Gertie' Follow the build on Gertie!
1999 Suburban LS 2500 w/7.4L V8 'Bert'
1974 GMC 4108a - Custom Coach Land Cruiser 'The Bus' (Sold)
richard5933 is offline   Reply With Quote
Old 06-06-2024, 07:32 AM   #18
Rivet Master
 
Mollysdad's Avatar

 
2017 26' Flying Cloud
Tampa , Florida
Join Date: Feb 2017
Posts: 7,793
Blog Entries: 1
This is the forum where tow vehicles must be big and generators must be small.
Mollysdad is offline   Reply With Quote
Old 06-06-2024, 10:11 AM   #19
Rivet Master
 
1988 32' Excella
Robbinsville , New Jersey
Join Date: May 2012
Posts: 3,353
Quote:
Originally Posted by richard5933 View Post
Not necessarily true - there is not an appropriate breaker protecting anything between a 50a pedestal and a 30a trailer. Once the wiring reaches the breaker panel in the trailer you're correct - the main breaker there should protect things if more than 30 amps is drawn.

But, plugging in a 30-amp shore power cord and all the associated attachments to a 50-amp pedestal through an adapter leaves the cord and all those attachments unprotected as they are before the main breaker in the trailer. They're rated at 30a, not the 50a that now has the potential to be pulled over them.

Should there be a short along the way or other serious problem between the pedestal and the 30a main in the trailer's breaker panel things can heat up quickly before the 50a breaker serving the pedestal trips.

Breakers are supposed to be sized to protect the wiring, and in the case the wiring between the 50a pedestal and the 30a main breaker is undersized for the potential current flow should there be a problem. You want the breaker to trip first, not the wiring.
Despite this, in this country 99% of homes have 1 or more cords rated for 12 amps or less plugged into 15 amp circuits. Just look at all those cheap 16 gauge extension cords out there. Guess there must be 25% of the homes burning down each year.
Wazbro is online now   Reply With Quote
Old 06-06-2024, 12:42 PM   #20
Site Team
 
richard5933's Avatar

 
1994 25' Excella
Waukesha , Wisconsin
Join Date: Sep 2020
Posts: 5,898
Images: 5
Quote:
Originally Posted by Wazbro View Post
Despite this, in this country 99% of homes have 1 or more cords rated for 12 amps or less plugged into 15 amp circuits. Just look at all those cheap 16 gauge extension cords out there. Guess there must be 25% of the homes burning down each year.
You're correct - the odds are that things will be okay which is why I said that it's not a great risk. But it is a risk, and they'll only be okay until they're not.

In my experience there are far more failures and problems with electric cords, adapters, and devices used with an RV than in a home for a multitude of reasons.

Everyone chooses their own level of risk tolerance, and I was just pointing out that this option for powering an Airstream carries a risk.
__________________
Richard
11018
1994 Excella 25 'Gertie' Follow the build on Gertie!
1999 Suburban LS 2500 w/7.4L V8 'Bert'
1974 GMC 4108a - Custom Coach Land Cruiser 'The Bus' (Sold)
richard5933 is offline   Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Microwave compared to a convection microwave. Happycampers Airstream Motorhome Forums 9 05-04-2023 08:36 AM
Fridge running on LP when on Auto setting and running on Gen. Pepperpod Refrigerators 12 11-09-2020 04:58 PM
Running AC while using convection microwave FishByFly 2016 - Current Flying Cloud 5 08-03-2016 10:07 AM
Running Microwave off generators Ponyfvr Boondocking 16 06-27-2015 12:57 PM
Anybody replace their microwave to convection microwave in a 16 sport scamp 2005 and newer - Bambi all models 0 07-10-2014 04:34 AM


Featured Campgrounds

Reviews provided by

Disclaimer:

This website is not affiliated with or endorsed by the Airstream, Inc. or any of its affiliates. Airstream is a registered trademark of Airstream Inc. All rights reserved. Airstream trademark used under license to Social Knowledge LLC.



All times are GMT -6. The time now is 12:39 PM.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, Jelsoft Enterprises Ltd.