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View Poll Results: Is it normal for AC and Microwave to trip circuit breaker?
Yes, its just how it is. 43 57.33%
No, the dealer is full of it. 32 42.67%
Voters: 75. You may not vote on this poll

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Old 07-21-2015, 09:48 AM   #1
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Microwave and AC Trip Breaker - Dealer Says Normal?

Hello All!

Working through some painful stuff with picking up my new RV.

On our first trip, we noticed that when we are using the AC and the Microwave a circuit breaker trips. I asked the dealer about this and was told that it was normal and that I couldn't use both of them together.

Is this true? It just doesn't make sense to me.

2016 Sunseeker 3050SF

Thanks all,

Bill
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Old 07-21-2015, 09:50 AM   #2
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What size power cord do you have: 30 or 50 amps? If 30 amps, yes you have to manage your load.

See this thread.

http://www.forestriverforums.com/for...ker-88037.html
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Old 07-21-2015, 09:52 AM   #3
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30 AMP. Ok, so is there a way I can work around this? Should both use the full 30 amps?

Thanks so much,

Bill
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Old 07-21-2015, 09:58 AM   #4
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Not really, you just have to manage what you use at the same time. See post #5 in link above.
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Old 07-21-2015, 09:59 AM   #5
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30 AMP. Ok, so is there a way I can work around this? Should both use the full 30 amps?

Thanks so much,

Bill
http://www.forestriverforums.com/for...aws-17300.html

A/c uses around 12-13 amps
Microwave uses 12 - 13 amps
Converter uses 1 - 8 amps.

If your fridge was on electric 5-8 amps and your hot water heater was on on electric 9 - 13 amps it's not hard to do the math on this one.

Converter is always a constant amp draw regardless of anything else.

Your @ 24 to 26 amps with microwave and a/c Then add let's say 4 amps for converter. [emoji10]


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Old 07-21-2015, 10:11 AM   #6
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I can run ac and microwave at same time on my 2011 3170 30 amp either off of shore power or generator never tripped the breaker. I also only run the water heater on LP.
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Old 07-21-2015, 10:44 AM   #7
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I can run ac and microwave at same time on my 2011 3170 30 amp either off of shore power or generator never tripped the breaker. I also only run the water heater on LP.

I was going to ask him about that. Is the hot water heater on electric or lp? I usually figure on 1 hear type item along with the air conditioner. Coffee maker, hair dryer, hot water heater. Once you have more than one of those items going at the same time you'll more than likely trip your breaker or the campground breaker.
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Old 07-21-2015, 11:29 AM   #8
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Originally Posted by DoctorT68 View Post
Hello All!

Working through some painful stuff with picking up my new RV.

On our first trip, we noticed that when we are using the AC and the Microwave a circuit breaker trips. I asked the dealer about this and was told that it was normal and that I couldn't use both of them together.

Is this true? It just doesn't make sense to me.

2016 Sunseeker 3050SF

Thanks all,

Bill
You should be able to use both together no problem but nothing much else. If the water heater kicks on electric or other large load like a coffee maker or maybe even the refrigerator if you have the large 4 door option it will likely trip. Also if you have the optional larger 15K A/C you may have more issues. Some people have converted over to 50 amp service to resolve the issues.
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Old 07-21-2015, 11:35 AM   #9
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With all this being said, I to can run a/c and microwave @ the same time.

It's possible that the cheap China breaker wfco uses is weak.

Possibly look into a replacement breaker from hardware store.


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Old 07-21-2015, 12:08 PM   #10
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I can run ac and microwave at same time on my 2011 3170 30 amp either off of shore power or generator never tripped the breaker. I also only run the water heater on LP.
X2. I Use my electric water heater, but make sure to switch it off before I fire up the microwave. I also plug my rv in the night before I leave so the batteries are topped off. If not you could be several hours at the campground drawing maximum amperage from your converter to charge your batteries and run your 12 volt accessories.
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Old 07-21-2015, 12:18 PM   #11
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My Flagstaff 8528ikws has a switch that automatically shuts off power to one if you try to use the fireplace and microwave at the same time. I'm not sure if the AC is on that switch too. It doesn't trip a breaker.
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Old 07-21-2015, 12:19 PM   #12
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Originally Posted by TURBS View Post
With all this being said, I to can run a/c and microwave @ the same time.

It's possible that the cheap China breaker wfco uses is weak.

Possibly look into a replacement breaker from hardware store.


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I also was able to use both on my previous rig IF I had full voltage at the campground. Check the pedestal to see how many volts you have. I have been in some places was the voltage was a little low and that created problems for me.
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Old 07-21-2015, 12:21 PM   #13
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The water heater (Suburban 6 12amps)is often overlooked. You have to do some math as far as what you can draw from the power well. Seems like too much figuring when you're on vacation!
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Old 07-21-2015, 12:21 PM   #14
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http://www.forestriverforums.com/for...aws-17300.html

Converter is always a constant amp draw regardless of anything else.


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Not true. Converter AC draw is a function of DC load. Zero DC load will have a very small AC draw by the converter. (I do my own electrical stunts - Electrical Power Engineer and PE).
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Old 07-21-2015, 12:23 PM   #15
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Not true. Converter AC draw is a function of DC load. Zero DC load will have a very small AC draw by the converter. (I do my own electrical stunts - Electrical Power Engineer and PE).
Sorry but true.
the converter must use ac amps to supply DC voltage.


Explain to me how you convert ac voltage to DC voltage without an AC amp draw?
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Old 07-21-2015, 12:26 PM   #16
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Originally Posted by DoctorT68 View Post
Hello All!

Working through some painful stuff with picking up my new RV.

On our first trip, we noticed that when we are using the AC and the Microwave a circuit breaker trips. I asked the dealer about this and was told that it was normal and that I couldn't use both of them together.

Is this true? It just doesn't make sense to me.

2016 Sunseeker 3050SF

Thanks all,

Bill
What is the supply voltage?
The lower the supply voltage the harder the appliance(s) have to work which means higher than normal amp draw.
I was at a campground that had 115 volts no load. My A/C pulls 13.5 amps max when at 120 volts. This particular campground my A/C amps went to 17 (because once I added my A/C load the volts dropped to 112).

Thankfully my Progressive Industries EMS was in-line. At one point the CG voltage dropped to 105, the EMS "opened" helping to protect my appliances.
I could not run my A/C, microwave and WH elect. at the same time like I usually do.

Bobby
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Old 07-21-2015, 12:28 PM   #17
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Use of Microwave and Ac

We have a 2013 Flagstaff Diamond Package IKWS and we have been able to use both but not if the television or any other plug in device is in use. Our breaker for the microwave is on a switch with the fireplace so no heat and micro. We have learned to make the coffee first warm whatever in the micro wave. Toast the toast then put back the ac or heat on . Just a little bit of thinking ahead. We also use water heater on propane and the fridge also.
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Old 07-21-2015, 12:36 PM   #18
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Not true. Converter AC draw is a function of DC load. Zero DC load will have a very small AC draw by the converter. (I do my own electrical stunts - Electrical Power Engineer and PE).
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Old 07-21-2015, 12:37 PM   #19
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I haven't seen this question asked... when you say 'a' breaker trips, are you talking about one of the 15amp branch circuits in the distro panel, the 30 amp main breaker or the one on the pole? I could see the 30 amp in either the converter or at the pole tripping for the many reasons given above but a single 15amp branch circuit should not have 2 high-draw appliances on it... A/C should be a dedicated circuit as should micro (that's the way it is in my 5er). If they are on the same circuit, I would say that is miswiring.
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Old 07-21-2015, 12:40 PM   #20
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We tripped the main 30A breaker once last week while using the microwave & the 15000 AC the Compressor was probably cycling........ Also use a 30A Progressive Industries power protection. Power was reading properly at the pedestal.

We did finally wise up and add a second 30A service for the extra things. Last year we tripped the pedestal and the main 30A trailer breakers often with the AC & Microwave but my fault for trying to run too much. . We also use the water heater on propane as I have for 30 years.
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