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Old 08-14-2014, 09:27 AM   #1
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Running AC and microwave together throws the breakers

My RV has the 15k BTU AC unit and we have noticed that when we have the AC on (high or low fan with compressor) and run the microwave (on default high) either the RV's main breaker is thrown or the breaker on the pedestal (30A or 50A) is thrown. The Surge Guard typically has no issues with the power at the pedestal when this happens. At the time there would be no TV, maybe 3 LED lights and the fridge would be on (in AC mode). LEDs on the CO detector and a couple of LEDs on surge protected outlets would be on.

Running AC and anything else is not a problem.

Does anyone else have this issue with their Flagstaff?
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Old 08-14-2014, 09:36 AM   #2
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This is normal in a 30 amp camper.

You are using too much power expecting 30 amps to handle the AC startup amps and the microwave at the same time.

Turn the AC to "FAN ONLY" when you need to use the microwave and back to AC "Cooling" when you are finished.

Startup amps on the compressor and fan motor can exceed 25 amps all by its lonesome and your microwave can use 8-13 amps depending on power setting and wattage. Your converter can be using an additional 5-15 amps depending on active DC load and battery charge status.

You can see you can quickly overwhelm a 30 amp camper's service.
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Old 08-14-2014, 09:49 AM   #3
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normal appliance amp draws

This should help.

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Old 08-14-2014, 10:20 AM   #4
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Lou and Turbs - many thanks. I though that this was the case of course, but I guess I just needed some reassurance. My wife will be especially thankful.
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Old 08-14-2014, 10:36 AM   #5
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Happy camping !

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Old 08-15-2014, 11:57 AM   #6
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Same trailer and same problem. It doesn't always trip with the AC/micro combo, but pretty often. I try to remember to turn off the AC before I run the micro.

I have also tripped it by running two electric griddles at once with the AC on. My wife's hair straightener has tripped it when other things were running.

I guess such is life until we move up to a 50 amp rig.
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Old 08-16-2014, 08:42 AM   #7
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When any electrical motor starts...it uses an "extra set of windings," these are the start-up windings and draw extra power for up to 5 to 6 seconds till the regular motor windings can function without assistance. A microwave can draw up to 12-14 amps by itself. The best solution for you is to place a small note on your microwave, saying "AC ON???" This will remind you to power down the AC of a minute.
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Old 08-16-2014, 09:09 AM   #8
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Are you running the water heater on electric as well ??? It draws a lot of AMPS also............


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Old 08-16-2014, 10:13 AM   #9
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Quote:
Originally Posted by Oaklevel View Post
Are you running the water heater on electric as well ??? It draws a lot of AMPS also............


Assuming the question is to me ... Yes although the heater should not have been on at the time the breakers were thrown. I suspect that it is as others have suggested - the combination of the AC compressor load and the microwave on high that just went over the 30A threshold.

Since that time we have had the lights on, the TV on, ran a Ninja blender and had other "normal" electrical loads and there was no problem. Microwave and AC are the only two that would cause this to happen.
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Old 08-16-2014, 10:50 AM   #10
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Switch the water heater to LP and I'm sure your problem will disappear.
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