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Old 08-29-2007, 08:50 PM   #1
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2008 27' International CCD FB
Mill Valley , California
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Microwave oven and Air conditioner

Hey guys another question from this newbie
When I use my microwave while the air conditioner is on it trips the circuit breaker. Is this common or should I have Toscano look at it when I take the AS in for skin replacement. Is something wrong with the wiring? Should they be on separate breakers? It happens everytime the two are on.

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Old 08-29-2007, 09:14 PM   #2
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We had a 1000 watt microwave and had sinilar problems. We replaced it with a small 600 watt unit; it works a lot better.

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Old 08-29-2007, 09:41 PM   #3
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DO you have a electric/gas water heater? I have tripped the 30A breaker (main trailer) when using the micro with the AC on. IF you are tripping the AC or the micro breaker then you may have a problem.
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Old 08-29-2007, 10:22 PM   #4
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Hi, you should be able to use the microwave and air conditioner at the same time. Was it the outside source breaker that kicked or the one in your trailer? A low voltage source could cause this to happen. Or if you have the microwave oven, the air conditioner, and an electric water heater on at the same time; This is too much draw for a 30 amp circuit. Other than that, have each item tested for excessive draw.

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Old 08-30-2007, 05:54 AM   #5
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Windermere , Florida
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We have the same issue. Microwave and AC = tripped breaker. Even with lights and TV off. Rule is turn off the AC to run the Microwave.

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Old 08-30-2007, 07:50 AM   #6
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Grand Island , Nebraska
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With my Limited, I have no choice. The A/C is wired to a switch that redirects the current to the microwave when needed. Impossible to use both at the same time.

'92 Limited 34ft (now sold); '96 Dodge Cummins 4X2, 5speed
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Old 08-30-2007, 08:20 AM   #7
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Mobile , Alabama
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Same goes for my 87 34' Excella. There is a factory installed switch located in a cabinet above the stove. If I want to use the microwave, I flip the switch. It cuts power to the air conditioner and activates the microwave.
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Old 08-30-2007, 10:28 AM   #8
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Sounds like a common issue you just live with. It's the inside breaker that goes off.
Thanks guys
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Old 08-30-2007, 10:49 AM   #9
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I can run my AC and Microwave/Convection at the same time without consequence. I do have the 15K Penguin AC/heat pump model. However if I have the water heater on electric, that combined load has sometimes caused campsite site breakers to trip.

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Old 08-30-2007, 11:44 AM   #10
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Airstream used to install switches..

Our Excella 25 had a wall switch hidden over the stove in a cupboard that switched power from the A/C to the factory installed microwave over the fridge... We converted that space to storage cabinet, and use compact microwave tabletop unit, but general rule is that the breaker won't carry both microwave (600 to 800 Watts) plus the A/C at 23 Amps +/- to get compressor going, as well as load from power converter/charger feeding 12V systems...

In Theory, there's no difference between Theory and Practice, but in Practice, there is usually a difference...
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Old 09-06-2007, 07:07 PM   #11
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Placentia , So. Calif.
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The breaker on the power pedestal blew a few times when running AC and micro, but the breaker in the rig never did. Now I use an outlet adapter and plug in to the 50A outlet on the pedestal. Looks like the current draw is close to the 30A, but not enough to blow the 50 or the breakers inside.

2004 8.1L GMC Yukon XL pulling 2005 Classic 31'
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