Originally Posted by Whatdidigetmyselfinto
Found out this weekend that the AC and the microwave are in the same curcuit. AC runs swell all weekend but when I tried to heat up a little b'fast this am......... Click. Both go off, nothing else did. I find that strange to say the least.
Assuming you have a 30 amp RV (3 prong cord)
When you say "nothing else did", what are the other elses?
The reason I am phrasing the question like that, is even if you tripped the MAIN 120 volt AC breaker, the 12 volt DC things will continue to run, but now just off of the battery......which may give the illusion that just the microwave and air-conditioner went off....when in actuality you lost ALL 120 volt power.
If the television or anything plugged into the 120 volt electrical outlets continued to run, then your statement is totally accurate.
However, if the lights, fans, fridge on automatic setting, propane detectors, etc are the other things......then these are all 12 volt DC, and stayed on due to your battery.
Usually the air-conditioner and microwave on are different branch circuits inside the RV, but both contribute to the MAIN breaker (30 amps capacity), either inside the RV or outside on the shore power.
Which specific breaker actually tripped?
More good reading below:
EDIT: One more common thing is a lot of people like to run their water heaters electric heating element, instead of using propane. When the element is heating, it draws 12 amps, out of the 30 total amps available....and also contribute to tripping the main breaker if the microwave or air-conditioner are on at the same time to push the total amps used over 30. A lot of people forget that they have the electric element on.