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Old 06-18-2015, 02:48 PM   #1
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circuit keeps tripping

This is the first time this has happened after many nights camping. For some reason every time we use the microwave inside it trips the circuit while the air is running. Never had this problem before. We are hooked up to a 30 amp service all readings on our surge protector are fine. We also tripped the circuit at the pole. What is causing this?
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Old 06-18-2015, 02:54 PM   #2
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Several could be's:
1.Your 30a breaker in the camper could be getting weak from being at max current capacity so much.
2. Starting cap in ac could be deteriorating.

3. your pedestal, plug could have a poor connection at the pedestal end.

4' Low voltage in the cg equals higher current = early tripping of breakers than normal.
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Old 06-18-2015, 02:58 PM   #3
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New (slightly larger) microwave?


Hotter outside, more people, more in and outs; Greater load on the A/C)?


Lower voltage?


Remember that a 750W (small) microwave is drawing about 7A, the A/C is around 12A. That's already 1/2 way to maximum. A 1200 watt is microwave is 15A.


Another 5A for the converter to run all the 12V lighting and the control systems for the appliances.


Any other 120V appliances? Toaster (10A) when on. Coffee maker (5A or 10A depending on whether it is brewing or just keeping the coffee hot).


How about the television? another amp or two. The cell phone chargers at 1/2 an amp each.


It all adds up!


Take a objective inventory of all your 110VAC usage. Then you'll see where 30 amps goes.
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Old 06-18-2015, 03:16 PM   #4
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Thank you, I am begging to think it is the campground. This place has been scetchy from the get go.
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Old 06-18-2015, 04:55 PM   #5
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Check your voltage with a meter. If it is at or below 105vac, you are putting your rig at risk. Especially the ac unit.

Could be the cg power feed is under capacity for a full cg in hot weather.
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Old 06-18-2015, 05:25 PM   #6
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Most likely cause is the water heater element is on at the same time.
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Old 06-18-2015, 05:43 PM   #7
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To get amperage draw, divide watts by volts. A 1200 watt toaster at 120 volts draws 10 amps. If voltage drops to 104 volts amperage increases to 11.54 amps. You don't want to use any appliance if your voltage is about 10% different (high or low) from 120 volts. An AC will draw considerably more power while starting up. if you voltage is low and the AC starts , hot water is on the MW could add enough to pop the breaker. Adding in TV ref and other background draws.


You can help the situation by using propane for the water, and using appliances one at a time. Turn AC off while using MW etc. It's a pain but part of camping in older or more remote areas where power supplies may not be as steady as they should be. Good Luck.
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Old 06-18-2015, 05:52 PM   #8
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FYI about the only appliance in your RV that has a significant increase in amps when the voltage drops is the air conditioner. Resistive loads, such as a toaster, do not increase amps as the voltage drops.
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Old 06-18-2015, 06:04 PM   #9
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Everything has to work harder or longer to accomplish the same amount of work when voltage is lower. Toaster's may run longer ( and cooler), fans will run longer, heater elements will put out less heat and run longer. Below 104 volts most EMS devices will cut power at 104 and about 132. Motors will run hotter and longer to produce the same work output...
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Old 06-18-2015, 06:16 PM   #10
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wags999, you are correct on the amount of work done. But now you are comparing unlike quantities. Amps, which is the issue at hand, is an instantaneous quantity. The work you are referring to is amp-hours or watt-hours. Not instantaneous but time related.

Most of the appliances will not be damaged by low voltage (water heater, toaster) but will not work efficiently. The air conditioner can be damaged by low voltage.
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