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06-18-2015, 01:48 PM
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#1
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Senior Member
Join Date: Jun 2014
Location: sterling heights
Posts: 145
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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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2014 white hawk 33bhbs
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06-18-2015, 01:54 PM
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#2
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Site Team
Join Date: Jan 2011
Location: James Island, SC
Posts: 22,767
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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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06-18-2015, 01:58 PM
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#3
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Senior Member
Join Date: May 2015
Location: Campbell Hall
Posts: 2,835
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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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06-18-2015, 02:16 PM
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#4
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Senior Member
Join Date: Jun 2014
Location: sterling heights
Posts: 145
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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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06-18-2015, 03:55 PM
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#5
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Site Team
Join Date: Jan 2011
Location: James Island, SC
Posts: 22,767
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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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06-18-2015, 04:25 PM
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#6
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Senior Member
Join Date: Jun 2012
Location: Sparta, TN
Posts: 1,174
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Most likely cause is the water heater element is on at the same time.
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06-18-2015, 04:43 PM
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#7
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Senior Member
Join Date: Jan 2015
Location: Surprise
Posts: 2,623
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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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2015 27RLS
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06-18-2015, 04:52 PM
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#8
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Senior Member
Join Date: Jun 2012
Location: Sparta, TN
Posts: 1,174
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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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Chuck - Sparta, TN
2012 Jay Flight 22FB, 2 x Honda EU2000i
2013 GMC Yukon XL Denali AWD
EDUCATION is what you get when you read the fine print.....
EXPERIENCE is what you get when you don't.
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06-18-2015, 05:04 PM
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#9
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Senior Member
Join Date: Jan 2015
Location: Surprise
Posts: 2,623
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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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2011 Toyota Tundra double cab
2015 27RLS
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06-18-2015, 05:16 PM
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#10
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Senior Member
Join Date: Jun 2012
Location: Sparta, TN
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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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Chuck - Sparta, TN
2012 Jay Flight 22FB, 2 x Honda EU2000i
2013 GMC Yukon XL Denali AWD
EDUCATION is what you get when you read the fine print.....
EXPERIENCE is what you get when you don't.
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06-18-2015, 06:25 PM
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#11
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Senior Member
Join Date: Aug 2012
Location: Kalamazoo
Posts: 769
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Quote:
Originally Posted by tnchuck100
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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I started typing this same reply an realized you just did.
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06-19-2015, 09:02 AM
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#12
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Senior Member
Join Date: May 2015
Location: Chicago
Posts: 269
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I just installed and EMS in my unit. If campground voltage drops to 113, TV, dish receiver, Microwave and 15k AC are pulling 40 amps, not sure if hot water heater was also cycling at the time.
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06-19-2015, 09:32 AM
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#13
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Senior Member
Join Date: Apr 2014
Location: pottsgrove
Posts: 194
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We've had this same thing happen on occassion so I would believe a lot has to do with the integrity of the campground power.
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06-19-2015, 09:43 AM
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#14
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Senior Member
Join Date: Jan 2015
Location: Surprise
Posts: 2,623
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Even converters can be effected by low voltage. If voltage is 10% lower your converter will output 10% less power to your battery. Anything with a motor can also be effected. Some motors need a certain amount of power to start, if the power is not there it will continue in it's starting mode and could burn itself out.
Yes your right on the toaster etc, but, it will use more power to do the same amount of work, ie running longer to heat your water, which will make it more likely multiple systems will be running at the same time. Low voltage will effect every system in your rig, some in harmful ways, others in adding to the total load on the system.
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2011 Toyota Tundra double cab
2015 27RLS
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06-19-2015, 09:49 AM
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#15
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Site Team
Join Date: Jan 2011
Location: James Island, SC
Posts: 22,767
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Another harmful effect of low voltage is can shorten the useful life of many appliances. A fan motor for instance will run hotter and it may not go bad but the excessive heat will eventually damage the internal parts of the motor and shorten it's life.
Same with any plug in connectors, heat is their enemy.
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Moderator
2011- 351RLTS Eagle, MorRyde suspension/pin box,
2017- F350 6.7 PSD Lariat FX4,SRW, SB,CC
Hughes PWD SP-50A, TST TPMS
Gator roll-up bed cover
B&W Turnover ball, Companion Std hitch
Can't find what you're looking on JOF? Try Jayco Owners Forum Custom Google Search
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06-30-2015, 09:01 AM
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#16
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Junior Member
Join Date: Jun 2014
Location: North York
Posts: 2
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There are some factors you can check but first check the campground power supply. It may be fluctuating or delivers low voltage especially when a lot of RVs connected to the same supply. You may also want to check your wiring insulations; before a line trips the wires get hot and heat deteriorates the insulation or the wire.
Regards,
L. Mercimek
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