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Steve F.
Steve F., RVIA Certification
Category: RV
Satisfied Customers: 443
Experience:  Journeyman and Master RV technician, Mechanical & Aerospace Engineer. RVIA Technical Consultant
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the power in my camper trailer when plugged in surges. The

Resolved Question:

the power in my camper trailer when plugged in surges. The only way to stop this from happening is to turn on all of the lights in the camper on and then it seems to be okay.
Submitted: 3 years ago.
Category: RV
Expert:  Steve F. replied 3 years ago.

Hi,

 

Just so I understand your problem, are you saying that when you are plugged into shore power, you get surges on your 120V AC outlets unless you turn on all your 12V lights. Is this correct?

 

Also, when you say that you have tried different electrical outlets, do you mean that you have tried plugging your trailer into different shore power sources, or that you have tried different outlets in your trailer.

Customer: replied 3 years ago.

the way i found the problem was that i was trying to run the heater at night and the blower on the heater would run fast then slow back and forth quickly. When i turned on all the 12 volt lights in the camper it seemed to help.

 

yes i have tried different power sources to connect the camper to.

Expert:  Steve F. replied 3 years ago.

Okay, the first thing you should do is locate your breaker panel and turn off the breaker for the converter. Hopefully it is labeled. Let me know if you need assistance locating the breaker panel.

What other 120V appliances and/or 12V devices do you have turned on at the time?

 

Also, even though you have tried plugging the trailer into different outlets, make sure some of them are actually on different circuits, as we need to rule out a surge originating from the source.

 

 

Customer: replied 3 years ago.

i have located the breaker for the converter and i don't think i have any other devices turned on when the problem happens.

 

i have had the trailer plugged at my house and at my deer lease and it does the same thing.

Expert:  Steve F. replied 3 years ago.

Okay,

 

Turn off all the breakers except the main one (the first one - 30A), then turn each of the others on individually until you find the outlet that has your heater plugged in. Make sure your 12V lights are off. This should result in 2 breakers being turned on, the main and the branch circuit that has the heater plugged in.

See if you still get a surge.

 

Do you have a battery connected to the unit?

Customer: replied 3 years ago.

I still get the surge and yes i have a battery connected to the unit.

Expert:  Steve F. replied 3 years ago.

Have you tried any appliances other than the heater?

Customer: replied 3 years ago.

the vent fan over the stove surges and until i get enough lights turned on the surge happens. Up and down up and down up and down...over and over.

Expert:  Steve F. replied 3 years ago.

The vent fan over the stove is 12V. I am assuming that the vent fan does not surge if you unplug the shore power?

Customer: replied 3 years ago.

i have a lamp plugged in and turned on and when the surge happens it does not surge.

 

that lamp is a 110 lamp.

Expert:  Steve F. replied 3 years ago.

Is the electric heater you were using 12V or 120V? Does this heater have a blower (motor), or is it a convection heater only?

 

If the heater is 120V, have you tried it in the same outlet as the lamp is plugged into?

 

Does your trailer have an inverter (as opposed to a converter)?

 

If we can rule out bad power, then lets make sure you test the heater in the other outlet, as it COULD be a GFCI issue. It may also be that your trailer is wired backwards (neutral to hot, hot to neutral). It could also be a bad converter transformer module, or a bad inverter, if you have one.

 

Does your cooktop vent fan surge when the shore power is disconnected? If it does, it is not the converter/inverter, or bad shore cord phasing.

Customer: replied 3 years ago.
the heater is the one in the camper on a breaker and if i disconnect shore power then the complete camper goes dead i guess by battery needs to be charged. With that said will it charge when the camper is plugged into shore power?
Customer: replied 3 years ago.
just found out the when i turn the breaker that controlls the heater off the complete camper goes dead. The 110 and 12v so the microwave, the lamp and 12 volt lights.
Customer: replied 3 years ago.
also just found out that the A/C tries but will not come on.
Customer: replied 3 years ago.
also on the breaker panel it says its a power converter.
Customer: replied 3 years ago.
It all goes back to when there are enough lights on everything works fine. I can hear when the convert's fan is running at a high speed then the lights are bright and when the convert's fan is at a low speed the lights are dim.
Expert:  Steve F. replied 3 years ago.

Okay, disconnect your battery leads and see if the surging stops. If it does, your battery is probably the culprit. Your converter does NOT have the capacity to charge your dead battery, you will have to use an automotive battery charger for that, but first you should have the battery tested to see if it's faulty. It may be shorted out, which can cause the system to surge, since it will draw lots of power off the converter.

 

If the surging does continue with the battery disconnected, you may have a bad converter.

Customer: replied 3 years ago.
The battery is disconnected and the surging continued. I will have the converter replaced thanks for your help.
Expert:  Steve F. replied 3 years ago.

Okay, the only other possibility is bad power or EM interference, but since you have tried your trailer in two different physical locations, this would seem unlikely.

 

It is a pleasure assisting you. If you feel I have helped you, please consider clicking on "accept" so I can be paid for my time with you.

 

Please feel free to come back here and ask for me if you need help in the future.

Steve F., RVIA Certification
Category: RV
Satisfied Customers: 443
Experience: Journeyman and Master RV technician, Mechanical & Aerospace Engineer. RVIA Technical Consultant
Steve F. and 2 other RV Specialists are ready to help you

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