switch 20 amp brkers to 30 amp

Someone here mentioned having a 120VAC PLUG-IN AC VOLTMETER.

I have one of these plugged into a inside receptacle somewhere in the trailer where I can glance at it. This is is neat as it has a "GREEN" safe zone marked on the scale. If the 120VAC is outside of this "GREEN" safe zone tells me the AC Voltage may not be safe to use especially when turning on the Air Conditioner. These are not absolute readings but will give an idea of what is happening... I got mine from AMAZON but these are probably available at your local RV parts places..



Roy Ken

Also if the 30a main and 20a a/c breaker are a tandem breaker they may build a bit more heat together. If you have a second 20 amp breaker further down you can swap this with the a/c. That is swap the hot wires that come off the terminal. This will separate these two and reduce the heat a bit.

Purchase a <$10 A/C (alternating current) plug in volt meter and check the voltage in the RV. You did not mention if you are plugged directly into a pedestal or outlet. Should not use an extension cord unless it is sized appropriately.

A cleaning of the condenser will be on my to do list for today. I do remember that just after my husband passed away in July 2008, my A/C went on the blink. After two different people came out to check it out and it still didn't work, my son and friend cleaned the condenser and it has worked great since then. I had forgotten all about this. Again, thank you everyone for all your assistance.

Another thing to consider: Is the A/c condensor clean. If you use it in a buggy area or a lot of dust, cottonwood flying insects ect the air can't cool the condensor and will raise the amp draw. Cleaned an awful lot of air cond that didn"t work well before and ran like new cleaned. And to the amperage of the breaker, check on the nameplate of the A/C. it will tell you the min and max size fuse or breaker. And it will differant between fuse and breaker.

We had this problem last 4th of July in the Texas heat. Everyone running their air at the same time. We have a 30 amp 5th wheel and when voltage goes down amps go up and trip the breaker. I bought a 50 amp to 30 amp pigtail. We then plugged into the 50 amp receptacle and the voltage was much higher. No more tripped breakers for the rest of the weekend.

Low voltage can increase required amps especially at start up.
108vac when running is about minimum you should see in the RV.
Check it.

No. :) Fix the problem, don't create more. :)

Did you check the neutral connections?

I replaced the 20 amp breaker (myself:E)so far so good. But will not be surprised if I am required to have the A/C unit looked at before summer is over.