Amps needed question

Uncledave54

Earning My Ears
Joined
Sep 25, 2019
Ok all you RV meisters, settle a bet for us.

We have a Forest River 21frbs travel trailer.
Do we have to have 50 amp service, or will 30 suffice.

Loser has to be on tank dump duty for the first week of our trip in October.
 

Teamubr

Formerly racing around the country.
Joined
Nov 7, 2010
For most RVs, 50 amp is only needed if you are running 2 A/Cs. I have seen some newer large TTs and 5ers with single A/C and a 50 amp cord. I suspect it is easier for the factory to build to one 50 amp spec since most people go with the 2nd A/C on the larger units.

For a 21frbs, I would think 1 A/C would probably do depending on where you live and camp.

Although it is possible to go over 30 amps with a single A/C. With my old 5er, the A/C, microwave and water heater on electric would do it.

j
 


  • FtW Mike

    DIS Veteran
    Joined
    Feb 4, 2016
    We have been at The Fort in January 3 times now and have gone from Heat one day to A/C the next.
    If you have 50 amp available to use I would go with it. The more appliances you use the more power you draw
     

    Teamubr

    Formerly racing around the country.
    Joined
    Nov 7, 2010
    What service does your TT have. I'm guessing, based on the size, it has 30 amp service. No way to make it 50 amp. Even if you use an adapter to plug your cord into a 50 amp outlet, the trailer will only pull 1 "leg" of the plug. Those of us with 50 amp service can run on a 30 amp connection with an adapter. I do that in my driveway. The only thing that doesn't work is the 2nd A/C.

    Look inside of the breaker box. There will be a main breaker, just like a house. The number on that is the highest amperage the trailer can use before it trips.

    j
     

    2goofycampers

    Sounds like something a camping trip could cure!
    Moderator
    Joined
    Feb 10, 2008
  • North of Mouse

    DIS Veteran
    Joined
    Mar 31, 2011
    Ok all you RV meisters, settle a bet for us.

    We have a Forest River 21frbs travel trailer.
    Do we have to have 50 amp service, or will 30 suffice.

    Loser has to be on tank dump duty for the first week of our trip in October.
    We have never needed 50 amp except when we run both AC's with another appliance like microwave or coffee pot. Our AC's can alternate so usually no issues. We take whatever is available.
     

    bigdisneydaddy

    Fan of all things Fort wilderness
    Joined
    Mar 27, 2000
    Our previous trailer was 50a, we carried a 30a cord with us that we used 90% of the time because it was lighter and easier to handle than the 50a. We ran the trailer regularly off a 20a plug in our 2200w generator during rest stops.
     

    Uncledave54

    Earning My Ears
    Joined
    Sep 25, 2019
    DW and I would bus to EPCOT and then a nice leisurely walk to CMC then back to EPCOT to walk off the calories and bus back.
    For most RVs, 50 amp is only needed if you are running 2 A/Cs. I have seen some newer large TTs and 5ers with single A/C and a 50 amp cord. I suspect it is easier for the factory to build to one 50 amp spec since most people go with the 2nd A/C on the larger units.

    For a 21frbs, I would think 1 A/C would probably do depending on where you live and camp.

    Although it is possible to go over 30 amps with a single A/C. With my old 5er, the A/C, microwave and water heater on electric would do it.

    j
    What service does your TT have. I'm guessing, based on the size, it has 30 amp service. No way to make it 50 amp. Even if you use an adapter to plug your cord into a 50 amp outlet, the trailer will only pull 1 "leg" of the plug. Those of us with 50 amp service can run on a 30 amp connection with an adapter. I do that in my driveway. The only thing that doesn't work is the 2nd A/C.

    Look inside of the breaker box. There will be a main breaker, just like a house. The number on that is the highest amperage the trailer can use before it trips.

    j
    Just in case the 30 amp isn't working at a CG we have one of these.
    We have had to use it quite a few times. Or sometimes we just needed a few more inches to reach the electric box.
    We have never needed 50 amp except when we run both AC's with another appliance like microwave or coffee pot. Our AC's can alternate so usually no issues. We take whatever is available.
    Our previous trailer was 50a, we carried a 30a cord with us that we used 90% of the time because it was lighter and easier to handle than the 50a. We ran the trailer regularly off a 20a plug in our 2200w generator during rest stops.
    So basically, if i understand everybody correctly, seeing that i have only one A/C, 30 amp service should be all i need.

    Thanks everybody.....
     
  • Sjm9911

    DIS Veteran
    Joined
    Feb 11, 2019
    Yup, 30 amp is what you have. As stated get an adaptor in case the 30 amp pedestal is broken. Most all campsites with 30 amp also have a reguler 20 amp 110 hook up. So , get a 30 amp to 110 . If you want to you can also.get the 30 amp to 50 amp hook up also. They also make one that has them all together. Your moat likely to use the 30 amp to 20 amp 110 cord. I use it at home. If this is your new TT, and your fist time camping, its also good to have a 30 amp extention cord. Some of the hook ups aren't in the best spots. Some campgrounds even share electrical pedistals. Depends on where in the USA you go and camp.
     

    PaHunter

    Jundland Waste Traveler
    Joined
    Oct 15, 2014
    Make sure you get a surge protector. I have seen people decide to rewire an electrical pedestal to fit their needs. It protects all the electronics in your trailer. If you have 30 amp, get one for that.
     

    Breezy2

    Adventurer
    Joined
    Jun 18, 2018
    Make sure you get a surge protector. I have seen people decide to rewire an electrical pedestal to fit their needs. It protects all the electronics in your trailer.
    Good advice and another suggestion: Learn about the difference between a Surge Protector and an EMS (Electrical Management System) and decide which is right for you. We have a Progressive EMS which protects our RV investment not only from surges but qualifies power parameters and shuts down in various situations like low and high voltage. It will also protect you from open neutral and the deadly open ground which we've encountered numerous times in our travels. Either way, something is better than nothing and cheap insurance.
     

    Stratman50th

    Mouseketeer
    Joined
    Nov 17, 2019
    Good advice and another suggestion: Learn about the difference between a Surge Protector and an EMS (Electrical Management System) and decide which is right for you. We have a Progressive EMS which protects our RV investment not only from surges but qualifies power parameters and shuts down in various situations like low and high voltage. It will also protect you from open neutral and the deadly open ground which we've encountered numerous times in our travels. Either way, something is better than nothing and cheap insurance.
    Ok, this! Ours has shut itself down more than once as a result of brownouts and under-voltage situations. EMS is really the only way to go!
     





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