This is my understanding of 50 amp service for trailers wired to utilize it (Ex. Selgoja's mansion on wheels). Let me see if I can put it in Layman's terms without getting too technical.

Most experienced camper owners fairly understand the common 30 amp service. It's 110 volt, and you are limited to using a total 30 amps of electrical stuff in your trailer at the same time. Most have learned that you have to turn some things off in your trailer.... when using toasters, hair dryers, and other things that take a lot of electricity to power or you will trip the breaker(s).

Now with a 50 amp service, common sense says that you now have 50 amps of total power, as the name applies, versus the 30 amp previously discussed....or 20 amps more than 30 amps. (20 + 30 = 50)

Now the fun part: You have more than 50 amps total when hooked to a 50 amp service. This 50 amp service is 220 volt (2 X 110), but the service is actually split into two 110 volt sides....

**EACH** with 50 amps.

So, in reality you have TWO (2) fifty amp lines supplying power to your trailer....or a total of 100 amps when connected this way.....or as some voltage monitors say L1 and L2. This is over three times as much as a 30 amp service.

Because you have 100 total amps (over 3 times as much as a 30 amp), you can run all kind of electrical stuff at the same time now. 2 air-conditioners, water heaters, microwaves, toasters, hair dryers. etc. You are still going to be limited to the individual circuit breakers for each outlet. It's so much better than a 30 amp service.

Unless you get into some higher-end coaches, nothing in your travel trailer actually uses 220 volt, but everything works off of 110 volt either on your L1 or L2 sides. This is the part that confuses a lot of people.

The sides (L1, L2) share a common 50 amp double pole breaker and plug-in in the campground pedestal, so if there is a problem on either side, then the breaker trips....shutting down both sides. It might not be as confusing if the breaker had printed on it 50(x2).

Hopefully, this gives an easy understanding of the differences between 30 amp and 50x2 amp trailer service. It also is easy to understand why some campgrounds charge more for using the 50 amp service, as those campers have the potential to use over 3 times as much electricity as their 30 amp neighbor.

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