50amp wiring question

You need an adapter like this and it will work just fine Clicky 

if you try to pull more than 50A however (microwave, air conditioner, electric water heater, and electric fry pan all on at the same time) the breaker will blow. Just turn something off, reset the breaker, and you’ll be good to go again.

one ac will work fine off 30 amps service, if it wasnt for the start up serge it would most likly run off 15 amps.  the major difference is you don't want to be watching tv, microwaving your supper and then start up the ac as that much load may trip the breaker..  just be concious of high power draw items running at the same time and you'll be fine. 

First figure out if you actually have both legs of the 50A active in your camper and what is hooked to what. It’s not unheard of having the 50A plug and panel in the camper and not have both legs hooked up (for campers that have the ability to add additional appliances). 
Have heard it here before and rented one last summer that was the same way. 

One of the side benefits of the 50A surge protection I have is the app that lets you see the power draw on each leg.. It's on my to do list to document which devices are on which leg. We know the AC runs fine using one adapter to 30A

My daughter lived in our motor home for a number of months after she accepted a new job. It was 95+ degrees and some high humidity there too.  Ran a single air unit on 30 amps. An issue was, she came home to a hot motor home, a couple of times,  as a result of the air unit icing up. Understanding how air conditioning works is a major plus to keeping it operating properly. If you are going to keep animals in your unit, be good to have an app the allows you to track / alarm interior temps.  I believe Govee sells such a unit on Amazon for about $40?  

They sell adapters for just this purpose. Stop by any camping store and you can pick one up.

Keep the water heater on propane and don't run the microwave while the air/con is running (or any other major electrical draws). Small stuff like the TV shouldn't be an issue. This is how your typical 30amp RV works.

My question is why? Not sure what you have been reading about the cost of 50amp service being more. I guess it depends on what type of park you are staying in. Most standard rv parks power posts have both a 30 and 50 amp plug. 

With that said if you are planning on living in it while at school and you want the comforts of home stick with the 50 amp. You will use less propane (water heater) as you will be on electric. You will beable to use electric heater when the temperature get alittle cold. If you were on 30 amp most of that would not be possible. 

Good Luck 

If you really want to live off of 30 amps to save money my guess is that you want to do it for as little cost as possible.  This basically means that you need to avoid running more than 2 major power draws.  And, you probably don't want to run your water heater on propane.  Probably not you stove either.  Propane is expensive and not included in the cost of your campsite.

So you get to chose two things to run at any given time.  Once your batteries are charged up your shouldn't need to worry about you power converter as it will just be supplying whatever is currently running.  Hopefully you have LED lights for a minimal load.  An RV refrigerator  on AC power generally runs about 2 amps max if you don't have or use an icemaker.  So, run the AC and carefully choose when to run the other electric devices: water heater, microwave oven, electric cooktop, hair dryer, etc. and you should be good.  

One major concern left, the two AC units on my 32ft motor home struggle to keep it cool in 95 degree heat and it is fairly well insulated.  Electric cooktops put a lot less heat in the camper than propane and induction cooktops put in less than the resistance type.  I have a double burner type.  It manages the power load to help prevent overloading the circuits.