Having trouble with 30 amp service

Check your energy management system. Make sure it is seeing the type of service you are connected to.
You may have to manual select the 30 amp service.

I have a Monaco. It has priority when I plug into 30 amp Vs 50 amp. It decides what it wants to run. That is compounded by some of these RV parks advertise 30 or 50 amps and they don't supply anywhere near that amount. I was in SW WA and plugged into 50 amp and blew the breaker with one A/C on. The owner replaced the breaker and I could run both but the voltage was very low. When he opened up the box it was wired with what looked like #12 wire. Once the MH cooled down I only ran one A?C. I was only there 1 night.

Have you had problems in other RV parks?

Electricity is nowhere near my expertise. This is what I would try....Do you currently have a neighbor? If not, and your cord is long enough, maybe try to connect to that site and check to see if the symptoms are the same. If you have a neighbor and they are abiding,ask if they may disconnect and let you try their power post. May give you an indication that the pigtail has failed, or you just have a bum site??? Just throwing out some guesses. Hope it works out somehow!

Force the water heater and refer to gas then you should be able to run one AC. As for the battery going dead? No clue except to ask how old is the battery? Get out your volt meter and check them. Converter should be putting out approx 13.5 volts as measured at the battery