Battery/converter issue?

I'm hoping someone can help me on here!  I have a 2006 PP Travel trailer, 36 ft.  I'm not sure if we are having converter or battery issues.  Bought a new battery last year because we were having some issues, and actually got a 50-amp power box installed at our site (We camp at Lake Carroll, IL, which is known for its electrical issues in the campground).  The battery was fully charged when I brought it back yesterday and hooked it up to the trailer.  Her is the gist of my situation after spending all weekend frustrated - Woke up this morning, the battery was fully charged, 100%.  No lights or anything were being used at the time I checked the battery, as it was first thing in the a.m. and no lights were needed.  After, I went inside, and turned on the lights inside, went back outside, and the battery charger said that batter was completely dead.  As soon as I turned on the lights, the battery went dead.   Had some frig problems last night (we have the propane tanks being refilled, both of them, so there is no gas at this time), check light flashing on and off, etc.  However, the biggie today is this - Took the battery completely off of the unit and we have no power, nothing...no refrigerator, no lights, no nothing, BUT we can use the outlets and those are working fine.  The 110 from the outside seems to be working and coming into the camper, but does the frig run off of the battery or the electric? It seems very strange if the frig would run off of the battery!!!  But when I took the battery off, nothing, no power at all in the camper, but the outlets work fine.  Do I have a bad battery, or a bad converter and my converter is not converting to 12V into the camper?  It just seems strange that the frig would run off of the battery.  If it's supposed to run off of the electric, then do I have a frig issue too?  I have read some posts on here, and realize that there have been some problems with the converters.  If anyone has any ideas, I would appreciate it!!!  When it comes to electric, I have NO CLUE.  I'm a mom!  I don't do electric!   

The converter has a fuse at the bottom.  If this fuse is bad it will run down the battery and everything that runs on 12volts.  I know .. I have been there.  Yep the lights work, TV and microwave but lp detector, frig, and heater would not run on a dead battery.  If there were power issues it could have shorted or something to blow the fuse.  Check that out it may be the root of your problems.

Blew the converter fuses by accidently touching the the postitive (white) lead to the negative terminal.  On my unit the converter is at the main fuse box.  Look for two large orange fuses, pull them and see if they're blown.

We have a 2008 PP travel trailer.  The location of the original power converter was under the bottom kitchen drawer.  We have had a lot of problems with the power converters and are currently on power converter number 8.  The unit is going back to the factory when we are at the rally in July so Randy can look at it again.  We had the power converter moved to under the stove because there was more room for air to circulate.  We still can't figure out why we are going through so many power converters.  We think there must be a short somewhere in the trailer.  Maybe a staple or screw is touching a wire and depending on how the trailer flexes, it shorts out.  We carry a small battery charger with us.  When the converter goes out we hook up the charger and we have 12 volt.  Without 12 volt, none of the thermostats will work so no refrigerator, furnace or AC.  This is the last year for our PP.  Recently the hanger bracket for the springs and axels broke off.  I now have a large piece of I-beam as a souvenir to bring to the rally to show everyone.  My thought is Lippert buys Chinese steel.

Good luck with your frustrating problem.