All excellent questions that further highlight my ignorance in this area. I'm thinking some photos are in order.Still wondering, "what breaker"?
You said something about a breaker...but not what circuit the breaker is in. Solar input to the charge controller? Battery output from the charge controller? Inverter feed from battery? Inverter output to 120v plugs?
Incoming main from Hoover Dam to your workshop on the back 40?
Is the breaker labeled by any chance?
Basically what I was calling a breaker is a big switch in the control area of the trailer labelled "On" and "Off." None of the other switches work when it's off (water, overhead lights, plug ins, etc). There is what I thought was an inverter that also has some sort of voltmeter built into it. It also goes off when the main switch is thrown (and if I don't switch it off first, it makes a horrible squealing noise). That's the only monitoring device in the whole setup.
I appreciate all the assistance and will get some photos up to help illustrate, clearly I don't have the knowledge to communicate the issues effectively. I swear I'm not usually this useless.
Also, the battery folks just called. One battery is shot and the other only partially charged, so they're both getting replaced Saturday. We also discussed a charger and he assured me they have smart chargers particular to my type of battery available. (I've had good luck with these guys in the past, good customer service).