Wow, I believe someone, is an electrical engineer, a really good electrician, or really like to tinker with stuff.
@marygreensmith I can say that you have recieved some really sound advise from @tobixen, and I agree. Check everything, but it sounds like the frig is a problem, a buddy Capt. Jo said it should not be near that high, he's an electrician as well.
Something else to think about, are you using a laptop? They are typically 60-90watts, at 60 watts that's +-5amps, at 12 hours is 60Ah, and maybe more with wireless, and watching videos etc. That and possibly lighting if everything isn't LED.