Originally Posted by jklingenstein
We've never had this occur in the last three years.
Wouldn't there need to be a voltage drain somewhere for the battery to discharge without anything drawing current?
I took from your first post that you thought it was an issue with the meter (perhaps incorrectly). If your batteries are actually discharged then you either have a dying house bank, or yes, you have a load on your batteries that your not accounting for. I'd guess you have a bad bank, or you're just not accounting for something that's on (fridge door open?). It would be very unusual to find a device malfunction or wiring issue that didn't just result in a short and blow a fuse.