Originally Posted by TangoCharly
I am going to change the unit out when we get back just on GP. To be honest I am not sure I can trust the "convenience panel" lights.
From your description of the problem it sounds like you have a bad converter or your converter is not getting any AC voltage or there is breaker blown somewhere. Many converters have a resetable circuit breaker located somewhere near the BCC. In any case, you are not charging your batteries with the converter for some reason.
Since when you start the engine the convenience panel immediately shows full charge, that indicates that both your alternator and your battery isolation solenoid in the BCC are functional. Of course that indication only shows that the alternator is providing more than 13 volts and not that the batteries are actually charged. In addition, since the 2/3 charge held when you turned off the engine, the battery disconnects appear to be working as well in the BCC.
If you drive regularly, this may have been happening for some time it is just that your alternator and engine was keeping your house batteries charged since the problem first occurred.
Check the input and output voltage on the converter output if your have a separate converter, if not it is a little more difficult since the converter AC and output are all within your power center. Many vendors have a drop in replacement for the WFCO converter installed in a single panel/converter assembly.
As far as the status panel is concerned, life is so much easier with a real battery monitor like a Trimetric. It would have warned you about your problem a long time ago! You can see actual converter voltage and charge current at a glance...not to mention your bank state of charge as well.