I am not familiar with your coach, but it sounds like your coach batteries are not connecting to the 12 volt DC wiring system of the coach. If that is true then your batteries are not charging either when on shore power. Use/store turned on? When you operate the use store switch do you hear a relay operating anywhere (clunk sound)? If not then you may have a bad latching relay for the coach battery (or its control circuits). If yes, then you may have a DC breaker that has tripped open between coach batteries and Converter output bus......typically 50-100 Amp breaker....... sometimes located near the coach batteries in many coaches; not sure where in a chateau though.
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