Generally if the master switch is off, batteries do not charge.
How to find out
Turn on some interior lights,, Turn off master switch (Unpluged from shore power) Lights go off.
Now plug in,, If the lights come back on then switch MUST be on for batteries to charge.
NOTE: Some systems have a red light next to the switch. Most people thing the light on means switch on, IT DOES NOT
The light means the house has power.. Be it from the batteries or from the converter, it does not care, So do not trust that light. OFF is OFF true, but ON, may simply mean "Shore power".
Home is where I park it!