Today is our wedding anniversary. 35 years!

Continued analysis of power distribution and loads and battery capacity. I have a list of questions to ask TCW tomorrow. I'm considering adding a "Avionics Master" switch and changing the TCW IBBS 1 charge/sense line from a fuse to a pull-able breaker. I think I need to be able to power the avionics from only the main bus OR only the TCW IBBS backup battery. The design currently powers the avionics from the main bus with the TCW as backup. I think the current design will deplete much of the main battery before the TCW backup starts powering the avionics. I could switch off the main bus, but don't want to do that because I need lighting and possibly pitot heat and other things. If I leave on the main bus on and powering avionics until it is time to land there might not be enough power left to run the boost pump and landing lights.