I posted over in your battery charging thread, but comments on your great diagram:
Originally Posted by zenmonkk
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Edit* #2 The charge controler should be connected to the battery not the battery charger?!
Comment #1 - Yes, the output of the charge controller and the output of the battery charger both go to the battery bank, but if there are terminals on the charger that are convenient to make the connection there, its OK as long as the wires are heavy enough for the current expected.
Comment #2 - With the battery selector switch your parts man gave you, the master switch in the drawing is redundant. The selector switch IS the master switch. Any switch less beefy than the selector may be too small for a master, depending on your 12-volt usage.
Comment #3 - RV "converters" act as both power supplies and battery chargers. Having a separate charger may be a waste of money.
What software do you use for your drawings? My pencil-on-napkin drawings look really old-fashioned.