IMO I wouldn't spend too much time on fancy controls. Its not that I don't enjoy a good technical challenge, but since most electric use will be while you are there, it wouldn't be too much trouble to throw an extra switch now and then.
How I would handle it is to shut off my power converter/charger so the batteries are charged by solar panels only. As many AC loads as possible would be set up to be run on an inverter.
The metered shore power would be left plugged in just in case I needed to turn on the air conditioning, or there was a long cloudy spell that kept the panels from topping off the batteries so I needed to turn on the converter/charger for a few hours.
The one thing you have to factor in is battery cost. If you discharge and charge your batteries everyday there life will be shorted accordingly. So you you might save 100 dollars worth of power but have to purchase 500 dollars worth of batteries 3 years sooner, than you would have normally.
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