Good to hear your system is working for you, whatever you install that's what's important at the end of the day.
I'd question whether it's necessary to accomodate your refrigeration on your back-up system but I gather from the general chatter that some areas are getting longer shedding periods than others. In CT we're generally getting 2.25 hour outages and my chest freezer goes from -19C to -15C in that period when it's half full. My fridge ends up around 10C in the same period so I didn't consider it necessary to have them running on my inverter. Obviously if you're having 5 hour outages it may be a different ballgame entirely.
Chargers are incredibly important, don't skimp on them. Cheap and nasty battery chargers are the fastest way to destroy perfectly good batteres. Make sure any charger you buy is at least 3-stage with a float charge as well. I can recommend the Optimate chargers for smaller battery systems.
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