Right on, well I really appreciate all the info! I guess my current biggest concern is my wife and I are going to Hawaii in February for 12 days... We did the same thing last year for 12 days and our power went out due to a down line during our trip. I didn't have saltwater at the time, just my to freshwater tanks, and they were fine.... even with the temp drop.
My sister lives just a few miles from us and takes care of our pets while we're gone. But there could be a scenario where the power is out for nearly 24 hours before anyone would notice... So I'm trying to figure that out best... I'm honestly just not going to stock my tank anymore than it is before then (I just have a favit, the candy cane colony, some green star polyps, 2 snails, and 2 clown fish.... But I guess there's just no preperance for the absolute worst case scenario, which would be an easy automatic backup for up to 24 hours. But it sounds like your ideas have been sufficient for the majority of outages where I'm around, or my sister is.