I know you are a man who does his research. That's why I'd like to hear more about your backup power plan? I know you will be faced with certain, unknown time frame, power outages. I know you've conversed here about it a lot, so please excuse me for not remembering the big picture.
Here's what little I know.
My guys tell me to avoid battery backup if at all possible, and to use generators for backup. The time it takes a backup generator to kick in can be minimized, but will still be a half minute outage. They say to buy solar panels to get you near "net zero" for regular usage. If you want air conditioning while on generator, you will need a decent sized genny. Powering with propane or natural gas will eliminate stale fuel problems. Former military diesel gennys can be good bargains if you know what you're doing.