Yes, I wasn't considering New England when talking about solar panels. I was thinking north of Sydney and more tropical locations.
I am offgrid currently so apart from needing a 45kg LPG gas cylinder swapped every 6 months and maybe 20L of unleaded every 2-3 months for the 2400w generator for cloudy periods, I don't really need more than that. I have a 1.2kw solar array and 8x6v 225A/hr batteries (both of which are pretty small by todays standards, many homes have 5-10kw worth of solar, and batteries are becoming more affordable all the time). 10 years ago it was pretty fancy.
But in an emergency situation, if you aren't terribly ambitious, 160w + 100 A/hr is enough to survive on. You won't power a whole house. But you can charge phone, laptop, battery powered hand tools (drill, reciprocal saws etc), torches and if your in a sunny area a small 12v fridge etc. Its what I plan keeping in my fire bunker (battery and solar panel). I assume in a fire my solar setup/generator would be completely destroyed. Enough to help clear debris, to allow vehicles in or survive in place for a few days until they can or re-establish coms.
I wouldn't plan to have any shelter/bunker to far away from the home. In a fire type situation, it is most likely mean sheltering for less than an hour with the door shut. Cyclones/hurricanes can take much longer to pass, and predict when they will hit. Spending considerably longer time would mean you would want a larger more capable bunker with much larger stores. Cyclones and fires would have pretty significantly different needs and wants.
For me, fires and storms, the key focus is survival. Im not trying to protect my whole house or run everything after a disaster hits. There will be no house, no cars, no neighbors, roads most likely will be cut. Its just to make survival through it possible and hopefully enough that afterwards you are alive, uninjured and are sufficiently comfortable not to take risks to seek assistance or help and ideally be able to help others near by.