Its certainly a great asset in times when the main power grid is down. Always assuming that the panels are not being damaged by the storm as well. And that the sun comes back soon.
But the battery backup can prevent the worst, I guess, if you are not wasting too much power for unneccessary things. I have been wondering, for example, what happened to the food in deep freezers and fridges of the people, if the power is down for several days. I guess that can lead to a significant financial loss. And a nasty smell.