That's true if it's a slow-moving storm that hangs around for a few days, like the one in Houston a few years ago. Much more typical is the one that comes and goes in 24 hours or less, preceded and followed by typical summer weather. The downside for me is that 2 PW's require power management to be sure I don't run out of battery. I had no choice, because setback requirements meant a generator wouldn't fit on our property unless it was centered in the courtyard. In fact, it was my lovely wife who convinced me to go with batteries instead of plopping a generator between her and her garden.
In fact, a large generator of 20kw+ -- the kind with a fairly quiet car engine instead of a raspy lawnmower-type engine -- would've been my preference, but there's no way to fit it on my property. There's also some risk of losing natural gas after a really catastrophic storm -- that was the case post-Katrina, when water leaked into depressurized gas lines and interrupted gas supplies for over a year in many areas.
