It might only be good for 400 hours then it's scrap metal, but that's still 20+ days (assuming 8 hours of sleep when it is off) of enough power to keep the basics running. If you need a supplimental gennie, or one that you can keep out in front as a decoy, or are just someplace with really well protected (ie burried) lines, then this might not be as bad an idea as it sounds.