Anyone have suggestions on Battery Back up?

[Lampshade]

Watch out for computer UPS's, they are only ment to run for 2-3 minutes to allow an auto shutdown and quick save of files. They may have the correct rating and enough Amp Hours to run for awhile longer on your tank, however they don't have correct cooling to run that long and the transformer will melt through the case and cause a fire. There's some good youtube video's of this.