Grid-tied? Did you see this?
Not to spoil it or anything, but...
It turns out that an installation that was signed off on by the installer, the inspector and Jack Rikard hisself was structured such that he was selling power to the grid at 2.4¢ per and buying it back from them at 12¢. ...Across a one and one-half inch shunt. ...For twelve years. He can't be making this up.
Also, where does the excess power go in a buffer overrun condition?