Does the two-way meter have a way to prevent back feeding the grid in the event of a power outage? Having an unregulated device even under 800W seems like it could be dangerous to anybody working on the power lines.
Yes - such devices need a constant grid output to sync to. When the grid drops, their output drops. Furthermore, at 800W, it wouldn't be able to put any voltage onto the grid even if it tried to as it would get overloaded (it'll be trying to power up the entire neighborhood).