> With modern electronics you could react very quickly if the draw
> dropped (current flow started to go negative) and essentially never
> backfeed the grid.
Such a project is already developed and it's Open Source!
http://openenergymonitor.org/
I was involved in this project in the very early stage, and
contributed some knowledge about the inner workings of revenue-grade
kilowatthour meters.
At the time, I was dumping excess PV production into the bottom
element of my water heater by detecting the rotation and speed of a
mechanical (spinning disc type) kWh meter using an optical mouse.
Direction and speed information was then fed to a servo-driven 60
ampere Variac autotransformer, which supplied the variable voltage to
the H20 heater element. It successfully stripped 99% of the PV
production over house demand every month for a couple of years before
I obtained a net metering contract from my utility.
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