Warning: I am not an electrician and am not fluent in the NEC.
My grid tie system goes through its own utilty meter and is tied into the grid on the utility pole side of my original meter. They pay me based on the PV system meter and bill me based on the original meter.
That said, I thought the transfer switch for a generator was supposed to be wired so that the loads could be carried while at the same time the grid can't be fed by the generator. In other words, the transfer switch makes a physical break in the connection from the grid and makes the connection to the generator powered circuits. If your area is like that, then your Enphase {or whatever inverter you go with} array will be offline for the duration of the outage. The best way I know to keep your PV making power during a grid outage is to go with a Sunny Island inverter and a battery bank. I promise that going the Sunny Island route is a lot of upfront cost. Done right though and it would be a very nice system.
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