We installed solar panels a couple of years ago, and
they've been a Good Deal. (Like, zero electricity bills four
months a year. In New England. :-)
But my jaw dropped when they explained that they won't
work during power outages(!).
The base problem is you have to avoid putting juice on
the grid when a lineman's up there thinking everything's
dead. Not good. There are ways to avoid this (ask anyone
who has a gasoline generator hooked to their breaker box),
but presumably the vendors want to keep the cost down so
far as is possible.
So there are two aspects that may come to bear.
First, the inverter (takes DC from solar panels and
converts it to AC for the grid) is rigged to shut down
immediately if there's no grid power (and wait five
minutes after it comes back to resume operations).
Second, it must synchronize its AC waveform to accurately
match what's coming in. (Things get wasteful if it's a
little out of phase, and dangerous if it's a lot out.)
So what I'm going to ask the inverter manufacturer come
Monday is whether the incoming waveform is used to decide
whether we've got kosher grid power. If so, will these
experiments cause the frequency to depart from 60.00 Hz enough to
cause the inverter to turn itself off? If so, there'll be
a lot of people with solar panels who'll be very upset
with these changes.