Third, there's the problem of excess. If the installation produces too much power, it will means to sell it back to the grid. And this will require complex metering, and America's power grid could hardly be called high-tech or flexible.
At least here in Southern California, solar panel systems are routinely installed with the necessary electrical interface to allow pumping energy back into "the grid". In the daytime the electrical meter simply runs backwards. At night you draw from "the grid". The Southern California Edison system just looks like a gigantic capacitor. The deal with SCE is that you can zero out your electric bill but they won't pay extra if you run a positive balance. In any case it doesn't look to me like "complex metering" is a problem.
Indeed, we've had directional as well as time-of-use metering for many decades. It's hardly complex or "high-tech". Granted, it is a bit more expensive than a simple watthour meter installed at a house, but these metering functions have been in use in commercial and industrial services for a lot longer than I've been alive. And I'm a little old.