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An interesting point would be that frequency of the AC power line is used for timing, what's more your supplier will generally try to normalize the frequency http://www2.nationalgrid.com/uk/Industry-information/electri... if if they're alternating too fast they'll slow it down to compensate and give an accurate long-term average.

I wonder if home-solar converters have this feature built in :)

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Home solar converters will need to synchronize to the mains power supply like any generator before connecting. The power supply capacity of the grid is orders of magnitude more powerful, so connecting it out of sync will still cause it to sync, however, it most likely won't be pretty. Once it's connected, the grid will force it to stay in sync.

Here's a video of a generator who's synchronization system is being "hacked": https://www.youtube.com/watch?v=fJyWngDco3g Although the article doesn't mention it in specific, that's what the comments say is happening.

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