Basically none, because that isn't how capacitors work. Capacitors voltage drop linearly with respect to the amount of stored energy. They are useful for transients in the very high frequency regime, not multi millisecond long periods.
That depends how much smoothing you want and how much you're prepared to pay for it.
Every AC-DC converter necessarily has some energy storage in it to cover the part of the cycle where the voltage crosses through zero. There's capacitors on the input and output of buck converters. But smoothing over more than one AC cycle? Not really much point in doing that.
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In particular, a WiFi radio uses a comparatively large amount of power but in short bursts. Gigabit ethernet likewise.
https://www.computerweekly.com/blog/Networks-Generation/Powe...
How much of that can be stored in capacitors to smooth out the peak AC load? Is that done at all?
Basically none, because that isn't how capacitors work. Capacitors voltage drop linearly with respect to the amount of stored energy. They are useful for transients in the very high frequency regime, not multi millisecond long periods.
That depends how much smoothing you want and how much you're prepared to pay for it.
Every AC-DC converter necessarily has some energy storage in it to cover the part of the cycle where the voltage crosses through zero. There's capacitors on the input and output of buck converters. But smoothing over more than one AC cycle? Not really much point in doing that.