Dan, that would need to be some big dynamo to supply the Watts output needed.
From my college days 746 Watts was equivalent to 1 horse power (not allowing for any losses), so the generator would have to be huge.
I would think that a 3kw or 4kw would work for 220v charging. These generators are used a lot in motorhomes over here and are powered by flat twin Onan 20 hp or now the Kohler V-twin gas or LP gas power.
But necessity is the mother of invention. When the need is great enough, people find a way to make things happen.
