Yoop:
Your best bet would be to hunt down a electrical 'power' engineer.
Maybe Scott35 will jump in here on this, but I'm in with Greg...that water is much to deep.
Looking at 430.250, I would take a stab at an FLA of 800 amps @ 480 and 640 @ 575. Just using an approx 20% diffeence from 480 to 575.
Could you not use a 480 primary, 575 secondary transformer, instead of a buck/boost.
