My main project for the boat was a custom built high current low voltage motor controller. The highest current i've tested the prototype to was 500 amps, but it could probably handle much more. We never really had the chance to test it.
Stony Brook Solar Boat
We built from scratch a carbon fiber hull, the first year we competed with the boat we were in last place, my final year we placed 5th and last year i advised the team when they took first place.