Yes you did. It's exactly that, not overtaxing your powerplant by pushing too much water, and actually reducing your push.

YARR!

Bootie

... bootie and boobies!

. There is also the possibility of combining the Etek at 48VDC, a battery bank and a small Honda or Subaru driven generator into a hybrid of sorts.

I'm having fun spending my afternoons chatting over beers with marine engineers.

That sounds like a good idea. Keep all your options open.