Your wife and kid were busy so you single handed across the Atlantic?
Sounds like you might not be the average sailor. My compliments sir!
Anyway, don't let me talk you into anything foolish. I am an idle
speculator and my experience with anchor windlasses is limited to having
used a few here and there.
Just as a matter of comparison, here is a manual for the Lewmar H2/H3
models. I realize it might not be a direct comparison but the numbers
seem similar to the ones we are bantering around here.
http://en.lewmar.com/support/PDF/windlass/H2-H3_manual.pdf
The H3 is sized for 12-15 meter boats and 5/16" or 3/8" chain. It is
rated at 1000 Watts, has a 860kg/12V and 970kg/24V maximum pull, and a
45kg working load. The manual calls for it to be fused at 85A on 12V
and 60A on 24V. So it looks like if yours is similar, starting with a
150A fuse might be a little too high.
I'd probably start with a 75A fuse and make sure the wiring was all
sized right for the run lengths. And I'd agonize over the cost of it
all and also have some 75A and 100A spares available.
If it blew a 75A fuse I'd like to try to immediately get my eyes and
hand on the motor housing to see how hot it had gotten before I went to
a 100A fuse.
Of course having things like clamp on Amp meters to watch with the motor
under load are wonderful for learning about the limits.
I learned the hard way once that a windlass that was properly sized for
lifting the ground tackle was not up to the sustained pull and run of
getting the boat up and over the anchor. Since then I've come to think
of them as something that you should lighten the load on as much as you can.
Good luck with that and the rest of your trip.
Jack