Upon further thought, a couple more tips:
1) I believe you would be very well served by a 100amp magnetic-hydraulic breaker of the type below:
https://www.bluesea.com/products/7144
or
https://www.bluesea.com/products/7187
Either should provide enough margin (and trip-delay-time) to avoid nuisance trips, but still provide reasonable protection against motor overheating damage if someone abuses it. The first one (187-series has a 5/16" stud and clearance to accept a 1/0AWG lug; the 285-series has 1/4" studs). Note that the delay curves shown on the two look more different than they are, due to different scales used. Both have better time delays than a Series-C breaker, which is less well suited to handle starting in-rush and momentary overloads.
2) Using your leftover #1AWG wire is a great idea. If you have enough for both the negative and positive runs in their respective colors that's great. If not, there is a very slight advantage to making the negative the heavier of the two. The windlass won't care, but when measuring voltages at various points, it's easier for a sailor to get confused when the drop on the negative is greater than the positive. On the other hand, it's even more important to follow proper color coding, so unless you want to do a lot of color tape application, the color of your leftover wire you have will dictate what it gets used for.
1) I believe you would be very well served by a 100amp magnetic-hydraulic breaker of the type below:
https://www.bluesea.com/products/7144
or
https://www.bluesea.com/products/7187
Either should provide enough margin (and trip-delay-time) to avoid nuisance trips, but still provide reasonable protection against motor overheating damage if someone abuses it. The first one (187-series has a 5/16" stud and clearance to accept a 1/0AWG lug; the 285-series has 1/4" studs). Note that the delay curves shown on the two look more different than they are, due to different scales used. Both have better time delays than a Series-C breaker, which is less well suited to handle starting in-rush and momentary overloads.
2) Using your leftover #1AWG wire is a great idea. If you have enough for both the negative and positive runs in their respective colors that's great. If not, there is a very slight advantage to making the negative the heavier of the two. The windlass won't care, but when measuring voltages at various points, it's easier for a sailor to get confused when the drop on the negative is greater than the positive. On the other hand, it's even more important to follow proper color coding, so unless you want to do a lot of color tape application, the color of your leftover wire you have will dictate what it gets used for.