That's a neat and clean kit in
@JRT s post.
Do you have electrical experience? Working with marine AC is a little different than house AC and as always it can be a killer.
What do you plan on powering with your shore power? Battery charger? Outlets for plugging in appliances? Hot water heater?
The main components are the shore power connection, AC main breaker and sub breakers. How many depends on how many circuits you need.
Check out the Blue Sea Systems AC breaker panels at
www.bluesea.com Read the instructions and other info they provide. It will help you understand what your getting into.