Lots of lists and articles on the net that cover this. Here's one Boat Electrics; How to Calculate Your Daily Amp Requirement
However, the answer will vary a LOT depending not only on your boat and the equipment
installed but your usage patterns. Two boats with the same things installed could see 100% difference in actual daily power usage.
Example, the autopilot
is a big draw. A boat that is traveling a lot and using the AP vs one that spends a lot more time in port. Some stay up late and use a lot of lights, some cruisers go to bed
with the sun. So an power calculator can get you in the ball park but the best way to know is to install a battery monitor
and track usage. They're good to have anyway.
Another issue, if you have a refrigeration
system it might draw 20-30 amp hours/day for a small, efficient, well insulated box or 80-90 amp hours for a bigger, less efficient box.
Maybe post a list of when you have and some details.
And welcome to the forum.