My comments on power is to look at it as a system, meaning pick a type and number of batteries that will provide you with enough reserve that you are comfortable with. Then pick alternative charging sources and see what they can replenish size properly from there as needed. If you have a generator how long will you have to run it to recharge your batteries with the smart charger or inverter/ charger you picked. Finally look at your engines alternators and use ACR's to supplement them charging the starting bank and then the house bank. These are all separate systems but they need to be all integrated. If you are lucky enough to have a generator that puts out 50 or more DC amps use an ACR to supplement the house bank. Judicious use of over sized DC cables never hurt after all power lost in the cables is a constant and you can't recover from their losses. I don't believe in the 10% loss for many devices I prefer to keep my losses at as low as possible even 3% is too much loss in my book.
Finally look at devices you can run on DC instead of AC and look to change out those amp grabbing lights replace them with LED's.
Bill
There is a another very important component to the equation. Your desired boating lifestyle (including finances). Then you have to match the systems to it, best as you can.