I'm starting to give some thought to my power source on the house boat I am
refitting. I am leaning towards using isolators to seperate the battery
banks. I would like some experienced feedback on what type of isolator to
use; diode, FET or solid state? All I know at this point is that the drop
across the diode type can play havoc with the battery life because of the
voltage drop never allowing a full charge (?). The other two kinds I have
not been able to get anything except that they have a much smaller v drop
(FET) or none (solid state). And that is from sales materials. Will using
isolators allow me to forgo the 12Both switch and just use an in line on/off
switch?

May seem like a dumb question but how do I know what size of charger I will
need or does size (amps) matter other than how quick it will charge the
batteries. I plan on having two start and two house batteries.

How important/neccessary is it to have a galvanic isolator on the AC side?

THX