I like inverter/chargers. You get both functionalities in one piece of kit, which saves space on a sailboat where spare room is hard to come by.
You'll need at least a 100 amp charger. Once you get into that range, and inverter/charger is also pretty cost effective. You'd have to buy a couple of ProCharge units to get to 100 amps. A Magnum 2000 watt inverter with 100 amp
charging capability is about $1700.
Inverter/chargers also simplify
wiring a bit. I like the Magnum ones. One of their nice features two AC inputs, one for the charger and one for AC pass thru to loads. That way you aren't limited to 30 amps input to the charger. When your
batteries are deeply discharged, the charger can eat up almost 30 amps by itself, leaving very little for down stream
appliances (not that you should have any high amp
appliances being fed by an inverter).
Scott
Marine electrician