I’m not a sparky but would you need inverters if the panels are just for charging batteries? On the other hand, there is probably already inverters onboard to provide AC power to passenger power points.

No, you need some kind of DC converter to regulate voltage, but no inherent requirement to go to AC. Lots of small camping and off grid systems do that.

Although at the scale of a one off boat i would think it's cheaper to use the more widespread systems for bigger grid connected panel installations; so you are back to inverters.