......If you want to play the "he's not listening anyway" card and stop discussing the topic, I can't stop you. But that's not the case: I am listening, I'm not understanding what's wrong with this approach.
Bill, no one is playing a card. It comes across as a rude way of engaging folks you’re asking for help. I think you’re probably a pretty nice guy, doing a cool thing and getting out cruising. It’s a touch hard to answer your question, because you seem to fixate on your own thinking. For me anyway, it comes across more like a dare to disagree.
Why don’t we start over. Deal?
I don’t believe your solar can possibly keep your batteries fully topped up. Many of us have explained that above. One issue you might not be familiar with is the charge curve. At higher states of charge, lead accepts less. It doesn’t matter how much you can create, you need time. The sun goes down, or in many cases is blocked by clouds all day and you don’t get the time.
Your alternator, if programmed properly, could do so on long passages. It will not put out rated amperage, unless at high RPM. Therefore, if using it at anchor or at the slip, you have you run the diesel up to high rpm, in neutral. That would tick everyone off at a slip.
Therefore, should you get to a slip, without fully charged batteries already (say you were sailing all day in overcast skies), a light charger will only keep up with your usage. The draw overnight, while your solar is inactive, won’t be properly recovered.
Your boat, your choice. A good charger is the best way to protect the longevity of your new, very expensive, house bank. Personally, I would want to get to shore periodically (or run a generator), to plug in and get a good proper Bulk-Absorb recharge. You’ll enjoy your boat either way, but poorly charging will just reduce your house bank’s lifespan. Many over build their Ahr capacity to allow for this, but that also comes at a cost.