The new converter is installed. For once, something was as simple as it seemed it should be. And as far as I can tell, it's working fine. With the generator running as an AC source, there's 13.6V at the battery terminals. With the generator off, the battery shows 12.6V, which is essentially a full charge. I haven't screwed it down yet, in case I need to move it or something. Well, mostly because I forgot to put the drill in the car this morning.
And with the help of a $.77 plastic pipe adapter from Lowe's, I seem to have solved the "how to suck liquid from a bucket" problem, which means I can proceed to flush and "sanitize" the drinking water system.
The only remaining problem that I know of is the furnace howl; I forgot to check that this morning. It's not crucial just now, as afternoon temperatures hereabouts are in the mid-90s. With 3%. Yes, three percent humidity. It's a dry heat, ya know.
I think it's time for another shakedown overnight at Catalina St Park.