Are any or all of the mentioned "converters" totally transformerless?
Pure switching power supplies?
It is a more important to resolve issue with a generator than connected to shore power.
Question # 2
For what length of time, how many days a year does the OP boondock?
I'll preach this again. The difference between someone who boondocks for weeks on end is a different universe than for an RV'er who goes for the weekend, then returns and plugs into shore power and checks off things on a calendar while dreaming about camping for the rest of the year.
My Kubota costs around six thousand dollars plus shipping. When I start it and after it warms up, it grunts. I don't pay it to sit around and B.S.
C10 charging is superb, highly recommended for the weekender. But then it's a foolish, brown technology, expensive and frankly less than brilliant way to recharge batteries when a person is off-grid for extended periods of time.
When I argue with people who write incomplete battery maintenance recommendations, print them as gospel, and then think they have done everyone a great service, I win the argument. I have so many "But I did not intend it that way" or worse "You are talking about a limited market, percentage wise, few RV'ers boondock" or the best answer "RV? I was talking about off-grid solar" memories it isn't funny.
A mediocre engineer chooses a solution based on achieving HIS objective. His objective may be valid. But when that engineer does not DEFINE the parameters of how he arrived at that objective, his printed "Expert Instructions" he is remiss. Actually, he is lazy and should not percolate into a position to make invalid "truisms". This "crap" I read about "ideal" C10, C20, or C whatever charge rates never includes caveats about WHEN AND WHERE those rates prove to be superior to any other protocol. Most of the "crap" I read is rote. The site, the company did not and will not talk to a genuine engineer for years. It is pure rote. When you discuss factoids with anyone peddling merchandise with regard to the manufacturer's protocol, email or telephone them. Ask a specific question:
"When you arrived at your battery maintenance information, how, exactly and precisely did you obtain your information for charging protocol?" If they reply ENGINEER. It isn't good enough. Is the engineer a specialist with lead acid batteries? Did the engineer review and approve the OEM's battery maintenance manual information?
-I Have Growled-