On my boat, I have no lower voltage batteries, so if the propulsion bank or DC-DC converter had a problem, I'd have no 12V. That is a problem, and I'm realizing that if I did have batteries at 12V, the DC-DC converter probably wouldn't charge them because the voltage it supplies is too low (13.1V) and it's not a charger.
So I'll amend my initial comment and say DC-DC converters are simpler if you don't plan to have separate battery banks at different voltages. If you do, I think you do need two chargers. Setting up two chargers and a generator is surely possible, but you may want to consult a book or specialist. I think the generator could be set to trip on at low voltage, but would you want it to if it would come on each morning at dawn, only to charge for a few minutes before the solar would have come on anyway? I would want more complex controls.
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