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I want to use two Orion-TR 48-12-30 isolated DC-DC converters wired in series to float charge a 24V AGM bank from a 48V LiFePO4 bank. In the future I want to use these to provide 12v and some 24v from a 48V system, otherwise I would parallel 48-24-16 converters which would operate more efficiently. Will this work?
Two 12V units with their outputs in series would not work. This is because the negative of one of them would be referenced to the positive of the other one with no fixed reference.
You'd be better off with two 24V output units in parallel.
