Best way to switchover between 2 power supplies?
The above method must limit the charge current to each battery and also limit the voltage for OverV and UnderV protection using a buck type inductive switch for continuous operation until equalization and full charge or cutoff conditions are achieved. This might give some optimal (TBD defined)  CC , CV and cutoff states.
Current and voltage sensing is required for each controller port, as well as some indication of battery state.