I would appreciate it if you would study this connection, between an MPPT regulator and an Argofet or Argodiode, which prevents the opening of the regulator battery output connection, and find out if it is feasible.
In the case of not supplying the "Energize" terminal with permanent voltage, the regulator, when there is no current from the solar panel, remains disconnected.
Here you can see the proposed scheme...
