I’m aware that an MPPT controller should first be connected to the battery before connecting to the solar panels, but is this on first use only to let the system know the battery voltage, or will an MPPT be damaged by later disconnection from the battery whilst power is being received from solar panels?
The reason I ask is that there are circuit breakers/fuses between the MPPT and the batteries and it seems pointless to have protection that will kill the MPPT if it actually works.