Eric, the manual says to use an additional 600v dc breaker on the PV line..but that is not required per say and there is still a disconnect ...
maybe something to add a little later...?
I would recommend installing a dc breaker when installing the system. Although the 6000xp has a PV on/off switch, it is still necessary to install a DC breaker between the inverter and the PV modules.
another thing....most people will use a small load center panel with the XP. If you leave the ground/neutral bond default on the XP,should you
un bond the neutral that is in the little load center..?