Morningstar Corp, covers the basics of their TriStar MPPT 600V Solar Charge Controller. The TriStar MPPT 600V family of charge controllers started off as a purely off grid charge controller. In its basic form, it is a stand alone charge controller, but also can come with a disconnect box for US National Electric Code compliance to disconnect the PV. It also comes available with a transfer switch variation for retro fitting grid tie systems for battery backup.
All TriStar MPPT 600V charge controllers come with the option for a Ground Fault Protection Device (GFPD) which detects a current imbalance so that if there is current leakage to ground, the sensor will trip both poles of the solar array leaving the array to be worked on safely.
The 600 volts is a standard for many high voltage solar power systems now to allow for longer wire runs, reducing component costs. The 600V also makes for an easy retro fit to a grid tie solar power system without rewiring the solar array.