Three trackers matter when the PV field cannot be treated as one or two identical electrical groups. Separate roof orientations, unequal string lengths or array sections with different operating conditions can each be assigned to their own MPPT. The datasheet lists 26A + 26A + 26A maximum PV input current and maximum PV input of 24kW, 25.6kW and 28.8kW across the series. For a mppt hybrid inverter, that reduces the need to force unlike strings onto the same tracking channel and gives the designer more room to organize a large array.
