Which Virgo model should you choose?

“The 3K-S delivers 3 kW output, the 4K6-S 4.6 kW and the 6K-S 6 kW. The permitted solar PV input is 8 kW on the 3K-S and 9 kW on the other two, always across 2 MPPTs. All three use the same 48 V Heiwit batteries and charge or discharge at up to 5 kW.”