How to connect BOS-G cables (4AWG) to the Deye 20kW HV (8AWG MC-4).

Dear friends, please support me in the assembly question of the invertor SUN-20K-SG01HP3-EU-AM2 and High Voltage Battery cluster BOS-G. How to connect BOS-G battery cables to the Invertor. Invertor uses MC4 type connection for battery cables (8AWG), with BOS-G I received battery for bolt and cross-section of these cables are (4AWG). How to combine these cables?
P.S. In the first stage, I will use only 4 batteries, and buy 2 additional latter.

Not intimately familiar with deye's bos batteries but reading the spec sheets the cable shown seems to be to large for what the inverter specifies also shouldn't include a lug, do you have the battery cluster control box? Each of the batteries would seem to connect to that with larger cables then a 8awg cable would run from the control box to the inverter.