Cable choice for 65Ah 12V 3parallel and 2series wired

[Oyun-Erdene]

How to choose battery connection cable?
I have 6pcs 65Ah 12V
I will wire them 3 in parallel 2 in series.
It will be 65*3=195Ah
12*2series=24V

In this case according to the cable size chosing table.
50mm2 copper cable could handle 215A
35mm2 copper cable could handle 170A

Should I choose 50mm2 copper cable?
My load is 1200W
and My solar charcher is 80A mmpt
inverter is 1800W

Help me!

BR
Oyun-Erdene

[Sunking]

Minimum cable size is determined by the Breaker/Fuse size. Breaker/Fuse size is determined by the load. Your load is 1800 watts, use 2200 watts for calculations. If you do that requires a current of 2200 watts / 24 volts = 91 amps peak continuous current.

Not real familiar with Metric cable sizes but in the USA with 91 amps requires a minim cable size of #2 AWG copper with 75 degree insulation. I believe #2 AWG is equivalent is 35 mm^2. So 35 mm^2 or larger should work. Take your pick.

Keep in mind my answer is based on USA electrical codes, not where you live. FWIW USA codes are the most stringent in the world and meet/exceed most other countries. Does Mongolia even have building electrical codes?