Wire size for parallel connection of LiFePO4 batteries of different capacities?

[JohnnyBravo]

Hi,
I have the following LiFePO4 batteries:
1 x 40Ah from Liontron
1 x 84Ah from Liontron
1 x 100Ah from Victory

I want to connect them in parallel for running my stuff (mostly fridge with freezer, lights and TV) from AC (probably I'll get a pure sine wave 2000-3000W inverter).

Can you tell what wire size I should use to connect the batteries in parallel?
The size is selected based on the load surge power?
In case these batteries are not at the same voltage level, will they be damaged with their attempt to level their voltage?
Thanks

 

[Ampster]

Yes the wire size should be based on surge or expected continuous load. There are several wire calculators online and in the resource section.
Paralleling different capacity batteries is not ideal. If each of those have BMS the currents between them may trigger a BMS.
Yes it is best if they are at the same voltage because the surge could trip one or more of the BMSs when you connect them.

 

[solarsimon]

I would join them up with a long thin wire initially - a pretty crude way of limiting the current until you're balanced