Bus Bar / Shunt connections - How to improve the connection ?

[EPicTony]

I have 4/0 cable going to my battery racks. I have the charging current set to 230A which is the limit for 4/0.
During charging @230A the wires get warm but the connection points at the bus bar and shunt get a lot hotter (almost too hot to touch).
I have torqued them pretty tight and don't want to over torque them. Is there some way to insure a better connection ? I'm sure the heat is produced by the added resistance of the connection and not undersized wire. Any tips ? Thanks

 

[yodamota]

having just dealt with the busbar on a eg4 server rack, I am not sure if they have upgraded this since. But the one I was dealing with had what looked like brass inserts for the bolt to connect to. As in the wire terminal had a brass insert in between it and the busbar. I believe this to be a version 1 or whatever of it. AS the eg4 batteries are also the version one.

We removed all the inserts and mounted the battery terminals with bolts/nuts directly to the busbar.

Do your busbars have a insert in the way?

 

[EPicTony]

No the connections to the bus bar are direct. The EG4 busbars are good no temperature increase there. The temp increase is on my smart shunt connection (4/0) and the short 5" bus bars where the inverters connect to the 4/0 battery cable.