Here is a really easy battery system to build.
No busbars or flimsy ballance leads.
I swaped my growatt SPF 5000 to a Victron multiplus 2 48v becouse of the narrow voltage span in the growatt.
I hope that this video can bring some light in how to connect this type of battery module to a Daly bms, ore any bms.
Make sure to not load the balance leads with more then 200mA.
The leads in the battery module is very thin and if you short them or load them with to high current those can fail, leaving you with a useless cell module!

Note:
Those batterys are dangerous and should be handled with respect and not be installed in your house. A stand alone garage or shed is what i recommend.