Which connection is best for parallel packs?

[sd_dracula]

I have a pack of 32 eve cells 305ah in a 2p16s configuration and I'll be splitting them into 2 x 16s packs with their own box/bms.
Wondering which of these two methods is best for connecting them together.
(I do have a 200a fused disconnect before the inverter connection)

1. Use a solid busbar between the -/+ of the packs and then wire pack 1 positive/pack 2 negative with 2x35mm2 to inverter?

2. Wire each pack with 35mm2 cables to inverter and not join the packs together at all?

 

[chrisski]

Layout and expansion would likely drive wiring.

For 2p batteries, Unless the wires are long, I’m not sure either method is better:


Because of wire routing with 8s2p my pack, I went with method 2, and left the option for a third battery with each separate battery fused and fused again after combined.

 

[sd_dracula]

Thank you for the detailed comment.
For now I will only have 2 packs of 16s but will probably expand to 3 later on this year.
As I understand, method 3 is the best but might not be worth it.
My two packs will be max 150a charge/discharge each and if I add a third then 100a each.
Is this a good way to hook up as per method 3 or is it the same as 1. above? (the busbar will be insulated ofc)?

 

[S Davis]

If it was me I would wire them so one could be removed and serviced while keeping the others operational, JMHO.

I am setting up a system with six 24volt 304ah batteries to start and adding another 4-6 down the road. Each battery has a 200amp breaker and will be wired to buss bar with class T fuse, I will be able to isolate and remove any of the batteries with out turning the system off. Just size the buss bars and wire for your future addition.