Gut check lithium 4S6P battery connections

Wikel wrote:
Still working to figure out this whole solar battery thing. This is focused on:

1. The series interconnections between 3.2v lithium battery cells to create a larger 12v nominal pack.
2. The parallel interconnections between 12v nominal packs to create a larger AH battery array.
3. The link between the positive and negative connections and the upstream charging / discharging components using the battery array.



1. Would this be a correct setup and if not, what needs to change?
2. Is there a more effective way to arrange the battery configuration. If so, how and why?

Thanks for any feedback!

Chris Bryant wrote:
The only way I could see to improve would be star wiring positive and negative- a lead from each 4 pack to a central point, instead of jumpering between packs.

Wikel wrote:

mapguy wrote:
Think you want to do 6p4s. What cells and BMS are you considering?

Remember RV usage is similar to house battery systems on boats. Not really similar to EV battery systems due to the constant loads and multiple charging sources.

Take a look at the following web pages:
http://www.pbase.com/mainecruising/lifepo4_on_boats

https://www.entropypool.de/engineering/

http://nordkyndesign.com/category/marine-engineering/electrical/lithium-battery-systems/

Clab batteries 180AH 3.2v.

BMS I am still exploring but don't want to put that into this mix until the basic electrician approach is defined.

I'll take a look at the 6P4S vs. 4S6P. That does change some things even though the output is the same. Thought I had read somewhere that do P first and then S vs. the other way. It also affects in and out boards for BMS cell/pack communications and monitoring (less in and out boards at a pack level (4 packs vs. 6 packs).
Thanks

mapguy wrote:
Think you want to do 6p4s. What cells and BMS are you considering?

Remember RV usage is similar to house battery systems on boats. Not really similar to EV battery systems due to the constant loads and multiple charging sources.

Take a look at the following web pages:
http://www.pbase.com/mainecruising/lifepo4_on_boats

https://www.entropypool.de/engineering/

http://nordkyndesign.com/category/marine-engineering/electrical/lithium-battery-systems/

MrWizard wrote:
Have you been to one of the DIY electric vehicle sites
Have looked at the battery packs involved
As I remember it, there is more wiring
The cells are Managed by the BMS, the battery monitoring system

Your drawing is the basic hook up of the discharge path
The charging system path is more complicated overlayed on top of this, more connections and wires directly from the bms

Chris Bryant wrote:
The only way I could see to improve would be star wiring positive and negative- a lead from each 4 pack to a central point, instead of jumpering between packs.