Had an interesting private discussion with another forum member triggered by my post in the diagram thread.
Which is the proper way to build a big pack out of 18650 cells? First parallel (e.g. 4 cells) and then serial (e.g. 10 4p packs) for a total pack of 4P10S – or first serial (e.g. 10 cells) and then parallel (e.g. 4 packs) to get 10S4P???
Most people seem to go the parallel and then serial path and this path has many advantages.
However in order to build the ultimate flexible big pack I see many advantages in building 5S1P packs, then serial two of them into 10S1P, then parallel them to 10S4P
Assumption: no BMS
What do you think? Pro’s and con’s? Does it matter?