20s8p battery 20 groups of 8 OR 8 groups of 20 better?

[Chambers]

As the title suggests

I'm designing a 20s8p battery.
is 20 groups of 8p cells OR 8 groups of 20s cells better and why?

I'm sure I've read about this somewhere but my brain isn't working today

 

[goatman]

8 cells are connected in parallel to make a p-group
20 groups of 8 that are connected in series is 20s8p

8 groups of 20 is 8s20p

 

[Chambers]

8 cells are connected in parallel to make a p-group
20 groups of 8 that are connected in series is 20s8p

8 groups of 20 is 8s20p

Thanks for the response,

Yes - you are correct, but I don't think I explained very clearly -

What I mean is:

I could make a group of 20 cells into a 20s 1p 'pack' then connect 8 of those 'pack's in parallel to make 20s8p

OR

I could make a group of 8 cells into a 1s 8p 'pack' then connect 20 of those 'packs' in series to also make 20s8p

Generally I see people doing it the second way - I was curious as to whether there is a technical reason or not?

 

[john61ct]

As the goat stated, parallel first then serial connect those groups.

Otherwise very unbalanced power flows, shorter overall pack life

 

[Chambers]

As the goat stated, parallel first then serial connect those groups.

Otherwise very unbalanced power flows, shorter overall pack life

Ok - makes sense, thanks

 

[999zip999]

To EZ monitor your battery thru balance wires or bms you parallel first then series.
You also need cells of same voltage to parelle safely . Then balance pack before installing bms as bms is best used for keeping a balanced pack balance. And not some wonky wonky pack to be put in balance.
What cells are you using ( brand and model number) and what are you going to use it for how many amps is your controller? As you must match your battery to your controller and motor.