48V 100A Battery suggestions

[Davy]

Hi, what battery setup would you suggest for running at 48V 100A?

Background:
I have a Motenergy ME0909 Motor (at 48V 100A continues with 300A peak) that I want to run for about 15min to a half-hour max. This is going into a barstool racer where size and weight are a concern. I have planned battery space for about 13”x15”. As for height the smaller the better.

I’m starting to look at LiFePO4 3.2V 10Ah cells, but the max discharge is only around 50A for continuous use. To get this up to 100A, I’ll need to build 2 packs of 15 cells (30 cells total) and wire the packs in parallel. This will give me 48V 20Ah and a max discharge of 100A continuous use. Is this correct or am I missing something?

With price, weight, and size in mind, what would you do? Would I be better off going with 4 yellow top batteries or something else?

 

[Amar]

if I'm correct, for amperage you need to wire in parallel and for voltage you must wire in series so your plan should work, but let one of the more experienced members make sure before you take my word

 

[itsid]

that's correct...

series add voltage parallel add capacity.

BUT, make 100% sure to level the individual cells before you pack them as a batpack.
That's critical to get all the capacity they can provide and also will make sure you do not overload a single cell.

'sid

 

[Davy]

Thanks. Does parallel increase max discharge?

 

[dcastillo]

yes it does, If your battery can only discharge, say, 50A max, by putting two in parallel, you can now discharge 100A...
A huge benefit this has with SLA batteries is the fact that a battery discharged at half the current actually gains more then double the life since their discharge rate isnt linear...
hence why I run two sets of 3 batteries in parallel, before each battery was pushing close to 50A, which killed them fast, now they only have to put out 25A... helps a ton