Attaching multiple Bms to a 4S Lifepo4 bank

[PeSCaLo]

Hi Guys,

Is This Video from Will still relevant?
I have High discharge cells, 20C and wish to have 200A discharge with a 20 Ah 4s Lifepo4 pack, with 2 X 100A Jaibaida BMs. Wanted to know of any issues or updated information?

@Will Prowse

 

[DIYrich]

I wouldn't try to get more than 20a from a 20ah lifep04 battery. In any case, parallel bms should work. Just don't run at more than 80%

 

[PeSCaLo]

I wouldn't try to get more than 20a from a 20ah lifep04 battery. In any case, parallel bms should work. Just don't run at more than 80%

20C Means 20 Times its capacity, meaning its rated for 400 Amps Cont Discharge.

 

[TacomaJoe]

A 20Ah battery with a 400A discharge rate has 3 minutes of capacity. Not sure what practical use would be.

 

[PeSCaLo]

A 20Ah battery with a 400A discharge rate has 3 minutes of capacity. Not sure what practical use would be.

UPS is one example

 

[400bird]

I've never heard of Lifepo4 cells rated for 20c
Got a link or datasheet to share?

 

[TacomaJoe]

UPS is one example

3 minutes of backup power doesn't seem practical to me, barely enough time to find a flashlight. If you work the UPS idea backwards and want say 30 minutes of backup power, that equates to 10A discharge on the 20Ah battery.