diy solar

diy solar

BYD vs Brand new 280AH cell, INTERNAL RESISTANCE

jasonhc73

Cat herder, and dog toy tosser.
Joined
Oct 1, 2019
Messages
1,921
Location
Wichita, Kansas
0.253 - 0.256 Ω IR - Brand new 280 AH Cells.
Screenshot_20210122-232530.jpg 20210122_232550.jpg
Old BYD packs using the external connector to measure IR. More than likely if you connect directly to the cell ends there is less IR.
2021-01-22.png IMG_20200202_224251718.jpg

These are 2 amp balancers.
On the new cells with very little IR the balancer can be set at 2 amps and has zero issues.
On the BYD very used cells with IR all over the place (4 to 6 times what new cells have), the balancer simply refuses to operate at 2 amps. It has to be throttled down to only have 1 amp max before it will consistently work.

The new cells were only 10 mV out of balance. Set at 2 amps balancing, it took less than 12 minutes to bring the pack of eight to 5 mV balance.
 
Back
Top