Bypass discharge current on BMS

[ChipP]

Hi,
I am new to the forum. I am working on an EV project and will have a number of 36v battery modules in series. Charging will be 5KW onboard through the Openinverter logic board (charger doesn't have a set voltage and needs to be told when to turn off). I would like to be able to hook up a device with voltage protection for charging only, not discharge current protection. I have low voltage protection/temp monitoring/balancing figured out. My packs will see upwards of 600 amps peak, and each cell group is capable of over 1000amps peak (a123 batteries in parallel). Is it possible to wire something like this for that:
12s Lifepo4 BMS

I was also thinking about wiring up one of these for each cell group and connecting to a relay to turn off the charger at a set voltage:
LED Digital Volt Meter Buzzer
That would require 120 of them though-about $250 for the lot.

Any help would be greatly apprciated!
Thanks,
Chip

 

[Portugaline]

Hello,

If you only want the battery protection on the charge side connect the charger to the negative coming out of the BMS and for discharge use the battery pack negative and ignore the BMS.

I would not recommend this because you can easily damage your cells on discharge.

 

[ChipP]

If I were to wire up 10 modules, each with its own bms , to an onboard charger that would need to be told when to turn off, would this work? Any suggestions on the best way to wire this up, or relays to use if needed? Thanks!