Nice setup guys!
If im doing same on my boat i will use the BMS as switch off only for charging/discharging when propulsion system is off then use BMS only as alarm when propulsion is ON.
Only put a big and very common rotative switch A, A+B, B, OFF switch :
- bms service wire on A (automatic disconnect by bms)
- LifePo4 gnd on B (manually switched ON)
- EV motor controller on common
Then put an alarm to surveil the GND presence in A, the user will catch an alarm when the bms triggered a low cell voltage but keep the ability to slow down the power on EV propulsion, safer! No need to buy a monster bms that handle inductive load at 400A
Just my 2ct
If im doing same on my boat i will use the BMS as switch off only for charging/discharging when propulsion system is off then use BMS only as alarm when propulsion is ON.
Only put a big and very common rotative switch A, A+B, B, OFF switch :
- bms service wire on A (automatic disconnect by bms)
- LifePo4 gnd on B (manually switched ON)
- EV motor controller on common
Then put an alarm to surveil the GND presence in A, the user will catch an alarm when the bms triggered a low cell voltage but keep the ability to slow down the power on EV propulsion, safer! No need to buy a monster bms that handle inductive load at 400A
Just my 2ct