John Frum
Tell me your problems
- Joined
- Nov 30, 2019
- Messages
- 15,233
Opening the fet path with significant current is pretty stressful for the fets.There are lots of parameters on the BMS you could change to stop charging , for example the low temperature charge disable, set this to a high value, the pack maximum voltage to a low value and so on.
I suggest a more practical method would to leave the BMS alone and use a power relay or isolating switch in the charge path to the battery.
Mike
Also Its my understanding that the upstream voltage can spike.