DkubusEV wrote: ↑Sun Sep 18, 2022 3:58 am
wouldn't it be safer to not require the "main contactors" to be energised?
I'd always ensure your BMS has the direct possibility to open the charger contactor in case of an emergency.
In my V1 high voltage design I had the following setup:
- Aux devices (DC/DC, aircon, heater) on in charge and discharge mode
- Inverter only energized in drive/discharge mode
- Charger only connected in charge mode
Now in my V2 high voltage design I do it a bit different:
- In discharge mode, aux devices on and inverter as well
- Charge mode = discharge mode + charger contactor
So now I also energize the inverter in charge mode (which is (ideally) not needed, but simplifies other things.
And in charge mode the BMS can open the charger contactor independently of whatever the DC contactors do.