There has been discussion on the ideal setup where a BMS with an e-switch is used for discharging (turning on the board), BUT also where that same BMS supports charging the battery without turning on the board/switch.
It seems obvious, yet according to SuPower, such a configuration is not possible:
In this case, the discharging BMS essentially functions as a big anti-spark switch (edit: with OC protection h/t @SilentException). So @Jinra, if you’re bypassing the BMS discharging, I’m guessing you’re using a vedder or anti-spark switch?
why use a BMS for discharge at all then? Use a Vedder Switch to turn on your board if you want an “e-switch”.
@Maxid Cost.
Vedder switches cost upwards of $40-60 plus shipping, and you need buy a BMS.
With the two-BMS setup, the cost for both together is under <$55.
Output BMS also serves as LV and OC cut-off, not just glorified anti-spark switch
I’m talking about configuration from OP, and that should work just fine for the purpose. Would be a bit careful using cheap BMS even if just for charging. Balancing cells is an art
I’m been charging with dual Vescs on for months on 2 builds and it has caused no issues at all.
I feel its well worth it to have all the protection a BMS affords in discharge mode along with a dependable and convenient anti-spark solution.
I tried stand alone e-switches and they failed.
The e-switches in my Bestech bms’s have been rock solid.
@Namasaki Ah, can you clarify your setup?
Dual Bestech BMSs like the setup described in the original post?
Or are you using Bestech BMS + vedder/anti-spark switch?
