I am thinking about building a battery pack 6S5P and since I don’t have a lot of experience I would like to ask the group how big of a BMS should I consider buying. I am using the Sk3 6364 245kv.
You should know however that when you bypass the bms during discharge cycle that your batteries will not have the same protection that they will if you do not bypass.
While the Vesc can monitor total pack voltage and shut down if it gets too low, It does not monitor cells or cell groups individually.
When you discharge through the bms, it monitors each cell or cell group’s voltage and if any cell or group drops to the detection voltage the bms shuts down. It will also protect your battery against shorts and over current.
So the optimum setup is to charge and discharge through the bms.