3.2.6 80%, 60%, 40%, 20% Capacity Voltage Levels
This should be set to the cell’s voltage at each of the four indicated state of charge levels. This information
typically comes from the battery cell’s datasheet, which may may involve interpreting the discharge curve
graph. However, the recommended values in Appendix A may be used.
3.3 Balance Parameters
3.3.1 Start Voltage
The BMS will not begin its balancing routine until the cell voltage(s) are above this voltage. Typically this
parameter should be set towards the top of the battery’s voltage curve.
3.3.2 Delta to balance
The BMS will not balance unless the delta exceeds this level. Setting this value too coarse will result in
possible cell damage; setting this value too fine will result in the BMS dissipating considerable heat as it
attempts to equalize the cell voltages. Recall that the passive balancing circuit works by routing the excess
voltage into resistors within the BMS, which converts into heat. This value must be a compromise between
those two extremes. Please see the recommended values in Appendix A.
3.3.3 Balancer Enabled
The BMS will only perform its balancing routine if this option is enabled.
There are very few reasons why this would ever be turned off. We recommend to keep it enabled.
3.3.4 Balance only when Charging
When enabled, the balancing routine will only be performed when charging.
When disabled, the BMS will enter Static Balance mode, where it will balance when both charging and
discharging.
NOTE: Charging while balancing is usually more effective, because the cell delta is greatest at the top of the
charge. We recommend to keep this setting enabled.
3.4 Other Parameters / Features
3.4.1 Switch
When enabled, the discharge FET will be disabled when the optional external switch contact is open. This
external switch, if used, must be wired to the 2-pin JST-XH connector on the BMS (see Appendix D1.3).
When disabled, the external switch will not be monitored or read.
3.4.2 Load Detect
When enabled, you will need to disconnect the load after a short-circuit before the battery pack can be used
again.
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