Baserunner V6 User Manual
Rev0
6.4 Battery Limits
Basic Setup tab
With motor and PAS sensor configured, you may also want to set the battery
voltage and current settings to appropriate values for your particular pack.
6.4.1 Battery Current Limits
Set “Max Battery Current” to a value that is equal to or less than the battery’s
discharge current rating. If unsure of this, a value of 2C or twice the amp-hour
capacity is a reasonable guess. So a 12 amp-hour battery should support a 24 A
max discharge, a 15 Ah battery should support a 30 A discharge etc. Higher
battery currents will result in more power, but can also stress the battery cells,
resulting in shorter battery life. Excessively high values can cause the BMS
circuit to trip, abruptly shutting down the pack.
If you are setting up a system with regenerative braking and have a BMS circuit
that shuts off if it detects excessive charge current, you will also need to further
limit the “Maximum Regen Battery Current” to a value lower than the BMS trip
current.
Otherwise it's not usually an issue with modern lithium cells to have short
duration peak regen current levels of 2C, ie double the battery amp-hours. A high
regen battery current limit is recommended to get full regen braking force at all
speeds. Do not set the maximum regen current to the limit recommended for the
charging port of the battery (eg. 5 amps) as that will result in a very
underwhelming braking force at all but the slowest speeds.
6.4.2 Battery Voltage Limits
In addition to the battery current limits, the controller can further limit discharging
when the pack is low or regen charging when it is fully charged.
We recommend setting “Max Regen Voltage (Start)” to the same value as the full
charge voltage of your battery, with the “Max Regen Voltage (End)” to about 0.5V
higher than that. This will ensure you can do regen even with a mostly charged
battery.
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