7
7
VoltBalance= 3.500 V: There are two ways to use the built-in balancer. Both uses this value as the
starting point when the balancing procedures are initiated. This value shall normally not be set
below 3.4 V. If you do not activate the balancer, these settings will be used to calculate how big the
unbalance is.
VoltDifference= 0.000 V: This is the first and simplest balancing alternative. If this value is set
(recommended value: 0.050 V) then when the first cell has passed the BalanceVolt-value (during
charging) and the voltage difference between two cells exceeds the VoltDifference-value the
balancing will start and proceed as long as the BalanceVolt-value is exceeded and the unbalance
remains. But since the balancing current is low (0.2 A) and that balancing is done only while
charging, this method only works when the battery bank is reasonable well matched (all cells have
close capacity values). Otherwise, the second method is recommended.
When you activate any kind of balancing BMS4S will check that balancing not will cause too much
voltage drop due to too narrow wires. If you get the result ”bad voltage sense cables!” it is
recommended to increase the dimension or shorten the voltage sense cables.
BalanceInit= 0.000 Ah: This is the second balancing alternative. When the first cell passes
BalanceVolt-value during charging (and VoltDifference is set to 0.000) coulomb counting starts and
continues until the last cell passes it. If the difference between the best and the worse cell then
exceeds the BalanceInit-value (recommended value: 0.5% of the total battery capacity, i.e. 0.500 Ah
for a 100 Ah battery bank) the balancing will start and continue until the calculated balancing value
is balanced away. It is recommended that you have installed a way to measure the current if you use
this method. See chapter “Equipment connection description” how to do that. Note: VoltDifference
must be set to 0 (vd=0) in order to activate this balancing alternative. It is also important that the
charging current is similar when all cells passes the BalanceVolt-value since the measurement
otherwise might be misleading. I.e. do not set the BalanceVolt-value close to where the charging
device starts to decrease the charging-current.
You can see the coulomb counters with the sort Coulomb (As) with command po, and all calculated
results presented in Ah with command pe. You can use this information to manually balance the
cells with a 3.6 V charger.
When you activate any kind of balancing BMS4S will check that balancing not will cause too much
voltage drop due to too narrow wires. If you get the result ”bad voltage sense cables!” it is
recommended to increase the dimension or shorten the voltage sense cables.
BalanceAmount= 0 %: when balancing starts, it will aim to reduce the difference with the
percentage stated here. The recommended start value 25% is to ensure that it does not overshoot
the target. This is especially important if no shunt is connected, since it then bases the coulomb
counting on what value is set for BatteryCharging. If you find multiple similar entries in the “extreme
point log” (command pe) before an unbalance is cured, you can increase this with e.g. 25% to speed
up the process.
The third block of lines describes how and when a low voltage event shall be handled, i.e. when
shall the loads be disconnected.
StartLedblinking= 20 %: when SoC gets below 20% the LED will start blinking as an early warning, 2
blink for 10-19 % and 1 blink for 0-9 %. Affects the LED output port.
