7
7
VoltAbsorb= 3.500 V
: Normally LFP cells are fully charged at 3.6-3.65 V. Some chargers miss settings
adopted for LFP, so they will not manage to get the voltage that high. Then you can set an
“absorption” level that it can reach, and the let it stay there for a time. Here this time starts at 3.5 V.
TimeAbsorb= 1200 s
: and this timer will keep the charger on for 1200 s (20 min) before charging is
stopped
VoltHigh= 3.600 V
: All charging sources that can achieve 3.6 V will be stopped at that voltage. 3.6 V
corresponds to approximately 90 % SoC when charging is done with 0.4 C, and is a good compromise
between battery usage and battery life length.
TimeHigh= 5 s
: but the first cell must exceed the set voltage in more than 5 s before the action is
taken.
TimeChargeoff= 280/14400 s
: the total time it will be switched off is 14400 s (4 hours) and so far it
has been switched off for 280 s. If it is set to 65500 it means it will never switch on charging, then it
is only VoltResumecharg that will do that.
VoltResumecharg= 3.200 V:
if the voltage drops down to this level, charging will resume even if
TimeChargeoff has not elapsed.
TimeWarning= 120 s
: if the voltage has not gone down below the set high voltage 120 s after
charging has been switched off, BMS4S will start beeping “high voltage”.
The fifth block of lines describes battery temperature limits.
Templow1= 5 C
: if charging is started with battery temperature lower that this a “low temperature
charging” will start beeping, and charging will be stopped for a preset time (see command tc). If you
do not have any temperature sensors installed on the batteries, their temperature will be reported
as 20 degrees.
Tempwarn2= 50 C
: if battery temperature exceeds 50 degrees Celsius a “high battery temperature”
will start beeping.
Temphi3= 60 C
: if battery temperature exceeds 60 degrees Celsius a charging will be switched off for
a preset time (see command tc).
The sixth block of lines describes when and what to do when the alternators temperature is
getting high.
Temptarget4= 95 C
: when the alternator exceeds 95 degrees Celsius, BMS4S will regulate down
charging current and keep the temperature around 95. However, the temperature is a slow feedback
on how much power the alternator generates, so the temperature will fluctuate a bit around the set
value. Therefore, it is important to set a max-value (
Temphi5
) where charging will pause if the
regulation is too slow. This regulation will only work if your alternator has a voltage sense cable, and
you have installed a temperature sensor on the alternator.
Temphi5= 100 C
: when the alternator temperature exceeds 100 degrees Celsius, all charging will
pause. This will only work if you have installed a temperature sensor on the alternator.
