15
F11 : Battery temperature. In this Function the average battery
temperature can be adjusted. The value
AU
enables the
automatic temperature measurement provided that an
external temperature sensor is connected to the BMV-501.
Also the temperature readout in normal mode is enabled.
When
AU
is selected and the connection with the temperature
sensor is lost, four dashes (- - - -) are displayed and the
internal temperature compensation calculations are made
using the default
20
°
C
value.
Default : 20
°
C
Range : 0 – 50 / AU
Stepsize : 1
°
C
F12 : Temperature coefficient. This is the percentage the battery
capacity changes with temperature. The unit of this value is
‘%cap/
°
C’ or percent capacity per degree Celsius. The default
setting is
0.5
%cap/
°
C, typical for most batteries. The setting
OFF
disables temperature compensation.
Default : 0.5 %cap/
°
C
Range : OFF / 0.05 – 0.95 %cap/
°
C
Stepsize : 0.05 %cap/
°
C
F13 : Time-to-go averaging period. Specifies the time window in
minutes that the moving averaging filter works with. Selecting
the right time depends on your installation. A value of
0
disables the filter and gives you instantaneous (real-time)
readout, however the displayed values may fluctuate heavily.
Selecting the highest time (
12
minutes) ensures that long
term load fluctuations are included in the time-to-go
calculations.
Default : 3 minutes
Range : 0 / 3 / 6 / 9 / 12 minutes
F14 : Current threshold. When the current measured falls below this
value it will be considered as zero Amps. With this function it
is possible to cancel out very small currents that can
negatively affect long term state-of-charge readout in noisy
environments. For example if an actual long term current is
+0.05A and due to injected noise or small offsets the battery
monitor measures –0.05A, on the long term the BMV-501 can
incorrectly indicate that the battery needs recharging. When in
this case Function 14 is set to
0.1
, the BMV-501 calculates