Xantrex Technology Xantrex Battery Monitor - Manual (Page 12)

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For example, assume the discharge floor is set to 50%. Then the CEF
algorithm starts operating when 100% - 50% / 10 = 5% is discharged
from a fully charged battery. When the discharge floor is set to 0%,
this level is 100% - 0% / 10 = 10%.
Charged parameters
Based on increasing charge voltage and decreasing charge current, a
decision can be made whether the battery is fully charged. When the
battery voltage is above a certain level during a predefined time
while the charge current is below a certain level during the same
time, the battery can be considered as fully charged. These voltage
and current levels as well as the predefined time are called charged
parameters. In general for a 12 V lead acid battery, the voltage
charged parameter is 13.2 V and the current charged parameter is
2.0% of the total battery capacity (for example, 4 A with a 200 Ah
battery). A charged parameter time of 4 minutes is sufficient for
most battery systems. Please note that these parameters are very
important for correct operation of your Xantrex Battery Monitor,
and must be set appropriately in the corresponding Functions.
Synchronizing the Xantrex Battery Monitor
For a reliable readout of the state of charge of the battery, the battery
monitor has to be synchronized regularly with battery and charger.
This is accomplished by fully charging the battery. When the charger
is operating in the “float” stage, the charger considers the battery
full. At this moment the Xantrex Battery Monitor must consider the
battery as full too, so that the amp-hour counting can be reset to zero
and the state of charge reading set to 100.0%. By precisely adjusting
the charged parameters in the Xantrex Battery Monitor, the battery
monitor can automatically synchronize with the charger when the
“float” stage is reached. The range of the charged parameters is wide
enough to adjust the Xantrex Battery Monitor to most battery
charging methods.
When the Xantrex Battery Monitor cannot be adjusted to the
charging algorithm of the installed charger, the user can always
synchronize the battery monitor manually when the battery is fully
charged. This is realized by pressing both < and > selection keys
simultaneously for three seconds. By manually synchronizing the
battery monitor, the CEF will not be calculated automatically.
When the supply voltage of the Xantrex Battery Monitor
has been interrupted, the battery monitor must always be
synchronized in order to operate correctly.