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Charging process
The Module B has electronic protection against polarity inversion. The charging
current is only released once the battery is correctly connected and a minimum
voltage of 1.5 volt is applied. The charging process follows the charging
characteristic curve, with minimal energy loss (for the charging characteristic
curve, Fig. 2). The charging process is done by using the temperature sensor for
the supply battery dependent on temperature.
Main charging phase
(all voltage values with respect to a battery temperature of 20 °C)
Charging with maximum constant charging current until the battery reaches
14.4 volts. If the charging current drops below 90 % of the rated current during
this phase due to the internal resistance of the battery and cable resistance, the
post charging phase is started.
Post charging phase
(all voltage values with respect to a battery temperature of 20 °C)
The charging voltage is kept constant at 14.4 volts for ten or four hours for gel
batteries and liquid electrolyte batteries, respectively. After this time, the device
switches to the charge phase. If during this phase the current rises above 90 %
of the rated current while the battery voltage drops below 13.2 volts for a period
of 15 minutes for liquid electrolyte batteries, or for more than two hours for gel
batteries, then the device switches back to the main charging phase.
Holding charge phase
(all voltage values with respect to a battery temperature of 20 °C)
The charging voltage is set to 13.8 volts. At the same time, the charging current
drops to the value necessary for the equalising charge of the battery. If the
charging current rises to its rated value due to a user and the battery voltage
remains below 13.2 volts for at least two minutes, then the device switches
back to the main charging phase.
Buffer operation
If during the post charging or holding charge phase, current is consumed, it is
recharged immediately.
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