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Starter battery charging process (battery 1)
Parallel circuit
Driving operation
During driving operation, the starter battery (battery I) is charged by the gen-
erator of the vehicle. As long as the generator is running and there is a voltage
on the input D+ of the power supply, the supply battery and the starter battery
are in parallel operation. The supply battery is also charged by the generator. If
there is no voltage at the D+ input of the power supply, the parallel connection
is turned off if the voltage falls below 13,7 volt.
Mains operation (all voltage values with respect to a battery temperature of 20 °C)
When connecting to the mains of 230 volt, the supply battery is charged first.
Once the supply battery reaches a voltage of 14,1 volt, it is switched in parallel
with the starter battery. If the charging current rises to its rated value due to a
consumer and the battery voltage falls below 13,0 volt, then the parallel con-
nection is automatically disconnected. The starter battery thus always remains
ready to start.
Solar operation
When connecting external solar cells, the starter battery is also charged pro-
vided that the voltage of the supply battery has reached 14,1 volt. If the voltage
of the supply battery drops below 13,0 volt, the parallel circuit is disconnected
again.
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