Karmann-Mobil DEXTER 580 2021-2022, Operating Manual

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Electrical system
EN 47
7.10 Charge booster
Depending on the vehicle, the battery charger can be connected to a so-called “charge booster” (also
called “DC-DC Converter”). Its purpose is to charge the installed lithium battery (=living room battery B2)
quickly and efficiently.
The charge booster is located near the battery charger.
Charge booster (sample illustration)
7.11 Circuit breakers B1, B2 and heating
The circuit breakers B1 and B2 can be used to interrupt the current between starter battery B1 /
living room battery B2 and the connected consuming units, e.g. to prevent deep discharge if the vehicle
is not used for an extended period of time. A dedicated circuit breaker is provided for operating the
heating so only the heating can be supplied with power if required. Before the living room battery B2
is disconnected from the circuit, the control panel for the heating has to be switched off. (Also see
section 13 “Laying up for winter”.)
7.12 Charging the living room battery B2
If the voltage of the living room battery B2 has dropped below the critical value of 10.5 V, it has to be
charged. To do this, establish the connection to the 230 V power supply. (See item 7.4 “Establishing the
230 V power supply”.) The symbol “indicator light for battery charging with external cable” now lights up.
CAUTION
Risk of deep discharge of the batteries!
If you will not be using the vehicle for an extended period of time, disconnect the power
supply to the 12 V consuming units with the B1, B2 and heating circuit breakers.
Check the state of charge of the batteries regularly using the control panel.
If the voltage of the living room battery B2 drops below the critical value of 10.5 V,
the control panel is switched off automatically. In this case, interrupt the current flow
with the three circuit breakers B1, B2 and heating. Charge the battery within 2 days
using the external 230 V connection and the connected battery charger.