Hobby OPTIMA ONTOUR EDITION 2019 Manual page 141

140 7. Electrical Installations
Operating and charging the ancillary battery
If the motor home is not connected to the 230V mains supply,
the ancillary battery will supply the electrical system with 12V
DC voltage. Since the battery only has a limited capacity, the
electrical devices should not be operated for a longer period
of time without charging the battery or connecting the camper
to the 230 V mains connection. Some electrical devices con-
tinuously use standby current from the ancillary battery. This
discharges the ancillary battery.
The battery is charged from three possible input sources:
- the generator when the motor is running
- the charger Dometic PerfectCharge SMP439
- if available, via a solar panel*
Intelligent Battery Sensor (IBS)
Battery Sensor
(optional for Optima Ontour Edition model)
An Intelligent Battery Sensor (IBS) has been connected to the
battery terminal. It measures and monitors the actual current,
actual voltage and temperature of the batteries in a highly
precise manner. Normally, the battery sensors are calibrated
automatically. To calibrate the battery sensor manually, please
follow the instructions in Chapter 7.3 Battery Management.
If there is a loss of power in the battery sensor (voltage
absent), you must recalibrate.
It is possible to determine the remaining operating time of the
battery based on the current consumption. The IBS ensures
that the battery will be changed in good time and assists in
providing active energy management so that the performance