Hobby OPTIMA ONTOUR EDITION 2019 Manual page 143

142 7. Electrical Installations
The battery charger is directly connected to the ancillary battery
so that the ancillary battery can be charged via the 230V mains
supply even if the battery circuit breaker is switched on.
The battery sensor continues to be activated even if the
battery circuit breaker has been opened.
To keep the batteries charged even when not in use, it is manda-
tory that the vehicle be connected to a 230V mains connection
every 6 weeks. Recharging should be carried out for at least
24 hours.
The battery circuit breaker must be on when using the
vehicle home and whilst driving.
When the circuit breaker is open, the electrical input stage
will not engage automatically.
If the battery circuit breaker has been switched on for a
longer period of time, you may lose your customised radio
and/or sat nav device settings. These settings must then
be entered again.
Battery charger
Charger Dometic PerfectCharge SMP 439
The charger supplies the batteries with electric power.
During this process, the existing cooling system runs passively;
the fan is not active.
If the charging currents to the two batteries are high for a re-
latively long period of time, the charging current to the starter
battery will be reduced and limited via an electronic current
limiter. As a result, the ancillary battery will be charged first.
Should the battery sensor measure a battery temperature of over
52°C, the control will interrupt the charging process to prevent
the battery from being overcharged.