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10•EN
PREREQUISITES
A dual battery system where a D250SA
together with a SMARTPASS 120 charges a
100–800Ah service battery. Current is supplied
from a solar panel and/or an alternator. The
starter battery is charged from an alternator.
It is advantageous to use this installation when:
• The alternator is not able to deliver the desired
charging voltage.
• The service battery capacity is greater than
100Ah.
• Parallel consumption takes place during
charging. By connecting the consumers to the
Output Consumers on the SMARTPASS 120,
the service battery will be able to charge wit-
hout parallel consumption and the consumers
will instead be supplied with current from the
alternator.
• The service battery shall be protected
against deep discharge. Connect non-critical
consumers to the Output Consumers on the
SMARTPASS 120. Connect critical consumers
directly to the service battery. SMARTPASS 120
does not in that case switch off the critical con-
sumers when the service battery is completely
discharged.
TIP 4
Connect the cabling from the starter and service
batteries respectively to the SMARTPASS 120
and not to the D250SA.
See also tips 1, 2 and 3.
SMARTPASS 120
+OUT
+OUT
+IN
SMARTPASS 120
+OUT
+OUT
+IN
PREREQUISITES
A dual battery system where there is a
230/110V charger and a D250SA that,
together with a SMARTPASS 120, charge a
service battery with a capacity of 150–800Ah.
Current is supplied from a solar panel and/or
an alternator to the service battery. The starter
battery is charged from an alternator.
It is advantageous to use this installation when:
• The charge from the alternator while it is char-
ging (engine running) is not enough, so it has to
be supplemented by a 230/110V charger.
• The alternator is not able to deliver the desired
charge voltage.
• The service battery capacity is greater than
150Ah.
• Parallel consumption while charging is taking
place. By connecting the consumers to the Output
Consumers on the SMARTPASS 120, the service
battery will be able to charge without parallel
consumption and the consumers will instead be
supplied with current from the alternator.
TIP 5
Connect a 230/110V charger to the starter
battery if it needs charging. In that case both
the starter and service batteries will be optimally
charged from the 230/110V charger.
TIP 6
Heavy current consumers (more than 80A) must
be connected directly to the service or starter
battery.
See also tips 1, 2, 3 and 4.
12V
RECOND
RECOND
NIGHT
NORMAL
MODE
5. Large service battery with parallel consumers 6. Connect an AC/DC charger
*
*
*
*
STARTER
BATTERY
STARTER
BATTERY
SERVICE
BATTERY
SERVICE
BATTERY
*See ”CABLE AND FUSE RECOMMENDATIONS”
*See ”CABLE AND FUSE RECOMMENDATIONS”
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