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EN
PREREQUISITES
A dual battery system where the D250T,
together with SMARTPASS 120T, will charge
the service battery when the vehicle motor is
running. and It will also manage available
power from the alternator to both the service
battery and parallel consumers.
This installation will give a system that both can
manage large parallel loads and at the same
time charge maintain the service battery, with
the optimum voltage for a 24V dual battery
system. The battery charging will be more
efficient and shorter as we are getting access to
a higher current initially, parallel consumers will
be powered directly from alternator.
Use this installation when:
– Large electrical consumers parallel to service
battery need power when the motor is
running.
– Need onboard charging and maintenance of
the service battery.
– Large service battery capacity (up to 800 Ah).
– A safe and reliable onboard charging and
power management system is required.
An AC/DC battery charger can be connected to
the service battery as complement to D250T and
SMARTPASS 120T. This can be useful if:
• Power from the alternator, when the engine
is running, is not enough to fully charge the
service battery. Additional charge is needed
to fill the battery up to 100%.
• Maintenance charging of the service battery
(and starter battery) during long time storage
of vehicle. The AC/DC charger will ensure
that the batteries are fully charged when the
vehicle should be used again.
• You will have access to AC power at your
destination. The AC/DC charger will charge
the battery and act as power supply for
connected consumers.
• Select the size of AC/DC battery charger
suitable for the size of the battery and all
consumers that are active whilst charging. For
example: A 10A charger will not charge a
battery at all if you have a 10A light turned
on.
Tips: If the starter battery needs charging, it
is possible to connect the AC/DC charger
to the starter battery and the D250T and
SMARTPASS 120T will charge and maintain to
the service battery in at the same time.
3. Large service battery with parallel consumers
4. Connect an AC/DC charger
*See ”CABLE AND FUSE REQUIREMENTS”
*See ”CABLE AND FUSE REQUIREMENTS”
STARTER
BATTERY
STARTER
BATTERY
SERVICE
BATTERY
SERVICE
BATTERY
STARTER
BATTERY
STARTER
BATTERY
SERVICE
BATTERY
SERVICE
BATTERY
Initially high current directly from
alternator, when current drops to
10A D250T will continue charging
according to charge algorithm.
I
t
Max. 100A
Max. 100A
