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23
Systems
BATTERY CHARGERS
The following information covers the typical yacht 50
amp Chargemaster battery charger dedicated to the en-
gine cranking batteries located in the bilge. It is located
on the forward starboard side of the engine compart-
ment. The battery charger operates on 120 volt AC
power made available from the dockside shore power or
from the on board generator. The charger changes AC to
DC current internally to enable battery charging. When
the diesel engines are running the alternators produce
DC current to charge the batteries.
The cranking batteries are selectively charged through a set
of relays called DVSR’s located on the battery management
panel. They sense which batteries need a charge. The relay
circuit closes and sends a charge to the appropriate battery.
The battery charger features a set of dip switch settings to
enable different con
fi gurations. DIP switch #1 needs to
be set to the “on” position for AGM type batteries which
are out
fi tted as original equipment. If for some reason
the battery type changes and new types are installed the
dip switch settings on the battery charger need to be reset.
Never mix battery types such as AGM and lead acid types.
50 AMP MASS COMBI
CHARGER
DEDICATED TO
HOUSE BATTERY
50 AMP CHARGEMASTER
BATTERY CHARGER
DEDICATED TO
ENGINE CRANKING
BATTERIES
CHARGER
JUNCTION
BOX
The charger will function on AC voltage from 95 to 277
volts and either 50 or 60 hertz (cycles). The charger auto-
matically sets itself for the voltage available. This is help-
ful at docks that carry low voltage; it works down to 95
volts. It is also helpful in international markets where 230
volt 50 hertz voltage exists. On this vessel, the charger is
used as a 120 volt component not 240 volts. This battery
charger is fully automatic, microprocessor controlled and
is multi-staged to provide the most ef
fi cient service for
the customer.
The face of the battery charger displays status, battery
type and fault LED’s.
Periodically check the battery charger output current (DC
ammeter) to visually monitor the charging circuit. The
levels will vary depending where the system is as far as
recharging the batteries. This can also be accomplished
by choosing a source battery on the display and by select-
ing amps which will show a level at the load bar. See the
display illustration on the next page.
With a correct functioning charging system as the batteries
become charged the amp rate should diminish. Batteries
that are highly discharged will demand a greater initial
charge rate and the output meter may show on the high
side of the readout and slowly diminish as the battery over
time becomes fully charged. This is a normal condition.
Another way to check the battery charger output is at the
AC/DC panel. With all battery charger breakers “off ” the
volt meter should show around 12.5 volts. Energize sev-
eral breakers and
fl ip on the battery charger breaker. The
ship’s main panel volt meter should slowly begin to show
charging current above battery voltage levels.
The charger junction box serves as a relay and connection
point for battery charger wiring. See photo above.
BATTERY CHARGER SYSTEM OVERVIEW