Tiara Yachts C49, Owner'S Manual

Page: 44 / 152

Section 4 Electrical Systems
4-2
43 LS
the battery chargers. The battery chargers are
located in the mechanical space.
It is important that your batteries be kept in a
state of full charge as much as possible. Fully
charged 12V batteries will indicate a voltage
in excess of 12.6 volts with no load, or while
being charged. Consult the DC voltmeter on
the DC distribution panel
(in the starboard
cabin upper electrical cabinet) or the helm
MFD to check battery voltage.
Prolonged periods of discharge will cause
the batteries to deteriorate rapidly, and will
result in their inability to hold a charge for the
expected amount of time. This can happen
easily if excessive DC loads (such as lights)
are left on while the battery charger is off.
At dockside, when the boat is connected to
shore power, the battery chargers maintain
the charge on the engine and house bat-
teries. When operating the generator, the
engine and house battery chargers must be
on to maintain charge to the batteries.
Leave your boat connected to shore power
with the battery chargers ON when leaving
for any extended period of time. To do so, be
sure the BATTERY CHARGER switches on
both the Master DC Panel (in the mechanical
space) and the AC distribution panel
(in the
starboard cabin upper electrical cabinet) are
ON.
Automatic Charging Relay (ACR)
Your Tiara Yacht is equipped with an auto-
matic charging relay (ACR). The ACR box
is installed near the Master DC Panel in the
mechanical space.
The ACR automatically parallels (combines)
battery banks during charging, and isolates
them when charging has stopped and battery
voltage has fallen. The ACR allows temporary
isolation of house loads from the engine cir-
cuit during engine cranking, in order to protect
sensitive electronics. It is intended to keep
a load from discharging both of the battery
banks. The LED light on the ACR box indi -
cates when batteries are combined. See the
automatic charging relay owner’s manual for
more information.
Automatic charging relay box (typical)
DC Distribution
Power from each engine battery supplies the
respective red engine battery switch (STBD,
CENTER, PORT) on the Master DC Panel,
located in the mechanical space. A circuit
breaker on each engine protects the engine
ignition systems and gauges. Refer to the
engine owner’s manual for information about
your engines. The red main engine battery
switches may be controlled remotely by the
PORT BATTERY, CENTER BATTERY (if
installed), and STBD BATTERY buttons on
the DC distribution panel, located
in the star-
board cabin upper electrical cabinet.
Power from the house batteries supplies the
red HOUSE battery switch, which may be
controlled remotely by the HOUSE BATTERY
button on the DC distribution panel. Battery
switches and breakers on the DC distribution
panel protect the switch panels on the helm.
When the red main battery switches on the
Master DC Panel are in the OFF position, all
DC power to the rest of the boat (including
the high water alarm) is disconnected. The
only exceptions are the forward, mid, and
aft automatic bilge pumps . Shutting OFF the
red main battery switches will not disconnect
power to bilge pumps.