6.1
S
ECTION
6 • E
LECTRICAL
S
YSTEM
390 Sundancer
®
(
425 Sundancer
®
)
1. DC S
YSTEM
The 12 volt direct current (DC) electrical system
derives its power from the batteries, which are kept
charged by an engine-driven alternator and/or AC
converter. The battery voltage is indicated by the
voltmeter on the main distribution panel and control
station instrument panel. Each battery bank can be
checked with the battery voltage test switch on the
DC distribution panel or the voltmeters at the helm,
when the ignition is on. The batteries supply power
to the main DC breaker panel in the bilge. In turn,
this panel distributes power to the electronic fuse
block and the control station breaker panel at the
helm and to the DC distribution panel in the salon.
The 12 volt helm station and cockpit systems are
protected by the ELECTRONICS and CONTROL
STATION breakers on the main DC breaker panel
on the forward bulkhead of the bilge. The 12 volt
functions on the salon DC distribution panel are
protected by the “CABIN MAIN” breaker on the
main DC breaker panel.
The negative terminal of each bank of batteries is
attached to the main DC negative bus and the
negative studs of the propulsion engines and the
generator. This “negative ground system” is the
approved system for marine DC electrical systems.
2. B
ATTERIES
The batteries in your boat have been selected for
their ability to furnish starting power based on engine
and generator starting requirements as well as their
ability to supply power to the DC system.
The following table describes the recommended
marine cranking batteries to install in your boat.
M
AIN
E
NGINE
B
ATTERIES
(G
AS
)
(F
IG
. 6.1.1)
B
A
Application
Group Volts CCA*
Reserve
Qty.
Engines
27
12
600
155
4
*COLD CRANKING AMPS
Bow Thruster
31
12
800
200
2
FWD
F
E
D
C
H
G
J
I
MAIN DC NEGATIVE BUS
STBD ENGINE BATTERIES
PORT ENGINE BATTERIES
PORT ENGINE STARTER (POSITIVE)
PORT ENGINE NEGATIVE
MAIN BATTERY SOLENOID BOX
ENGINE TO ENGINE NEGATIVE
MAIN DC BREAKER PANEL BOX
STARBOARD ENGINE NEGATIVE
GENERATOR
ENGINE TO ENGINE NEGATIVE
STARBOARD ENGINE STARTER
(POSITIVE)
L
K
A
B
C
D
E
G
I
J
K
L
F
H
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