5
ELECTRICAL SYSTEMS
AC and DC electricity can be lethal. Don’t work on the
boat’s electrical system if you aren’t a qualified marine electrician.
5.1
E
LECTRICAL
S
AFETY
Please read and understand the safety precautions in the included National
Marine Manufacturers Association (NMMA) publication, Sportfish, Cruisers,
Yachts: Owner’s Manual concerning electrical safety. For more reading,
there is Boatowner’s Mechanical and Electrical Manual by Nigel Calder and
Boat Owner’s Illustrated Electrical Handbook by Charlie Wing.
5.2
E
LECTRICAL
P
OWER
The MJM 3z includes both 12-volt direct current (DC) and 120-volt
alternating current (AC).
12-
Volt DC
Most of the boat’s electrical devices use 12V DC. It’s stored
in AGM absorbed-glass mat no-maintenance batteries as follows:
Two Group 4D, 220 amp-hour
HOUSE BATTERIES
Two Group 27, 66 amp -hour OPTIMA Blue-Top
PORT and
STBD ENGINE BATTERIES (the generator is started from the port
starting battery)
The Victron INVERTER/CHARGER
is factory set for AGM batteries.
Don’t try to open the batteries. Other than keeping them
charged, stored and clean (especially between the terminals), there’s no
maintenance required.
Don’t let the voltage fall below 12 volts. Sensitive electronics
may fail to function.
120-Volt AC
Two different sources can provide 120V AC to the
INVERTER/
CHARGER
to charge the batteries and provide power to the 120V AC circuits.
1.
SHORE POWER
2.
The 3.5kW Westerbeke generator (
option
)
120-volt AC power provides power for the
COOKTOP, MICROWAVE, TV, AIR
CONDITIONING, WATER HEATER
and
OUTLET/RECEPTACLES
. There are two GFCI
outlets on the boat, one in the galley and one in the head. They serve all
outlets downstream of the device so all outlets have GFCI protection. If an
outlet isnt working and the breaker is on, be sure to double check the GFCI
to make sure it has not tripped.
The
GENERATOR
and
SHORE POWER
provide power to the
INVERTER/CHARGER
that charges the batteries and provides power to the
120V AC circuits in the 120V breaker panel. When unplugged or the
generator is off, the inverter will only power the outlets, microwave, and
cook-top.
Only one
GFCI OUTLET/RECEPTACLE
is in the circuit with other non-GFCI
outlet/receptacles. If the
120-VOLT
BREAKER
on the electrical panel is on
and there is no power at the
AC
OUTLET
/
RECEPTACLES
, the circuit
interrupter may have tripped. Press
the reset button
on the
GFCI
OUTLET
/
RECEPTACLE
.
…R.I.J.
Summary of Contents for 3z
Page 1: ...3z OWNERS GUIDE ...
Page 13: ...2 10 EMERGENCY AND THRU HULL DIAGRAM ...
Page 28: ...5 9 GENERATOR COMPONENT LOCATIONS ...
Page 39: ...Engine maintenance and parameters See the Mercury operation and maintenance manual ...
Page 40: ......
Page 47: ...3Z Owner s Guide 9 11 SYSTEMS LOCATION PLAN ...
Page 49: ...3Z Owner s Guide 9 13 WIRING DIAGRAMS ...
Page 56: ......
Page 57: ......
Page 58: ...3Z Owner s Guide ...
Page 59: ......