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Chapter 5, Electrical Systems, MJM 40z Owner’s Guide page 18
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 40z 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 8D, 245 amp-hour
HOUSE BATTERIES
• Two Group 31,105 amp-hour
PORT and STBD ENGINE BATTERIES
• One Group 27, 95 amp-hour
GENERATOR BATTERY
(if optional
generator is present)
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
1
2.
The NORTHERN LIGHTS GENERATOR (
option
)
120-volt AC power provides power for the
SEAKEEPER, COOKTOP,
MICROWAVE, TV, AIR CONDITIONING, WATER HEATER
and
OUTLET/RECEPTACLES
. There are SPARE BREAKERS that may be added
for other devices. A 20-amp circuit with a ground fault circuit interrupter
(GFCI)
outlet/receptacle ser ves the
AC OUTLET/RECEPTACALS
.
The
GENERATOR
and
SHORE POWER 1
provide power to the
INVERTER/CHARGER
that charges the batteries and provides power to the
120V AC circuits at the left side of the 120V breaker panel. SHORE
POWER 2 bypasses the
INVERTER/CHARGER and provides 120V AC directly
to the right side of the 120V breaker panel.
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.