Marquis 720 FLY, Owner'S Manual

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ENGINE bATTERIES
Each propulsion engine has a designated pair of batteries connected to generate 24 volts DC . The engine batteries are located in the
center of the engine room between the engines . (See previous page for illustration)
A master disconnect switch controls the Electricity from each battery to the battery’s designated engine . The switches are located in
the engine room, aft bulkhead . Turn ON the master disconnect switches to provide electricity to the engines . (See the previous page
for illustration)
The engine battery pairs share electricity with one another . The third master disconnect switch labeled, Engine Battery Parallel con-
trols the flow of electricity between the two battery pairs . The master disconnect switch is located in the engine room on the PORT aft
bulkhead . The engines use electricity from both engine battery pairs when the master disconnect switch is turned ON . This is useful if
one engine battery fails: the engine can still be started by using electricity from the other engine’s battery pair .
Refer to Section 9: Engine Room for the exact location of the engine batteries .
bOW AND STERN THRUSTER bATTERIES
The thrusters use the same batteries as the engines . The bow thruster is powered by the PORT engine batteries; the stern thruster is
powered by the STDB engine batteries .
Electricity from each battery pair to the designated thruster is controlled by a master disconnect switch . The switches are located in
the engine room near the base of the aft PORT and STDB bulkheads . Turn ON the thruster’s master disconnect switch to provide
electricity to each thruster .
ACCESSORY bATTERY bANK
The accessory equipment is controlled by the three DC circuit breaker panels (DC Bus Distribution Panel, DC Distribution Panel, and
the Bridge Breaker Panel) . All three panels are powered by a bank of two batteries, connected to provide 24-volts DC .
The batteries
are located in the engine room at the base of the aft bulkhead . (See previous page for illustration)
Electricity from the batteries is controlled by a master disconnect switch . The switch is located in the engine room on the aft bulkhead .
Turn ON the master disconnect switch to provide electricity to the DC Bus Distribution Panel . Circuit breakers on the DC Bus
Distribution Panel control the flow of electricity to the other DC circuit breaker panels .
Refer to Section 9: Engine Room for the exact location of the Accessory batteries .
GENERATOR bATTERIES
The generator has a dedicated battery . Electricity from the battery to the generator starter is controlled by a master disconnect switch
(same as the battery disconnect on previous page) .
The switch is located in the engine room in the STDB bilge compartment . Turn
ON the master disconnect switch to provide electricity to the generator starter .
Refer to Section 9: Engine Room for the exact location of the Generator battery and dedicated master disconnect switch .
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A fully charged single 12 Volt battery that has not been charged or discharged for at least two hours should indicate between 12 .3 and
12 .6 volts . A fully charged 24 Volt battery pair that has not been charged or discharged for at least two hours should indicated a read-
ing between 26 - 28 Volts . A reading below 26 - 28 Volts indicated a partially charged battery .
ENGINE bATTERIES
The voltage level of each engine battery pair is determined by activating the battery’s dedicated voltmeter . The voltmeters are located
at each helm . For each engine, a single LCD display provides information on engine temperature, oil pressure, and battery voltage
level . To activate each engine’s voltmeter, turn the engine’s ignition key one position to the right .
NOTE: It is not necessary to start the engine to activate the fuel gauge . Refer to the OEM information for details on oper-
ating the engines .
Gauge Panel needs to be cycled to voltmeters and the engines at idle to indicate a correct running volt .