Electrical system
2-30
Charging system (F450A/FL450A/XF450)
Outline
To help meet the extreme electrical demands of today’s larger boats, the 450-horsepower models
now feature a new three-phase, simultaneous charging system that delivers more net amps and at
lower r/min, where it’s needed most.
Using Phase Angle Control (PAC), which adjusts the intensity of the stator’s magnetic field, the 450-
horsepower models produce of up to 96 net amps per engine at idle speed. Phase Angle Control
(PAC) uses crank position sensor signals and built-in semi-conductors to control the magnetic field
within the stator. This, paired with greater magnetism of the rotor, allows for increased output, espe-
cially at very low r/min.
Semi-conductors are now used in place of diodes to control output to the main and secondary
charging leads while prioritizing charging of the starting battery(ies).
The 450-horsepower models provides more power for today’s popular on-board, high-demand devic-
es like gyro stabilizers, air conditioning, sound systems, and more, all while keeping starting batteries
constantly charged.
Generator output and charging performance
110.0
(A)
100.0
90.0
80.0
70.0
60.0
50.0
0 2000 4000
A
B
6000 (r/min)
A
B
A. Generator output
B. Charge
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