Battery installation
3-17
Battery installation
• Make sure to connect the battery properly and select the proper cable sizes. Otherwise, a fire
could result.
• If an optional isolator lead is installed and connected to a house battery, overcurrent protec-
tion in compliance with ABYC (E-11) or equivalent must be provided.
• Do not reverse the battery connections. Otherwise, the charging system could be damaged.
• Route the positive battery cable and negative battery cable next to each other.
• For excess portions of the battery cables, do not coil the cables more than is necessary.
• Always take care to never reverse battery connections. The rectifier/regulator itself is protected from
damage by solid state semiconductors within the system, however other systems on the engine and
on the boat may contain fuses or can be damaged by reverse polarity.
• Wiring the starting battery to the 450-horsepower models are no different that 400-horsepower
models. While Yamaha can not make recommendations about competitive engines wiring, most tra-
ditional wiring designs will work without issues with the 450-horsepower models. If using the isolator
lead, please ensure that the wiring can handle the additional current that can be provided by the 450-
horsepower models.
• The motor cannot start using only the secondary charging lead. The current required to start the 450-
horsepower models would exceed the 200-amp breaker capacity.
• A 200-amp breaker is required when using the isolator lead. The Simultaneous Charging function
has a much greater output than the 400-horsepower models when large current draws are placed
on the house battery bank. This breaker is required to ensure that systems attached to the isolator
lead do not exceed the rated capacity.
The increased charging output and the Simultaneous Charging function brings new options to inte-
grating the 450-horsepower models into the electronics of a boat’s power system.
To ensure that maximum performance is achieved, some simple guidelines should be followed.
Only the main output is used. Additional battery banks are connected with VSR’s. This ensures priority
charging of the starter battery (see Fig.1).
Main and isolator outputs are used. Additional battery banks are connected with VSR’s. This ensures
priority charging of the starter battery (see Fig.2 and Fig.3).
To function properly, the main and isolator leads must be in direct connection with the battery bank
to be charged. Diode-based or other isolator systems inline will prevent the charging system from
“seeing” the battery voltage of the house battery bank(s) and in that condition will not provide charging
amperage to that lead (see Fig.4).
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