All sections of the ABYC E-11 should be followed on your boat at all times. You can get a copy from there web site for a 150 bucks or something like that. The Sections that cover your question would be below, basically you need a fuse or circuit breaker rated for the size of wire you are using. Also you should not run the voltage for your motor through a key switch but use a solenoid. A battery connector would not hurt, but would also no provide over current protection. Run not walk to the local marine store and buy some form of over current fuse for your bank if you do not already have one.
11.12.1. FOR DC SYSTEMS
11.12.1.1. Battery Charging Sources
11.12.1.1.1. Each ungrounded conductor
connected to a battery charger, alternator, or other
charging source, shall be provided with overcurrent
protection within a distance of seven inches (175mm)
of the point of connection to the DC electrical system
or to the battery.
EXCEPTIONS: 1. If the conductor is connected
directly to the battery terminal and is contained
throughout its entire distance in a sheath or
enclosure such as a conduit, junction box, control
box or enclosed panel, the overcurrent protection
shall be placed as close as practicable to the battery,
but not to exceed 72 inches (1.83m).
11.12.1.3. Motors or motor operated Equipment -
Motors and motor operated equipment, except for
engine cranking motors, shall be protected internally
at the equipment, or by branch circuit overcurrent
protection devices suitable for motor current. The
protection provided shall preclude a fire hazard if the
circuit, as installed, is energized for seven hours under
any conditions of overload, including locked rotor.
NOTES: 1. It may be necessary to use thermally
responsive protection devices on the equipment or
system if the motor is not capable of operating
continuously at maximum possible loading.
2. It may be necessary to test as installed in order to
assure compliance with the locked rotor requirement.
Voltage drop, due to wire size, and delay
characteristics of the overcurrent protection device
may have to be adjusted to protect the motor.
11.12.1.5.1. Each ungrounded conductor of a
branch circuit shall be provided with overcurrent
protection at the point of connection to the main
switchboard unless the main circuit breaker or fuse
provides such protection.
11.12.1.5.2. Each fuse or trip-free circuit
breaker shall be rated in accordance with E-11.12.1.3
and E-11.12.1.4 and shall not exceed 150 percent of
the conductor ampacity in TABLE IV . (See FIGURE
15.)
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