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Chapter 5
TYPICAL BATTERIES
Marine batteries are described and rated by the following
terminology:
A.Battery cold cranking performance rating- The
discharged amperes( pressure in a circuit) that a battery at
0 degrees Fahrenheit can transfer in 30 seconds and still
maintain 1.2 volts per cell or higher.
B. Cranking performance- The discharge in ampres that a
new completely charged battery at 32 degrees Fahrenheit
can continually deliver for 30 seconds, and maintain a
voltage at the terminals of 1.2 volts or higher.
C. Battery reserve capacity- A number in minutes that a
completelly charged battery at 80 degrees Fahrenheit can
be continuously discharged at 25 ampres and hold a
voltage of 1.75 volts or higher per cell (10.5 volts for 12
volt marine battery).
Since your vessel’s battery system is one of the most
important on board systems, refer to the maintenance
section for proper battery servicing and storage procedures.
All battery terminals should contain a thin layer of anti-
corrosion grease encapsulating the entire terminal surface.
Battery electrolyte must be filled to the proper level to
ensure a longer battery life. All fastening hardware must
be kept tight to hold the batteries in place. Battery boots
(red) must cover the entire positive terminal to prevent
any possible arcing from tools, etc. Securely tighten all
battery connectors to their respective posts.
Direct current is stored in the ship’s wet cell batteries.
Twin engines use individual engine starting batteries. The
battery circuit uses an on/off type battery switch that
provides a positive battery disconnect, isolates all circuits
and aids in protection against electrical fire,explosion and
adds an extra security factor.
The dockside shorepower system through a battery
charging system takes the place of the engines alternator
to produce direct current.
The shore power cord sends 120/240 volts through the
battery charger and it is converted to direct current at
the battery charger. In this scenario the main D.C.
distribution panel battery converter switch/breaker needs
to be on for charging current to reach the batteries.
When replacing batteries make sure the correct size and
capacity are used. Always replace batteries in sets. Your
Regal dealer will be able to assist you in obtaining the
correct battery replacement. The factory normally
recommends 650 cold cranking wet cell ampre batteries.
Typical Twin Battery Installation
IN THE DIRECT CURRENT
(D.C) BATTERY SYSTEM
RED BATTERY CABLES ARE POSITIVE AND
BLACK BATTERY CABLES ARE NEGATIVE.
IN THIS SYSTEM
CORRECT POLARITY MUST BE OBSERVED
AT THE BATTERY TERMINALS WHERE THEY
ARE MARKED (+) FOR POSITIVE,
(-) FOR NEGATIVE.
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