Battery System
Explosive hydrogen gas is given off by charging batteries. Batteries will explode if an open flame
or spark ignites the hydrogen gas. Never use an open flame in the battery area. Do not strike
sparks near the batteries.
Working on engine starting circuits or alternators with battery cables connected can cause se-
vere injury or death. Battery cables should be disconnected from the batteries before working on
the engine starting circuits or the alternator.
If any circuit breaker should trip, do not activate the system until the cause of the malfunction
has been determined and corrected.
The DC electrical system is a 12VDC system and is composed of the following components:
•Batteries
•Battery Charging System
•Circuit Breakers
•Battery Distribution Panel
The batteries are normally charged through an engine-driven alternator or via a shore cord connected to
a battery charger. The number of batteries depends on the number of engines. There is a dedicated
battery for:
•The Port Engine (Figure 3-41).
•The Starboard Engine (Figure 3-42).
There is also a dedicated House battery for running electrical components. Access to the batteries is
attained by raising the engine hatch. (Figure 3-1 on Page 3-3).
3-18 3-18
Systems
Figure 3-41 Port Engine Battery Installation Figure 3-42 Starboard Engine Battery Installation
STBD
ENGINE
BATTERY
HOUSE
BATTERY
PORT
ENGINE
BATTERY
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