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INSTALLATION
Fig. 19: Connection for emergency stop / fire alarm switch
4
STARTER BATTERY
For starting, the Whisper requires a 12V starter battery
with the following capacity:
Model
Minimum capacity
M-SC3.5
55Ah
The generating set can be connected with the main engine
battery or have its own battery. We strongly recommend
the use of a separate battery for the generating set and to
keep the wiring system for the propulsion engine and the
domestic DC supply system completely separate and
individually connected to separate batteries.
Figure 20: Installation of a starter battery
However, the negative of all the batteries on the vessel
should be interconnected (when on earth) to avoid
difference in the voltage level of the earth on different
places causing trouble to electronic devices which might
be in the system.
The above recommendation is not valid for ships having
the starter battery of the propulsion engine or other
auxiliary equipment positive grounded. When this is the
case an expert should be consulted.
A battery switch may be used.
The starter battery is charged by the standard internal
charger in the alternator. An additional battery charger will
help to keep the battery in good condition when the
generating set is not used. A battery charger is not
14
included in the standard supply. A high efficiency battery
charging unit can be ordered from Mastervolt which is able
to charge both the ship's main battery and the starter
battery. Also a small charger can be used to charge the
starter battery only, such as the IVO SMART 12/10.
5 OTHER RECOMMENDATIONS AND WARNINGS
The battery should be secured for seagoing conditions and
the terminals should be insulated. For extra safety the
battery can be enclosed in a wooden, plastic, Fiberglas
etc. (non metal) box. Even when the earth return system is
applied a negative battery cable should be used and the
vessel should not to be used as a conductor.
In the negative battery cable a 250 Amp starter battery
switch could be applied to switch off the battery. The
battery cables are supplied in a standard length of 1.5 m, if
longer cables are required a larger cross sectional area
should be considered to compensate for voltage reduction.
When two batteries are used in series to provide a 24 Volt
supply system, never take off 12 Volt (starting) power from
one of these batteries (figure 21). This will result in severe
damage to the batteries within a short time.
Figure 21
Disconnect the battery leads if electrical welding is to be
carried out, otherwise damage will be caused to the diodes
of the alternator.
As explosive hydrogen gases are discharged
during charging, the battery should be located
in a well ventilated room. Ensure that the
supplied battery cable connectors are properly
fitted and never remove during or shortly after
charging as sparking can occur, which may
ignite the hydrogen gasses.
1.4.5
AC power system (230 Volt)
Before working (installation) on the system
read the sections on safety in the users
manual.
Be sure that all electrical installations (including all safety
systems) comply with all required regulations of the local
September 2010 / M-SC3.5 / EN
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