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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 start-
er 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 to interrupt the positive connec-
tion.
The starter battery is charged by the alternator on the engine. 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 included in the standard supply. A high efficiency battery
charging unit can be ordered from WhisperPower 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 WBC Handy 70. A battery switch and a charger
are included in the battery installation kit (refer to 2.5).
3
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, fibreglass 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.
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. This will result in severe damage to the batteries within
a short time.
Disconnect the battery leads if electrical welding is to be carried
out, otherwise damage will be caused to the diodes of the alter-
nator.
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 gases.
1.5.5 AC power system (230 / 400 Volt)
Before working (installation) on the system read the
sections on safety in the user's manual.
M-SQ PRO 15/18 kVA
Marine Diesel Generator
Be sure that all electrical installations (including all safety sys-
tems) comply with all required regulations of the local authori-
ties. All electrical safety/shutdown and circuit breaking systems
have to be installed on board as the generating set itself cannot
be equipped with such equipment for every possible variation.
The vessel's power supply system should be suitable and safe for
the AC voltage which is applied and the power that will be gen-
erated. Special attention has to be paid on dividing the system in
branches which are fused individually.
It is absolutely essential that each and every circuit in the
on-board electrical system is properly installed by a qualified
electrician.
The M-SQ15 and M-SQ18 can be connected as a single phase
230 Volt generator by an arrangement of the wiring in double
DELTA. When the wires are arranged in STAR the output will be
230/400Volt.
Connected as a three phase 230/400 Volt generator, 3x400
Volt is available between the phases. At the same time 230 Volt is
available between every phase and neutral.
When applying 3 phases the installation should be laid out in
such a way that there is a reasonable balance of load between
the three phases.
To avoid problems with unbalanced loads one could apply a 400V
3 phase to 230 Volt single phase transformer.
1
FUSE
An input fuse (from the generating set to the system) should be
installed to protect the installed electrical system.
For the Whispers the maximum single phase current at 230V
is 87 Amps. Using three phases the fuses should be capable of
withstanding three times 29 Amps and mechanically connected.
The fuses must be of the slow reacting type. For electrical motors
connected to the system, a motor protection switch must be
installed.
2
GROUNDING
The AC alternator windings are not grounded. The housing of the
alternator and all other metal parts are grounded.
To make a connection between "neutral" and "ground" is neces-
sary as part of a specific insulation failure protection system.
Small pleasure craft in Europe (length up to 24 meter) is submit-
ted to The Recreational Craft Directive 94/25/EC. The guidelines
of this directive refer to (ISO 13297).
When the installation comply to this standard the "neutral" and
"ground" should be connected on the generating set by connect-
ing the blue (neutral) wire with the terminal on which the yellow/
green wire is connected.
A Ground Fault Circuit Interrupter (GFCI) or similar device must
be applied
13
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