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The power supply
Choice of battery
The total battery capacity must be sufficient for the size of the
bow thruster; see the table. We recommend Vetus maintenance
free marine batteries; these can be supplied in the following
sizes: 55 Ah, 70 Ah, 108 Ah, 143 Ah and 165 Ah.
We also recommend that each bow thruster is powered by its
own separate battery or batteries. This allows the battery bank
to be placed as close as possible to the bow thruster; the main
power cables can then be short thus preventing voltage losses
caused by long cables.
Always use batteries whose type and capacity are compatible
for their use.
Main power cables (battery cables)
The minimum diameter must be sufficient for the bow thruster in
use and the voltage drop must not be more than 10% of the volt-
age supplied; see the table.
A main switch and fuse must be fitted in the 'plus' cable. A Vetus
battery switch is suitable here. The fuse protects the bow
thruster against overvoltage and at the same time protects the
vessel's wiring against short-circuits.
Fuse
A suitable fuse is available for the bow thruster, see table. We
can also supply suitable fuse holders for all fuses, Vetus art.
code: ZEHC100.
Bow thruster
Battery capacity
80 kgf 12 V
1 x approx. 200 Ah - 12 V
80 kgf 24 V
2 x approx. 100 Ah - 12 V
1
) Series connected.
16
2.0525
Total length of plus-
required
and minus cable
1
)
The maximum operating time and the thrust as speci-
fied in the technical details are based on the recom-
mended battery capacity and the battery connection
cables, see the 'Installation instructions'. If apprecia-
bly larger batteries in combination with very short
connection cables with appreciably larger diameter
than recommended are used then the thrust will
increase. In such cases the maximum operating time
must be reduced in order to prevent damage to the
motor.
In extreme cases, for example when a battery with a
capacity of five times or more than suggested is used,
it is possible the break pin will break (too) quickly.
There is also the danger of causing permanent dam-
age to one or more of the following shaft connections:
- The connection between motor shaft and the tail
piece input shaft.
- The connection between the tail piece output shaft
and the propeller.
Cable
cross-section 'slow blow' Vetus art. code
0 - 11 m
120 mm
0 - 38 ft
250kCM
0 - 19 m
50 mm
0 - 84 ft
AWG 0
Operation manual and installation instructions Bow thruster 80 kgf, ø 185 mm
IMPORTANT!
Fuse
2
355 A
2
160 A
ZE 355
ZE 160
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