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8
The power supply
8.1
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 ma-
rine batteries; these can be supplied in the following sizes: 55 Ah,
70 Ah, 90 Ah, 108 Ah, 120 Ah, 143 Ah, 165 Ah, 200 Ah and 225 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 ca-
bles can then be short thus preventing voltage losses caused by long
cables.
Be sure to only use 'sealed' batteries if the batteries are locat-
ed in the same compartment as the bow thruster.
The Vetus 'SMF' and 'AGM' maintenance-free batteries are ideally
suited to this application.
Batteries that are not 'sealed' may produce small amounts of ex-
plosive gas during the charging cycle.
Sparks generated by the carbon brushes of the bow thruster
motor may ignite this explosive gas.
Always use batteries whose type and capacity are compatible for
their use.
In extreme cases, for example when a battery with a capacity of
five times or more than suggested is used, there is the danger
of causing permanent damage 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.
8.2
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 voltage sup-
plied, consult the table in your bow thruster installation and operat-
ing manual.
The maximum duration of engagement and the thrust, as
specified by the technical details in your bow thruster instal-
lation and operating manual, are based on the recommended
storage battery capacities and storage battery connection
cables.
If appreciably 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.
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8.3
Main Switch
A main switch must be included on the 'positive cable' .
A Vetus battery switch is a very suitable choice. Consult the following
table for the correct type of battery switch.
Art. code Vetus Battery Main Switch
Standard Thruster
BOW . . . .
12 Volt
25
35
45
BATSW250
55
60
75
95
BATSW600
125
160
—
220
—
285
48 Volt : BATSW600
BATSW250
The BATSW250 is also available with two poles, (Vetus art. code
BATSW250T).
Main switch with remote control
Instead of a storage battery main switch, a remotely controlled main
switch annex emergency stop can be installed.
This remotely controlled main switch is available for 12 or 24 Volt di-
rect voltages.
Vetus art. code: BPMAIN12 respectively BPMAIN24.
NOTE:
When using a series-parallel switch, the main switch must be suitable
for the voltage onboard.
Use a 12 Volt main switch if a 24 Volt bow thruster has been con-
nected in combination with a series-parallel switch to a 12 Volt on-
board network.
vetus® Installation recommendations for thrusters
'Extended Runtime'
Thruster
24 Volt
12 Volt
—
—
—
—
—
—
—
—
BATSW250
—
—
BATSW600
—
—
BATSW600
—
—
BATSW600
24 Volt
—
—
—
—
—
—
—
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