Battery Requirements; Power Cable Sections (Battery To Relay) - MAX power COMPACT RETRACT 12 V Mechanical And Electrical Installation Manual

4.5

BATTERY REQUIREMENTS

POSITIVE:
To Relay
Positive Bar
Manua
Electric
Battery Battery
Isolator Isolator
NEGATIVE:
To A1 Terminal
on Motor Terminal
Busbar
When choosing the type of batteries needed for your thruster's battery bank, keep in mind
that it is the CCA (Cold Cranking Amps) capacity that is the most important and not the Ah
(Amp-hour) capacity. This is because thrusters draw high currents, but only for very short
periods of time (maximum 3 min.)
Max Power would recommend using Exide, Maxxima 900 type batteries, which have an
800CCA and 50Ah capacity.
If the dedicated batteries are charged by the alternator, the reference of the charge
must be taken after the diode-splitting block (if in doubt, consult a marine electrician).
If the batteries or cables are inferior to those recommended, the Compact Retract will not
reach its potential thrust. The greater the batteries and cables size, the better the thrust.
Thruster performances are quoted with a minimum 22 volts at the motor terminal busbar
for a 24 volts model or 11 for 12 volts models (thruster running, boat in water).
4.6 POWER CABLE SECTIONS ( BATTERIES TO RELAY )
According to the ISO 10133 standards: "The length and cross sectional area of conductors in
each circuit shall be such that the calculated voltage drop shall not exceed 10% of the
nominal battery voltage at any appliance if the circuit is switched on at full load".
The cable lengths as given in the table below are the total length of the positive cable
measured from battery bank to thruster relay, then the cable from thruster relay to terminal
D1 or D2 on thrusters motor terminal busbar plus the negative return cable from terminal A1
on terminal busbar to battery bank. Please refer to the diagram "Compact Retract, 12/24:
Power Cable Connections" in the back of this manual.
From battery to thruster (+) &
When choosing or calculating the cable size needed for your thruster installation, do not
forget to take into account the thermal rating of the conductor insulation which are directly
related to the ampacity (current carrying capacity) of the cable. Always try to use cables
with the highest thermal insulation rating available or at least 85° - 90°C.
16
Power
Fuse
l
Cable Lengths
back (-)
5 m (2 x 2.5m)
10 m (2 x 5.0m)
15 m (2 x 7.5m)
20 m (2 x 10m)
+
12 V
800 CCA
-
50 Ah
+
12 V
800 CCA
50 Ah
-
+
12 V
800 CCA
50 Ah
Compact Retract, 12V Compact Retract, 24V
mm²
AWG
70 mm²
2/0
95 mm²
3/0
120 mm²
4/0
120 mm²
4/0
- -
+
12 V
800 CCA
50 Ah
mm²
AWG
50 mm²
1
70 mm²
2/0
95 mm²
3/0
95 mm²
3/0