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6. BATTERY BANK SENSORS
7. 48V DC SYSTEM
7.1
Find a suitable place for the battery solenoid switch,
this should be on the positive battery cable as close to
the battery bank as is practical. Fix the battery switch
in place with appropriate fastenings. Further details
will be provided with the switch.
***Ensure that battery switch is in the off position***
***Do not connect at this time***
7.2
Find a suitable place for the positive and negative
busbars. Use different locations for each busbar. It
should not be possible to short with a spanner between
the two busbars whilst working on them.
7.3
Select the appropriate size cables for connecting
the battery bank with the busbar for the maximum
possible load. These will be detailed in the system
schematic. As mentioned previously, a high interrupt
capacity fuse AND an appropriately sized circuit
breaker should be fitted before the battery switch.
The fuse will protect the battery and the breaker will
protect the cabling.
***Always size cable appropriately***
7.4
Connect the 48V negative busbar to the boat’s
common grounding point with a suitably sized cable
(no less than 35mm
2
). If not already linked, also fit a
negative link between any 12V and 24V battery banks.
7.5
Run cables between the busbar and the battery
bank(s), but do not connect.
Important:
•
Always ensure the 48V system is isolated before working on it.
• Ensure a fuse/breaker is appropriately sized and sited (on the positive side) for every
reduction in cable cross-sectional area where the cable is in use.
• Label all cables at both ends.
6.1
Place the battery bank sensor over the sensor post
or battery bank cable.
6.2
The bank sensor loom will have between 3 and 6
cable ends depending on your chosen batteries and
the voltage of the bank. please refer to Annex D. The
twin core black cable with the non insulated terminal
on the end is the temperature tap. The black wire is 0V.
The remaining four red cables are voltage tap 1, 2, 3
and 4. If using a loom for the PC1800 batteries with the
copper busbars, tap 1 is the shortest and tap 4 the
longest. If using the non-specific battery loom, the
terminals will be labelled.
6.3
If using 4 x 12V batteries, use tap 1 for 12V
(from 0V tap), tap 2 for 24V, tap 3 for 36V and
tap 4 for 48V.
If using 24V batteries use tap 1 for 24V and tap
2 for 48V. If using a single 48V battery use tap 1 for
48V.
6.4
Fit the 0V tap at the point where the negative cable
leaves the battery bank.
6.5
Fit the positive voltage taps as shown in Annex D.
6.6
Re-fit and tighten all terminal fastenings and
torque to manufacturer’s specification.
