INSTALLATION
12 June 2007 / Alpha alternator - Alpha Pro regulator / EN
4.5.1 Battery capacity
Make sure that the alternator has the right capacity
to charge the batteries and to supply the load that is
connected to the batteries while charging. Failure to
do so may result in extended charging times,
increased alternator temperatures, and finally a
reduced lifetime of your alternator and your
batteries. The ratio between alternator capacity and
battery capacity should as follows:
Type of vessel Ratio between alternator
capacity and battery capacity
Motor boat 20 – 40%
Sailing boat 30 – 50%
For example: on a sailing boat an alternator type
24/75 is suitable for charging a 24V battery bank of
150-250Ah (with no load connected).
Note that all above recommendations are given as
example only. Choosing the correct alternator /
battery capacity depends on many factors such as
daily engine running hours, load connected to the
batteries during charging, other charging equipment,
etcetera Therefore Mastervolt strongly advises to
make an energy balance for the entire electrical
installation.
4.5.2 Installation drawings
NOTE!
From the text below is often referred to a
reference. These references are shown
in the installation drawings of the loose
supplied APPENDIX. Keep the
APPENDIX on hand during installation
• For Alpha alternator model 12/90: see
APPENDIX figure A-6
• For Alpha alternator models 12/130, 24/75 and
24/110: see APPENDIX figure A-7
• For Alpha alternator model 24/150: see
APPENDIX figure A-8
• For Alpha alternator model 24/95C: see
APPENDIX figure A-9
4.5.3 Wiring instructions
1 See reference 1. Run the DC-cables between
the battery set and the alternator. A DC-fuse
must be integrated in the positive cable (see
section 8 for specifications). Do not install the
DC-fuse of the DC-distribution before the entire
installation is completed. Connect the red cable
between the B+ terminal of the alternator and
the positive (+) pole of the battery. Connect the
black cable between the B– terminal of the
alternator and the negative (–) pole of the
battery.
2 See reference d. Connect the black wire of the
cable harness between the [gnd] terminal of the
Alpha Pro regulator and the B– terminal of the
alternator
3 Insert the two pole connector of the cable
harness into the field connector of the alternator
See reference e. Take adequate measures to
assure a strain relief for this connector
4 See reference f. Connect the red wire of the
cable harness between the [+bat] terminal of the
Alpha Pro regulator and the positive (+) pole of
the battery or the B+ terminal of the alternator
NOTE!
If a battery isolator is used to charge
more than one battery, the red wire of the
cable loom should not be connected to
the B+ terminal of the alternator but to
the positive (+) pole of the battery
instead. See section 4.5.6.
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