INSTALLATION
EN / Alpha alternator - Alpha Pro II regulator / January 2013
11
4 Loosely attach the alternator adjustment strap
(Figure 5 and 6: reference D) to the alternator
adjustment ear (figure 5, reference C) with the
bolt, lockwasher and flat washer.
5 Tighten the V-belt by applying pressure to the
alternator front housing only and tighten the bolt
to the adjustment ear (figure 5, reference C). Set
belt tension per belt manufacturer's
recommended specifications. If manufacturer's
specifications are not readily available, set V-belt
tension tight enough so that the V-belt on
alternator fan pulley will not slip when attempting
to rotate alternator by hand.
CAREFUL!
Alternator will be permanently damaged if
pressure is applied to rear housing.
Tighten the V-belt by pressing against
front casing near alternator fan.
6 Tighten all remaining alternator mounting bolts
and check all other bolts to secure the
installation.
4.5 ELECTRICAL CONNECTIONS
WARNING
Let installation work be done by a
licensed electrician. Before beginning
with the connection of the wiring, make
the DC distribution voltage free.
CAUTION!
Short circuiting or reversing polarity may
lead to serious damage to the batteries,
the alternator, the Alpha Pro II regulator,
the cabling and/or the terminal
connections. Fuses can not prevent
damage caused by reversed polarity. The
damage as a result of reverse polarity is
not covered by the warranty.
CAUTION!
Too-thin cables and/or loose connections
can cause dangerous overheating of the
cables and/or terminals. Therefore
tighten all connections well, in order to
limit transition resistance as far as
possible. Use cables of the correct size.
See specifications (section 9) for
recommended wire sizes.
• Use the supplied cable assembly for connection
of the Alpha Pro II regulator
• DC Cables to connect the Battery to the
alternator are not included in the delivery.
• The alternator wiring is electrically isolated from
ground.
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 be for a wet battery:
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
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