Mastervolt Alpha 12/90 User Manual

INSTALLATION
EN / Alpha alternator - Alpha Pro regulator / June 2007 15
• For Alpha alternator models 12/90, 12/130,
24/75, 24/110 and 24/150: see figure 11
Mastervolt alternator models 12/90, 12/130, 24/75,
24/110 and 24/150 do not have a D+ connection.
Therefore Mastervolt offers a solid state relay that
can be used to simulate the charge lamp terminal
(D+). See figure 11. See APPENDIX for ordering
information.
Figure 11: Connection the solid state relay model
EM-1224
4.5.6 Use of a battery isolator (optional)
When two or more battery banks need to be charged
simultaneously, use of a battery isolator is
recommended. See figure 12 for installation details.
See APPENDIX figures A-11, A-13 and A-14 for
installation examples.
CAUTION!
If there is a battery isolator between the
B+ terminal of the alternator and the
positive (+) pole of the battery, both the
red [+bat] wire and the brown [reg on]
lines must be connected to the positive
(+) pole of the battery. Do not connect
these wires to the input of the battery
isolator.
NOTE!
As battery voltage sensing is performed
by the Alpha Pro regulator, you can use a
battery isolator that has no voltage sense
connection
Figure 12: Use of a battery isolator
+ –
AUXILIARY
BATTERIES
2A
10A
+ –
MAIN
BATTERIES
Negative busbar
B+
B–
S1
Ignition relay or oil
pressure switch
Battery fuse
ALTERNATOR
Field
connector
Battery Isolator
Temperature
sensor
reg on
gnd
+bat
field
Battery fuse
Solid state relay
Model EM-1224
Alternator
indication lamp
12 / 24V
Alternator
W terminal

Mastervolt Alpha 12/90 Specifications

General

Brand	Mastervolt
Model	Alpha 12/90
Category	Portable Generator
Language	English