6.3.8 MasterShunt connected to Alpha Pro
You can select a MasterShunt or an MLI Ultra battery in the MasterAdjust configuration menu. When this selection
is active the Alpha Pro receives important data from the battery via MasterBus. This will improve the charging
system and protects the battery by means of the following the data:
• Battery full determination
The MasterShunt or MLI Ultra battery measures the actual current that goes into the battery. When only a
small percentage of current is measured, the Alpha Pro considers the battery to be full and switches to the
float phase.
• Starting in Float
Thanks to the above-mentioned mechanism the Alpha Pro will start directly with float charging if the SOC is
100%.
• Use of the temperature sensor
The MasterShunt is installed closer to the battery than the alternator. The battery temperature sensor can now
be connected to the MasterShunt. The MasterShunt will pass the measured battery temperature on to the
Alpha Pro. This value is being used to compensate the charge voltage as described in Section 3.3.
• Compensation for the voltage losses
The Alpha Pro now uses the voltage of the MasterShunt to determine the voltage loss between the battery
and the alternator. The Alpha Pro will compensate for these losses by rising the charge voltage evenly. Cable
losses for MLI Ultra batteries are not compensated.
Note: The Alpha Pro uses both the shunt data and its own data (via Reg on) for determination of voltage losses.
Therefore, Mastervolt advises to mount the reg on wire (brown) as close to the battery as possible on the
load side of the fuse.
With a MasterShunt connected, the following is different in the use of the Alpha Pro:
• There are two options to place a temperature sensor. The MasterShunt temperature sensor is preferably placed
onto the battery, the optional sensor (Product code: 41500400) onto the alternator.
• Absorption Return Amp is added in the configuration. This is the charge current at which the regulator starts
the minimum absorption timer. This value is calculated from the MasterShunt Amp=Full percentage, multiplied
by its entered Battery capacity.
• The MasterShunt may have a battery voltage setting that differs from the Alpha Pro voltage setting. In this case
a MasterShunt Mismatch alarm is shown on MasterBus.
7 MAINTENANCE
During maintenance, the Safety Guidelines & Measures are applicable at all times. See section 1 of this manual.
No specific maintenance to the Alpha Pro charge regulator is required. Examine your electrical installation on a
regular basis, at least every six months. Defects such as loose connections, damaged wiring etc. must be corrected
immediately.
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