Mastervolt ChargeMaster Plus 12/35-3

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ChargeMaster Plus 12/35-3, 12/50-3, 24/20-3, 24/30-3 – User and Installation Manual
discharged, the battery type, the ambient
temperature, etc. With a flooded battery this
stage lasts approx. 4h, with gel and AGM around
3h. Once the battery is 100% full, the
ChargeMaster Plus automatically switches over
to the FLOAT phase. In FLOAT, the ChargeMaster
Plus switches to a stabilized 13.25V/26.5V
(Flooded), 13.8V/27.6V (Gel/AGM) or 13.5V/27V
(MLI) at 25°C/77°F.
Connected DC loads are powered directly by the
charger. If the load exceeds the charger
capacity, the required additional power comes
from the battery, which will be progressively
discharged until the charger automatically
switches back to the bulk phase. Once
consumption decreases, the charger goes back
to normal operation of the 3-step charge system.
As the ChargeMaster Plus is equipped with a 3-
step+ charge system, the batteries can also
remain connected to the ChargeMaster Plus
during winter. One hour every 14 days the
charger automatically switches to absorption to
keep the battery running properly and prolong its
life span. The three-step plus charge system is
also safe for all the connected equipment. See
also Figure 9 on page 31.
5.4.1 Charge voltages
Bulk
Absorption
Float
AGM or
GEL
14.25 /
28.5
14.25 /
28.5
13.80 /
27.6
Flooded
14.25 /
28.5
14.25 /
28.5
13.25 /
26.5
Lithium-ion
14.00 /
28.0
14.00 /
28.0
13.50 /
27.0
5.4.2 Pre-float
The ChargeMaster Plus can automatically switch
each individual output from absorption to pre-
float stage. Pre-float ensures batteries that are
nearly full don’t receive the higher charge
voltage needed in the absorption stage. This
prevents over-charging, extending the lifespan of
the batteries.
5.4.3 Temperature compensated charging
By installing the battery temperature sensor, the
charge voltages are automatically adapted for
deviating temperatures.
Charge voltage (V)
Battery temperature (°C)
Figure 7: Temperature compensated charging
When the battery temperature is low, the charge
voltage increases. On the other hand, when the
battery temperature is high, the charge voltage
is decreased. Overcharge and gassing are
prevented this way. This will extend the life of
your batteries.
5.4.4 Flat battery support
The ChargeMaster Plus automatically detects a
flat battery and will initiate the flat battery charge
curve described in the following table.
UBat
Voltage
Output power
12V
24V
0.00V – 2.50V
0.00V – 5.00V
15%-30% of I
max
12V
24V
2.50V – 8.00V
5.00V – 16.00V
25% of I
max
12V
24V
8.00V – 10.00V
16.00V – 20.00V
linear from 25% -
100% of I
max
12V
24V
10.00V – 14.25V
20.00V – 28.50V
100% of I
max
12V
24V
>14.25
>28.50
Limited by P
max
5.5 DC OUT
The ChargeMaster Plus is equipped with three
full outputs; DC 1 OUT, DC 2 OUT and DC 3 OUT. The
total output current is divided over these three
outputs. All batteries are charged with the same
settings. See section 3.6 for connections.
5.6 Maintenance
No specific maintenance to the ChargeMaster
Plus is required. Examine your electrical
installation on a regular basis, at least once a
year. Defects such as loose connections, dam-
aged wiring etc. must be corrected immediately.
If necessary, use a soft clean cloth to clean
enclosure of the ChargeMaster Plus. Do not use
any liquids or corrosive substances, such as
solvents, alcohol, petrol or abrasive components.