Victron energy MPPT 150/45-Tr Manual De Instrucciones página 9

efficiency: 144 cells (4x 12V panel or 2x 24V panel in series).
● Maximum: 216 cells (6x 12V or 3x 24V panel in series).
48V battery and mono- or polycristalline panels
● Minimum number of cells in series: 144
(4x 12V panel or 2x 24V panel in series).
● Maximum: 216 cells.
Remark: at low temperature the open circuit voltage of a 216
cell solar array may exceed 150V, depending on local conditions
and cell specifications. In that case the number of cells in series
must be reduced.
3.4 Cable connection sequence (see figure 1)
First: connect the battery.
Second: connect the solar array (when connected with reverse
polarity, the controller will heat up but will not charge the
battery).
3.5 More about automatic battery voltage recognition
The system voltage is stored in non volatile memory.
In case of a 24V or 48V battery, a reset (to 12V) occurs only
when the output voltage decreases to less than 2V and the
voltage on the PV input exceeds 7V. This may occur when the
battery has been disconnected before PV voltage starts to rise
in the early morning. When the (24V or 48V) battery is
reconnected later during the day, the system voltage is restored
to 24V resp. 48V after 10 seconds if the battery voltage exceeds
17,5V resp. 35V.
Automatic voltage recognition can be switched off and a fixed
12/24/36 or 48V system voltage can be set with the
VictronConnect app (see sect 3.9): recommended if the battery
is frequently disconnected from the controller.
The controller can be reset by short circuiting the output and
applying a voltage exceeding 7V on the input (for example with a
small power supply, or a solar panel) during a few seconds. After
a reset, the controller will automatically adjust itself to a 12V
system, a 24V system (when connecting a 24V battery with at
least 17,5V) or a 48V system (when connecting a 48V battery
with at least 35V).
The VictronConnect app (see sect. 3.9) is required to set the
MPPT to 36V.
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