Victron energy Blue Power MPPT 150/35 Manuel page 8

3.3. PV configuration (also see the MPPT Excel sheet on our
website)
● Provide a means to disconnect all current-carrying conductors
of a photovoltaic power source from all other conductors in a
building or other structure.
● A switch, circuit breaker, or other device, either ac or dc, shall
not be installed in a grounded conductor if operation of that
switch, circuit breaker, or other device leaves the grounded
conductor in an ungrounded state while the system remains
energized.
● The controller will operate only if the PV voltage exceeds
battery voltage (Vbat).
● PV voltage must exceed Vbat + 5V for the controller to start.
Thereafter minimum PV voltage is Vbat + 1V.
● Maximum open circuit PV voltage: 150V.
The controller can be used with any PV configuration that
satisfies the three above mentioned conditions.
For example:
24V battery and mono- or polycristalline panels
● Minimum number of cells in series: 72 (2x 12V panel in series
or one 24V panel).
● Recommended number of cells for highest controller 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).
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