Victron energy SCC020050200 Manual página 7

24V battery and mono- or polycristalline panels
● Minimum number of cells in series: 72 (2x 12V panel in series
or 1x 24V panel).
● Maximum: 144 cells.
Remark: at low temperature the open circuit voltage of a 144
cell solar array may exceed 100 V, depending on local
conditions and cell specifications. In that case the number of
cells in series must be reduced.
3.3 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).
3.4 More about automatic battery voltage recognition
The system voltage is stored in non volatile memory.
In case of a 24 V battery, a reset (to 12 V) occurs only when
output voltage decreases to less than 2 V and voltage on the PV
input exceeds 7 V. This may occur if the battery has been
disconnected before PV voltage starts to rise in the early
morning. When the (24 V) battery is reconnected later during the
day, the system voltage is restored to 24 V after 10 seconds if
the battery voltage exceeds 17,5 V.
Automatic voltage recognition can be switched off and a fixed
12V or 24V system voltage can be set with a computer or a
Color Control panel.
Alternatively, the controller can be reset by short circuiting the
output and applying a voltage exceeding 7 V 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, or a 24V system (when connecting
a 24 V battery with at least 17,5 V).
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