Victron energy MPPT 100/50 Handbuch Seite 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 100V, 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 24V battery, a reset (to 12V) occurs only when
output voltage decreases to less than 2V and voltage on the PV
input exceeds 7V. This may occur if the battery has been
disconnected before PV voltage starts to rise in the early
morning. When the (24V) battery is reconnected later during the
day, the system voltage is restored to 24V after 10 seconds if
the battery voltage exceeds 17,5V.
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.
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 or a 24V system (when connecting a 24V battery
with at least 17,5V).
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