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3.3.5
Connection of PV panels cables
It is possible to connect one or two independent strings of panels.
Some PV panels that need a pole connected to earthing (for example the ones with amorphous technology, etc..)
are not suitable for the present storage system.
Danger of death from electrocution!
When the strings of photovoltaic panels are exposed to light, the cables
connected to them and to the storage system are live (up to 550 Vdc).
ATTENTION
Electrocution risk. Use insulating gloves and carpet foreseen for works done on hazardous electrical
components.
Before starting with the connection procedure, do the following checks on the electrical cables that come down from
the PV panels:
•
Check with a tester that on each line (string) is available a current lower than 550 Vdc.
•
Check with a tester the right polarity of the cables (red cable = pole “+”; black cable = pole “
-
“).
•
Insulate the cable tract that will be connected to the connector type MC4 (Picture 26 e Picture 27).
•
Before starting the installation of the connector MC4, check with a tester that the potential difference
between the cable that is going to be connected and the Pe protective conductor of the electrical installation
is equal to 0 V.
