2 Installation
SMA Solar Technology AG
18
STP60-JP-10-IA-en-11
Installation Manual
2.9 PV Connection
2.9.1 External PV Array Junction
Boxes
PV strings must be connected to the DC input via an external
PV array junction box. The PV array junction box connects
the PV strings of the PV array and protects the individual
strings against overcurrent with appropriate fuse protection.
The combined power from the PV array junction box must
be connected to the DC input of the inverter.
The DC power can be disconnected with the
inverter-integrated DC load-break switch.
Figure 2.21 Do not connect PV to ground!
Figure 2.22: DC connection area
INFORMATION
The same number and type of modules must be
connected to all PV strings connected to the PV array
junction box. In addition, all connected modules must
have the same orientation.
INFORMATION
Observe correct fuse rating. Consult the module
manufacturer's manuals for information on correct
string fuse rating.
INFORMATION
Use a suitable voltage detector that can measure up
to 1000 V DC. Verify the polarity and maximum
voltage of the PV arrays by measuring the PV
open-circuit voltage.
The inverter is protected against short-term reverse
polarity. Not correcting reverse polarity results in
irreparable defects of the inverter and will void the
warranty.
• Make sure that the cables are properly connected to
the inverter so that the inverter can feed in DC input
voltage.
PV array is floating, with both the (+) and (-) conductors
connected to the PV inputs of the inverter. Neither
conductor is connected to ground.
Do NOT connect PV to ground!
INFORMATION
Cables with multi-strand, fine-strand or extra
fine-strand conductors can be used for AC
connection (see figure 2.23). The cables must be
suitable for a temperature of at least 75°C.
When using fine-strand or extra fine-strand
conductors, bootlace ferrules must be used for the
connection.
