SMA STP 10000TL-10 Installation - Manual (Page 41)

SMA Solar Technology AG 6 Electrical Connection
Installation Manual STP10-17TL-IA-en-32 41
1. Check the connection cables of the PV modules for
correct polarity and make sure that the maximum
input voltage of the inverter is not exceeded.
At an ambient temperature over 10°C, the
open-circuit voltage of the PV modules should not
exceed 90% of the maximum input voltage of the
inverter. If this is not the case, review the system
design and the PV module circuitry.
Otherwise, the maximum inverter input voltage may be exceeded at low ambient temperatures.
2. Check strings for earth faults (see Section 12.2 "Checking the PV Array for Earth Faults",
page 83).
3. Check the Electronic Solar Switch for wear, as
described in Section 10.3. Providing it is in perfect
condition, plug the Electronic Solar Switch in right
up to the stop. The Electronic Solar Switch must be
aligned parallel to and flush with the enclosure.
Only plug the Electronic Solar Switch during
installation when the enclosure lid is open.
This is necessary in order to activate the protective
function of the integrated electronic string fuse.
Risk of fire in the PV array due to non-recognition of reverse currents
The integrated electronic string fuse monitors the PV array and protects it against dangerous reverse
currents. In order to activate the electronic string fuse, you must observe the following during
connection of the strings:
• If more than two strings are connected to the inverter, ALWAYS connect the first string to
input B. If no string is connected at input B, the string fuse will not be active.
• Each string must be clearly assigned to the correct string input. Do not cross-wire or bundle the
string cables. See the diagram in Section 6.4.1 for the correct assignment of the strings.
Use of external string collection boxes
If string collection boxes are used, the functionality of the electronic string fuse may be limited.