SMA STP 15000TL Installation - Manual (Page 39)

SMA Solar Technology AG Electrical Connection
Installation Manual STP20TLHE-IA-IEN122222 39
6.4.4 Connecting the PV Array (DC)
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 plant design and
the PV module circuitry. Otherwise, the maximum
inverter input voltage may be exceeded at low
ambient temperatures.
2. Check the strings for earth faults as described in
Section 11.1 "Checking the PV Array for Earth
Faults" (page 75).
DANGER!
Danger to life due to high voltages in the inverter
• Before connecting the PV array, ensure that the AC miniature circuit-breaker is
disconnected from all 3 line conductors and that it cannot be reconnected.
NOTICE!
Destruction of the inverter due to overvoltage
If the voltage of the PV modules exceeds the maximum input voltage of the inverter, it can
be destroyed by the overvoltage. This will void all warranty claims.
• Do not connect strings to the inverter that have an open-circuit voltage greater than
the maximum input voltage of the inverter.
• Check the plant design.
NOTICE!
Excessive voltages can destroy the measuring device
• Only use measuring devices with a DC input voltage range up to at least 1,000 V.