SMA SB 2500TL-21 Installation - Manual (Page 39)

SMA Solar Technology AG Electrical Connection
Installation Manual SB25-30TLST-21-IA-en-13 39
6.4.4 Connecting the PV Array (DC)
1. Check the connection cable 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 above 10°C, the open-
circuit voltage of the PV modules must not be more
than 90% of the maximum inverter input voltage. If
this is not the case, review the plant design and the
PV module circuitry. At lower ambient
temperatures, the maximum input voltage of the
inverter could otherwise be exceeded.
2. Check strings for earth faults (see Section 11.5 "Checking the PV Array for Earth Faults" (page 76)).
DANGER!
Danger to life due to high voltages in the inverter
• Before connecting the PV array, make sure that the miniature circuit-breaker is
disconnected and cannot be reconnected.
NOTICE!
Excessive voltages can destroy the multimeter
• Only use multimeters with a DC input voltage range up to at least 1,000 V.
NOTICE!
Destruction of the inverter due to overvoltage
If the voltage of the PV modules exceeds the maximum input voltage of the inverter, it could
be destroyed by the overvoltage. This will void all warranty claims.
• Do not connect any strings to the inverter which have an open-circuit voltage greater
than the maximum input voltage of the inverter.
• Check the plant design.
DANGER!
Danger to life due to electric shock.
• Do not connect any strings in which earth faults are present.
• Before connecting the DC cable, rectify the earth fault in the respective string.